Mergers

and

Acquisitions 2021 Handbook

The most up to date information is now available on our website www.nadoa.org

© 2021 by The National Association of Division Order Analysts NADOA does not guarantee the accuracy of the information contained herein.

2021 Company Merger and Acquisitions Handbook

NADOA Officers and Board 2021

President……….……...…….….………..…….……..…Lewis Box

1st Vice President……...... …….…...... ……Michele Lawton

2nd Vice President………..……..….…….…..... April Luedecke

Treasurer………………….….……..Michelle Harris-Fairclough

Corresponding Secretary…….….….…...……..Vicki Danielson

Recording Secretary…………….….…...…….. Maryann Maimo

Board Advisor………….….………………..…... Luanne Johnson

Director-CAPDOA………………....…...……….....Valerie Wibble

Director-DALWORTH...... Kimberly Bowman

Director-DADOA...... Stan Vargas

Director-HADOA...... Stephanie Nguyen

Director-PBADOA...... Jennifer Oden

Director-SADOA...... Joe Anderson

Handbook Information The Royalty Owner Relations section of this handbook lists names, addresses & telephone numbers for participating companies. The back section of the handbook lists all companies in alphabetical order in the left column of the page. The current company to contact is in the right column an asterisk (*) following a company name in- dicates a property sale rather than a merger or reorganization.

Update Process Please furnish a complete listing of any new name or address changes applicable to your company. Complete the form on the previous page and return to the email address listed.

UPDATES

NADOA Company Mergers and Acquisitions

Please email completed form to [email protected]

Date: ______

From: ______

Name Title Company

______

Address City State Zip

Phone: ____ - _____ - ______ext. ______

Fax: ____ - _____ - ______Email: ______

TYPE OF UPDATE

[ ] Personal Change [ ] Address Change [ ] Phone/Fax Update [ ] Other

[ ] Merger [ ] Acquisition [ ] Company Name change

Updates will be made exactly as they appear on this form. Attach additional sheet if necessary.

Company Contacts

Name Title Contact Information ______

Mergers & Acquisitions and/or Old Company Name & New Company Name

Past Contact (lower case) PRESENT COMPANY (UPPER CASE) Old Company (lower case) NEW COMPANY NAME (UPPER CASE) ______

National Association of Division Order Analysts

PO Box 1656 Palm Harbor, FL 34682

www.nadoa.org

Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

1400 Corporation AMERICAN EXPLORATION COMPANY 3 TEC Energy Corp PLAINS E & P CO. 3300 Corporation AMERICAN EXPLORATION COMPANY 3 TECH Energy Corp PXP GULF COAST, INC. 44 Canyon, LLC CHEVRON MIDCONTINENT, LP 4700 Corp AMERICAN EXPLORATION COMPANY 500 Corporation 1987 AMERICAN EXPLORATION COMPANY 820 Management Trust 820 MT O&G TX (WY)(LA)(MULTI-STATE) A & J Oil Co. NELSON R THOMAS A & K Petroleum 1957 KERR-MCGEE CORP A & K Petroleum 1957 DEVON ENERGY A.E. Acquistion Corp. see Dominion Exploration & Production AA Development Corp. 1984 AA ENERGY CORP (AMR ENERGY Abaca Oil Co. 1963* see Dominion Exploration & Production Abbeville Operating Corp. D.C. BINTLIFF ABCO Energy Corp. 1983 TEJAS OIL & GAS CO ABEL & BANCROFT Aberdeen Petroleum 1975 DEVON ENERGY Aberdeen Petroleum Corp. 1976 DEVON ENERGY Abney Oil Co. 1980 P. & O. FALCO, INC ABARTA Oil & Gas Co TALISMAN ENERGY USA INC ABTEC Chemical Company 1980 TOTAL E&P USA INC Acadia Petroleum Corp. FOUNTAIN OIL & GAS, INC. Access Energy Corp YAHKEE GAS CO. Acrol Oil Co. 1966 JAMES DONOGHUE Ada Oil Corporation 1983* TOTAL E&P USA INC ADA Resources 1979 ADAMS RESOURCES & ENERGY, INC. ADAMS RESOURCES & ENERGY, INC. Adams Resources Exploration Corp. ADAMS RESOURCES & ENERGY, INC. Addington Brothers Mining Co. 1976 ASHLAND OIL INC. Adena Exploration Inc. WASHITA PRODUCTION CO. Adobe Gas Cos. APACHE CORP Adobe Gas Pipeline APACHE CORP Adobe Oil & Gas Corp. 1985 DEVON ENERGY Adobe Oil Co. 1977 DEVON ENERGY Adobe Resources Corp. DEVON ENERGY Adobe Royalty, Inc. DEVON ENERGY ADVANTAGE OIL & GAS, LTD. AEC (Alberta Energy Co., Ltd) ENCANA CORP. AEC Gas Company see Dominion Exploration & Production AEC Gathering Services (USA), Inc. ENCANA GATHERING SERVICES (USA)

6 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

AEC Gulf of Mexico, Inc. ENCANA GULF OF MEXICO, INC. AEC International (USA) Inc. ENCANA INTERNATIONAL (USA) INC. AEC Marketing (USA) Inc. ENCANA MARKETING (USA) INC. AEC Oil & Gas (USA) Inc. ENCANA OIL & GAS (USA) INC. AEC Oil & Gas Co. Partnership ENCANA OIL & GAS PARTNERSHIP AEC Oil & Gas Co., Ltd. ENCANA OIL & GAS CO. LTD AEC Pipelines (USA) Inc. ENCANA PIPELINES (USA) INC AEC Pipelines, Ltd ENCANA PIPELINES, LTD AEC Storage & Hub Services, Inc. ENCANA GAS STORAGE INC. AEC West Ltd. ENCANA WEST LTD AERA ENERGY, LLC Aetna Oil Co. 1950 STATOIL ENERGY INC Agate Petroleum Inc. ST. MARY LAND & EXLORATION CO. AGM Incorporated MAXUS EXPLORATION AGS INVESTMENTS LLC managed by AVIVA AGS LIMITED PARTNERSHIP managed by AVIVA Aikman Brothers, TX Partnership Aikman Brothers, LLC Aikman Petroleum, Inc 1983 * ENERTEC CORP. Air Pilot Oil HESS COMPANIES AJA Resources ADAMS RESOURCES & ENERGY Alamco, Inc. CHESAPEAKE ENERGY CORP. Alameda Energy, Inc. SLAWSON EXPLORATION COMPANY, Alamo Oil & Gas, Ltd. GLOBAL NATURAL RESOURCES CORP. Alamo Petroleum FARMLAND INDUSTRIES, INC. Alamo Petroleum Co. ANADARKO E&P COMPANY, LP Alaska Interstate Co. 1982 UNIMAR CORP. Alberta Energy Co., Ltd. (AEC, Ltd.) ENCANA CORP. Alco Oil & Gas 1969 ANADARKO E&P COMPANY, LP Alcorn Oil Co 1929 CONOCOPHILLIPS Alder Oil Co. 1946 NEWMONT OIL CO. Alene Oil Co. 1989 TENKAY RESOURCES, INC. Alexander Energy Corp. SANDRIDGE ENERGY, INC. Allegheny Land & Mineral 1983 ALAMCO INC. Allegro Petroleum, Inc. NORTHSTAR RESOURCES, INC. Allen Oil Co. ANADARKO E&P COMPANY, LP ALLIANCE PETROLEUM CORP. Allied Ashland STATOIL ENERGY INC Allied Chemical CONOCOPHILLIPS Allied Chemical Corp CONOCOPHILLIPS Allied Oil Co. ASHLAND OIL INC. Allied Oil Co. 1948 ASHLAND OIL & REFINING CO.

7 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Alma Oil Co. 1915 Shell Oil Co. Alminex LTD CANADIAN SUPERIOR Alpar Resources PLAINS EXPLORATION & PRODUCTION Alpar Resources Inc. 1981 ANADARKO E&P COMPANY, LP Alta Energy Corp. DEVON ENERGY CORP. Alta Natural Resources, LLC SILVER CREEK RESOURCES, LLC Altair Oil & Gas Co. 1964 PIONEER NATURAL RESOURCES USA, Altura Energy OCCIDENTAL PERMIAN, LP Amalgamated Bonanza Petro 1979 CHEVRON CORP Amarex, Inc. CALPINE NATURAL GAS, LP Amarex, Inc. 1985 TGX CORP. (Templeton Energy) Amarillo Minerals, Inc. 1970 PIONEER NUCLEAR, INC. Amarillo Oil Co. PIONEER NATURAL RESOURCES USA, Amarillo Oil Co. 1986 PIONEER NATURAL RESOURCES USA, Amax Oil & Gas, Inc. ANADARKO E & P CO. Amax Petroleum Corp. ANADARKO E & P CO. Ambassador Oil Corp. 1965 ANADARKO PETROLEUM CORPORA- AMBRIT ENERGY CORP. Amcan Oil Corp 1970 CONOCOPHILLIPS Amcan Oil Corp. 1952 LARIO OIL & GAS CO. Amcog Acquisition Corp. see Dominion Exploration & Production Amdel Inc. 1977 TOTAL E&P USA INC Amerac Energy Corp. UNIT CORP. Amerada Hess Corp. HESS CORPORATION Amerada Petroleum Corp. 1969 HESS CORPORATION American Agricultural Chemical CONOCOPHILLIPS American Cometra Inc. RANGE RESOURCES INC. American Corporate Resources, Inc. CONOCOPHILLIPS AMERICAN ENERGY EXPLORATION American Exploration Acquisition Co. see Dominion Exploration & Production American Exploration Acquisition - VI Corp. see Dominion Exploration & Production American Exploration Co. (Houston) see Dominion Exploration & Production American Exploration Gas Systems Corp. see Dominion Exploration & Production American Exploration Operating Co. see Dominion Exploration & Production American Exploration Production Co. see Dominion Exploration & Production American Independent Oil Co. 1970 CONOCOPHILLIPS American Liberty Oil Co. TOTAL E&P USA INC American Liberty Oil Co. 1957 TOTAL E&P USA INC American Maracaibo FELMONT OIL CORP. American Maracaibo Co. 1958 FELMONT OIL CORP. American Metal Co. (LTD) ANADARKO E & P CO.

8 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

American Monertra, Inc. AVENEG, INC American National Petroleum Company PATRICK PETROLEUM CO. American Nat'l Gas Production SANDRIDGE ENERGY, INC. American Natural Energy Corp. SANDRIDGE ENERGY, INC. American Natural Gas Production Co. EL PASO E&P COMPANY, LP American Net Profits Partnership - VII Ltd. see Dominion Exploration & Production American Oil Co 1961 BP AMERICA American Oil Co. of Texas 1952 EXXON MOBIL CORP. American Pacific International 1979 PETRO LEWIS CORP. American Pacific, Int'l (API) HESS CORPORATION American Petrofina Co. of Texas 1985 TOTAL E&P USA INC American Petrofina Expl. Co. 1994 TOTAL E&P USA INC American Petrofina Foundation 1990 TOTAL E&P USA INC American Petrofina Marketing Inc. 1985 TOTAL E&P USA INC American Petrofina Pipeline Company ALON USA LP American Petrofina, Inc. 1991 TOTAL E&P USA INC American Petroleum HESS CORPORATION American Producing Properties Co. see Dominion Exploration & Production American Production Partnership LTD II, etc see Dominion Exploration & Production American Quasar Petroleum Co. 1987 UNIT CORP. CO. American Republic Corp. 1954 BP AMERICA American Reserve Corporation see Dominion Exploration & Production AMERICAN RESOURCES INC. American Royalty Trust 1987 FREEPORT-MCMORAN ENERGY PTNRS Ameriplor Corp. see Dominion Exploration & Production Ameritrus Petroleum Corporation JP MORGAN CHASE & CO Ameritrust Texas, N.A. JP MORGAN CHASE & CO Amerox Acquisition Corp. see Dominion Exploration & Production Amex 1980, Ltd. see Dominion Exploration & Production Amex 1981, Ltd. see Dominion Exploration & Production Amex 1982, Ltd. see Dominion Exploration & Production Amex 1983, Ltd. see Dominion Exploration & Production Amex Oil Company see Dominion Exploration & Production Amex Production Partnership Ltd. see Dominion Exploration & Production Amherst Coal Co. 1981 MAXUS ENERGY CO. Aminoil Dev. Inc. BURMAH OIL & GAS CO. Aminoil USA Inc. 1984 CONOCOPHILLIPS Amkam Acquistion Corp. see Dominion Exploration & Production Amoco Canada Petro Co. Ltd. BP CANADA Amoco Corp. BP AMERICA Amoco Production Co. MIDWEST OIL CORP & PANAM PET

9 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Amoco Production Co. BP AMERICA AMPCO Corporation 1977 TOTAL E&P USA INC Ampeco 1976-1 Ltd. BROCK EXPLORATION CORPORATION Ampeco 1980-1 Ltd. BROCK EXPLORATION CORPORATION Amquest Corp. 1985 BROCK EXPLORATION CORPORATION Amtane, Inc. BURMAH LP GAS INC. Amtexas (Natural Gasoline) WARREN AMERICAN OIL CO. ANADARKO E&P COMPANY, LP OCCIDENTAL PETROLEUM COMPANY ANADARKO PETROLEUM CORPORATION OCCIDENTAL PETROLEUM COMPANY Anadarko Production Corp. 1985 ANADARKO PETROLEUM CORPORA- Anchor Exploration Co. KERR-MCGEE CORP Anchor Oil & Gas Co. 1917 CONOCOPHILLIPS Anschutz Oil Company, LLC ANSCHUTZ EXPLORATION CORPORA- Ancon Partnership, Ltd. see Dominion Exploration & Production ANDERMAN OPERATING CO., INC. Anderman/Smith Operating Co. ST. MARY LAND & EXLORATION CO. Anderson & Kerr KERR-MCGEE CORP Anderson Exploration, Ltd (Canada) DEVON ENERGY CORP. Anderson Oil Co. CHESAPEAKE ORC, LLC Anderson Summit Inc. 1986 DERRICK PETROLEUM INC. Anderson-Prichard BURLINGTON RESOURCES Andover Oil Co. 1982 SANTA FE MINERALS, INC. Anderson Oil & Gas, Inc ANDERSON FEAZEL MANAGEMENT, ANDREW OIL AND GA PARTNERSHIP Andrew Oil and Gas Royalties, Inc. ANDREW OIL AND GAS PARTNERSHIP Andrews Petroleum Corp. 1924 FOREST OIL CORP. ANDREWS PRODUCTION CO. Anglo Energy Ltd. 1983 ROSEWOOD RESOURCES INC. ANM Services Corp. see Dominion Exploration & Production Annie R. Bass Grandson's Trust fbo Sid ARBGT (SRB) O&G TX (WY)(LA)(MULTI- Annie R. Bass Grandson's Trust fbo Lee ARBGT (LMB) O&G TX (WY)(LA)(MULTI- Annie R. Bass Grandson's Trust fbo Rob ARBGT (RMB) O&G TX (WY)(LA)(MULTI- ANR Production Co. 1985 EL PASO E&P COMPANY, LP Anschutz Oil Co. Inc. 1970 ANSCHUTZ CORP., INC. Anson Corporation CHESAPEAKE EXPLORATION LLC Anson Production Corporation CHESAPEAKE EXPLORATION LLC Antares Oil 1986 OXFORD CONSOLIDATED, INC. Antero Resources I, LP XTO ENERGY INC. Antioch Gathering Company 1992 ANADARKO PETROLEUM CORPORA- Antioch Texas Gathering Co. 1992 ANADARKO PETROLEUM CORPORA- ANVIL PETROLEUM CORP.

10 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

AOL Holdings, Inc. CHESAPEAKE ORC, LLC APACHE CORP. Apache Corporation 1985 DAVIS OIL CO. (DAVIS PETRO CORP.) Apache Oil & Gas Corp. DOW CHEMICAL APCOT_FINADEL Joint Venture 1986 TOTAL E&P USA INC APD Company 1989 APACHE CORP APEX OIL CO. Appalachian Expl. Inc. GREAT LAKES ENERGY PTRS, LLC APX Corporation 1992 ANADARKO PETROLEUM CORPORA- APX Western Corporation 1992 ANADARKO PETROLEUM CORPORA- Aquilla Energy Resources BLACK HILLS ENERGY Arcadia Resources, LP DORCHESTER RESOURCES, LP Arch Mineral Corp. 1969 ASHLAND OIL INC. Arch Oil & Gas Company 1993 WAGNER & BROWN, LTD. Arch Petroleum, Inc. PLAINS EXPLORATION & PRODUCTION ARCO Oil & Gas Co. BP AMERICA Arco Permian Basin BP AMERICA Ardmore Oil Co. 1917 EXXON CORPORATION Argent Energy, Inc. 1990 EL PASO E&P COMPANY, LP Argo Oil Corp. 1961 BP AMERICA Argo Petroleum 1987 * NATIONAL FUEL GAS CO. Argonaut Energy Corporation BROCK EXPLORATION CORPORATION Argus Production Co. HESS CORPORATION Arkansas Fuel Oil Corp. OCCIDENTAL OIL & GAS CORPORATION Arkla Exploration 1993 DEVON ENERGY Arkla Inc. CENTERPOINT ENERGY, INC. Arkoma Holding LLC XTO ENERGY INC. Arkoma Pittsburg Holding Corporation CHESAPEAKE EXPLORATION LLC Arkoma Production Co. 1994 DEVON ENERGY Arrowhead 1969 APACHE CORP. Arrowhead Energy Corp. RELIANCE ENTERPRISES, INC. ARROWSTONE PETROLEUM CORP. ARS CONTROL ACCOUNT LP managed by AVIVA Artex Exploration Company DEVON ENERGY Asamera, Inc. 1988 GULF CANADA RESOURCES LTD. ASCA LTD. managed by AVIVA Ashland Exploration Company ASHLAND OIL, INC. Ashland Oil & Refining Co. ASHLAND OIL, INC. ASHLAND OIL INC. Ashland Oil, Inc. 1979 * PIONEER NATURAL RESOURCES USA, Associated Natural Gas Corp. DUKE ENERGY FIELD SERVICES

11 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Aswell Inc. 1970 TOTAL E&P USA INC Atapaz Petroleum, Inc. 1979 WAINOCO OIL CORP. Atlantic Refining Co. 1966 BP AMERICA Atlantic Richfield Co. BP AMERICA Atlas Corporation 1958 TOTAL E&P USA INC Auora Gasoline Co. 1959 MARATHON OIL COMPANY Aus-Tex Oil & Royalty Corp. 1975 HOUSTON OIL & ENERGY, INC. Austral Oil Co. 1978 * EXXON MOBIL CORP. Austral Oil Co., Inc. 1982 see Dominion Exploration & Production Avance Oil & Gas Co. ANADARKO E&P COMPANY, LP Avanti CHESAPEAKE AVEN GAS & OIL, INC. Aviara Energy Corporation XTO ENERGY INC. AVIVA, INC. AX Acquisition Corp. see Dominion Exploration & Production Axcon Corp. see Dominion Exploration & Production Axem Energy Co. KERR-MCGEE CORP Axem Resources Incorporated KERR-MCGEE CORP Axem-Blackbird LLC KERR-MCGEE CORP Axem-Bluebell LLC KERR-MCGEE CORP Axem-JCEC LLC KERR-MCGEE CORP Axem-Production LLC KERR-MCGEE CORP Axroyalty, Inc. KERR-MCGEE CORP AZL Resources 1983 TOSCO CORP. Aztec Energy Corp. 1984 WICHITA RIVER OIL CO. Aztec Oil and Gas Co. 1976 CONOCOPHILLIPS Aztec Resources Corp. 1985 WEPCO ENERGY CO. B & A Pipe Line Company 1941, The Henderson Clay Products, Inc. B & B Drilling 1965 EXXON MOBIL CORP. B & N Petroleum, Inc. 1988 ANADARKO E&P COMPANY, LP B.E. Oil and Gas Company BROCK EXPLORATION CORPORATION BALBOA EXPLORATION CO. Balco Energy PLAINS RESOURCES, INC. Baldridge & King ANADARKO E&P COMPANY, LP Ballard & Cordell PLAINS RESOURCES, INC. Bankline Oil Co. 1959 CONOCOPHILLIPS Barber Oil Exploration Corp. 1981 FREEPORT-MCMORAN ENERGY PTNRS Barber Oil Reserves 1965 BP AMERICA Barfield Oil Corp. 1989 EVERGREEN OPERATING CORP. Bargo Energy Corp. PETROHAWK PROPERTIES, LP Barnsdall Oil Co. 1949 SUNOCO PARTNERS MKTG & TERM-

12 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Barnett Resources Corp WILLIAMS PRODUCTION RMT. CO. Baron Minerals LP LINN ENERGY HOLDINGS LLC Baron Minerals Management LLC LINN ENERGY HOLDINGS LLC Barron Surface Estates LLC LINN ENERGY HOLDINGS LLC BARTELL EXPLORATION Baruch-Foster Corp. APACHE CORP. Basics Oil & Gas Inc. LONGVIEW ENERGY COMPANY Basin Oil Company THE WISER OIL CO. Basin Petroleum Corp. 1980 CHEVRON CORP Bass Enterprises Production Company BEPCO, L.P. BASS PARTNERSHIP Bates Oil Corp. LASMO ENERGY CORP. Bay Petroleum 1955 see Tenneco Inc Bayard Drilling Technologies, Inc. NABORS DRILLING USA, LP Bayard Drilling, LLC NABORS DRILLING USA, LP Bayou Resources, Inc. 1987 NEWFIELD EXPLORATION MID- Bayou Resources, Inc. 1987 UNIT PETROLEUM CORP. (50%) Bayview Petroleum EXXON MOBIL CORP. BBX Oil Corporation GLADSTONE ROYALTIES LLC Beacon Exploration Co. TOKLAN OIL AND GAS CORPORATION Beacon Oil Co. 1981 ENERGY SOURCES INC. Bear State Oil Co. 1928 MARATHON PETROLEUM CO. Beard & Hammond JGM COMPANY Beard Oil Co. 1988 ANADARKO E&P COMPANY, LP Beard Oil Company SENSOR OIL & GAS, INC. Beardmore Oil Inc. 1973 CONOCOPHILLIPS Beau Coup Oil & Gas Corp. 1986 GREAT RIVER OIL & GAS CORP. Belcher Oil Co. 1977 EL PASO E&P COMPANY, LP Belco Development Co 1983 EOG RESOURCES, INC. Belco Energy Corp. 2001 KERR-MCGEE OIL & GAS ONSHORE, LP Belco Energy I, LP KERR-MCGEE OIL & GAS ONSHORE, LP Belco Oil & Gas 1983 EOG RESOURCES, INC. Belco Oil & Gas 2001 (different company) KERR-MCGEE OIL & GAS ONSHORE, LP Belco Petroleum Co. 1983 EOG RESOURCES, INC. Belco Petroleum North America, Inc. EOG RESOURCES, INC. Belco Wyoming Corporation EOG RESOURCES, INC. Belcor, Inc SILVER ASSETS, INC BELDEN & BLAKE ENERGY CO. Bell Petroleum Co. 1975 * PACIFIC ENTERPRISES OIL CO. (USA) Bellwether Exporation Co. PETROHAWK PROPERTIES, LP BelNorth Energy Corporation EOG RESOURCES, INC.

13 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

BelNorth Petroleum Co. 1986 EOG RESOURCES, INC. Belridge Oil Co. 1979 Shell Oil Co. Benedum-Trees Oil Co. 1982 KERR-MCGEE CORP. BeneTex 88, Ltd. KERRCO INC. BeneTex Oil and Gas Ltd. KERRCO INC. BENGAL OIL & GAS Benjamin F. Hackett, P.C. BENJAMIN F. HACKETT & ASSOCIATES Berea Oil & Gas Corp. 1985 ENERVEST MANAGEMENT PARTNERS Berkshire Oil Co. 1961 FRANKEL OIL & GAS CO. Berexco Inc. MANUEL CORPORATION Beta Operating Co., LLC PETROHAWK PROPERTIES, LP BHP PETROLEU (AMERICAS) INC. BHP Billiton Petroleum (TX Gathering), LLC BPX MIDSTREAM LLC BHP Billiton Petroleum (TxLa Operating) BPX OPERATING COMPANY BHP Billiton Petroleum Properties (GP), LLC BPX PROPERTIES (GP) LLC BHP Billiton Petroleum Properties (LP) LLC BPX PROPERTIES (LP) LLC BHP Billiton Petroleum (Eagle Ford Gather- BPX (EAGLE FORD) GATHERING LLC BHP Billiton Petroleum Properties (N.A.), LP BPX PROPERTIES (NA) LP BHP Billiton Petroleum (KCS Resources), BPX (KCS RESOURCES) LLC BHP Billiton Petroleum (WSF Operating), Inc. BPX (WSF OPERATING) INC. Big Dipper Oil Co. 1919 ASHLAND OIL INC. Big Five Oil Corp. 1985 ARROWSTONE PETROLEUM CORP. Big Piney Oil & Gas Co. SANDRIDGE ENERGY, INC. Big Piney Oil & Refining Co. 1955 SANDRIDGE ENERGY, INC. Bigheart Pipeline Company (see Koch Oil) Bishop Oil Co. 1961 Shell Oil Co. Bison Energy Corp PLAINS EXPLORATION & PRODUCTION Bison Production Company PLAINS EXPLORATION & PRODUCTION BK Energy Company BK EXPLORTION CORP. B-L ASSOCIATES BLACK BEAR LP managed by AVIVA Black Hawk Resources Corp OXFORD CONSILIDATED, INC. BLACK HILLS GAS RESOURCES, INC. Black Jack Resources, Inc. ANADARKO E&P COMPANY, LP BLACK TYPE LP managed by AVIVA Blackbird Co. (DISSOLVED) KERR-MCGEE CORP Blackfoot-Cherokee Energy, Inc. 1981 PLAINS PETROLEUM CO. Blackgold Energy Resources Inc. 1987 SNYDER OIL PARTNERS LP Blackhawk Drilling Co. 1931 KERR-MCGEE CORP. Blackhawk Oil Co. PETROHAWK PROPERTIES, LP BLACKSTONE MINERALS CORP.

14 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Blaffer & Farish 1917 EXXON MOBIL CORP. BlaMaCa Resources, Ltd. KERRCO INC. Blanco Oil Co. DALEN RESOURCES OIL & GAS CO. Bloomfield Royalty Corp. TEXON ENERGY CORP. BLUE FOX ROYALTY LP managed by AVIVA Bluebird Investment Company 1948 TOTAL E&P USA INC BMC Development #1, LP PETROHAWK PROPERTIES, LP BN Financial Services, Inc. BN Geothermal, Inc CONOCOPHILLIPS BN Leasing, Inc CONOCOPHILLIPS BNI Energy CONOCOPHILLIPS BNL Development Corp. CONOCOPHILLIPS Bodcaw Oil Properties 1979 PLACID OIL CO. Bogert Oil Co. DOMINION OKLA TEXAS EXPL & PROD. Bois D'Arc Energy Inc STONE ENERGY CORPORATION Bolero Energy Corp. 6/89 KAISER-FRANSIS OIL COMPANY BOLTEX OIL & GAS CO. Bomac Exploration Co. 1975 SAMSON PROD SERVICES COMPANY BONANZA PETROLEUM, INC. Bonanza Resources, Inc. 1984 PLAINS PETROLEUM CO. Bonnville Fuels Corp. EVERGREEN RESOURCES, INC. Bonray Driling Corp. NABORS DRILLING USA, LP Boomer Marketing Corp. SANDRIDGE ENERGY, INC. BORDER EXPLORATION CO. Boston-Wyoming Oil Co. 1928 CONOCOPHILLIPS Boswell Corp. SAMSON PROD SERVICES COMPANY Boundary Acquisition, Inc. see Dominion Exploration & Production Boundry Oil Co. see Dominion Exploration & Production Boundry Properties, Inc. see Dominion Exploration & Production BOUNTY PRODUCTION CO. Boyd Oil Corp. 1924 FOREST OIL CORP. BP AMERICA BP Exploration & Production Inc. BP AMERICA BP Exploration 1990 TEXICON OIL & GAS CO. Bracell Petroleum MURPHY OIL CORP. Bracken Exploration DIVERSIFIED ENERGIES, INC. Bradco Oil & Gas Co. NIKLOS OIL & GAS CO. Bradley Producing Corp. 1984 HESS CORPORATION Bradley Resources HESS CORPORATION Bradmar Petroleum Corp. SANDRIDGE ENERGY, INC. Brammer Supply (O&G Div) HEP OIL CO LTD

15 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Brandywine Oil BP AMERICA Brayton Land 1989 AMAX Coal Company Bravo Natural Resources Inc. CHESAPEAKE EXPLORATION LLC Brazos Coal, Ltd. THOUSAND OAKS DEV. CO. JT. VEN. Brazos Exploration Co. GOLIAD OPERATING COMPANY Brazos Oil & Gas Co. DOW CHEMICAL CO. Brazos Production Co. GOLIAD OPERATING COMPANY Brazos Young Corp. 1989 TENKAY RESOURCES INC. BRECKENRIDGE OPERATING CO. Brewer Oil & Gas Co. HESS CORPORATION BRG Petroleum Inc. 1998 DEVON ENERGY PROD. CO, LP BRG Petroleum Corp. 2005 CHESAPEAKE ENERGY CORP. BRG ENERGY INC. Bridewill & Darsey DARSEY OIL CO. Bridge Oil (USA) Inc. PARKER & PARSLEY DEVELOPMENT Bridge Oil Company PARKER & PARSLEY DEVELOPMENT Bridge Oil Company, L.P. PARKER & PARSLEY DEVELOPMENT Bridge Oil Production Company PARKER & PARSLEY DEVELOPMENT Bridger Exploration Inc 1984 OXFORD CONSILIDATED, INC. Bridger Petroleum Corp 1978 PRESDIO OIL CO. Brigham Exploration STATOIL Brighton Acquisitions Company LLC CHESAPEAKE EXPLORATION LLC Brinson & Colline UNITED PRODUCTION British American Oil Producing Co. 1956 DALEN RESOURCES OIL & GAS CO. BRITISH PETROLEUM CO. PLC Britoil PLC 1987 * see Dominion Exploration & Production Britoil PLC 1988 BRITISH PETROLEUM CO. PLC Britoil U.S. Holdings Inc. see Dominion Exploration & Production Britoil Ventures, Inc. HIGHMOUNT EXPLORATION & PRODUC- Brittany Petroleum Ltd Company CHESAPEAKE EXPLORATION LLC BROCK EXPLORATION CORPORATION Brock Gas Systems, Inc. BROCK EXPLORATION CORPORATION Brock Hydrocarbons, Inc. BROCK EXPLORATION CORPORATION Brock Oil and Gas Corporation BROCK EXPLORATION CORPORATION Brock Oil Corporation BROCK EXPLORATION CORPORATION Brock Production Corporation BROCK EXPLORATION CORPORATION Brock Resources, Inc. BROCK EXPLORATION CORPORATION Broken Arrow Royalty Co TOKLAN OIL AND GAS CORPORATION Brookhaven ENERGEN RESOURCES CORP. Brookhaven Oil Co. 1979 DALEN RESOURCES OIL & GAS CO. Brooks Hail Oil Co. 1984 SANDRIDGE ENERGY, INC.

16 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Brown Seal Oil Corp. 1924 FOREST OIL CORP. Brunner ENGELKE Bryson Oil & Gas Corp. 1988 CASPEN OIL, INC. BTU Operating Co. 1986 ENEX RESOURCES CORP. Buckhorn Petroleum Co. 1984 MCN EXPLORATION Buckhorn Petroleum Co. 1986 APACHE CORP. Buffalo Oil Co. 1958 CONOCOPHILLIPS Buffalo Oilfield Ser. Inc. GREAT LAKES ENERGY PARTNERS LLC Bunker Exploration, Inc. 1984 CHAPMAN ENERGY INC. Burkhard Petroleum Corp. 1987 ZG ENERGY CORP. Burlington Northern Oil & Gas Div. CONOCOPHILLIPS Burlington Northern Petroleum Inc. CONOCOPHILLIPS Burlington Resources Oil & Gas Co, LP CONOCOPHILLIPS Burmah Oil & Gas Co. 1976 * CONOCOPHILLIPS Bush Exploration 1982A-Ltd. CABOT OIL & GAS CORP. BUTTES OIL & GAS CO. Byrd Oil Corp. EXXON MOBIL CORP. C & K Petroleum, Inc. 1980 UNIMAR CORP. C.F. Braun Co. 1980 SANTA FE MINERALS, INC. C.J. Wrightsman W.A. MONCRIEF C.U. Bay see Tenneco Inc C.V. Lyman Shell Oil Co. C.J. Wrightsman W.A. MONCRIEF, JR. Calco 1961 CHEVRON CORP California Co. 1961 CHEVRON CORP California Oil Co. 1977 CHEVRON CORP California Oilfields, Ltd. 1913 Shell Oil Co. California Petroleum Corp. 1928 CHEVRON CORP CALLON PETROLEUM CO. Calpine Corporation ROSETTA RESOURCES INC Calpine Natural Gas Co. ROSETTA RESOURCES INC Calplans Oil & Gas Corp. MISSION RESOURCES PARTNERS LP CALUMET LUBRICANTS CO. Calumet Oil Co. CHAPARRAL ENERGY INC. Calvert Exploration Co. 1975 SUNOCO PARTNERS MKTG & TERM- Calvin Petroleum Corp. 1985 ENERGY OIL, INC. Cambridge Related Assets, Inc. GLOBAL NATURAL RESOURCES CORP. Cambridge Royalty Co. 1986 GLOBAL NATURAL RESOURCES CORP. Cameron Meadows Land Co. 1978 SANTA FE MINERALS, INC. Camroy Acquisition Corporation GLOBAL RESOURCES CORP Camroy Acquisition, Inc. GLOBAL RESOURCES CORP

17 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Canaan CHESAPEAKE KNAN ACQUISITION, LLC Canterra Energy Ltd. HUSKY OIL LTD. Canterra Petroleum, Inc. 1988 DANOV CORPORATION Canterra Petroleum, Inc. 1988 DABROS PROPERTIES, INC. Canusa Energy, Inc. 1984 PLAINS PETROLEUM CO. Canyon Energy, Inc. 1993 WAGNER & BROWN, LTD. Capital Fina Oil Company Inc. 1979 TOTAL E&P USA INC Capitan, Inc. E.E. NEARBURG Capitol Fina Pipeline Company 1985 TOTAL E&P USA INC Carbon Energy Corp. USA PIONEER NATURAL RESOURCES USA, Cardinal Petroleum Co. CONOCOPHILLIPS Caribou Four Corners 1984 HEADINGTON INVESTMENTS, INC. Carl Oil & Gas 1988 MCFARLAND ENERGY, INC. Carlin Oil & Gas Co. KAISER-FRANCIS OIL COMPANY Carolina Oil & Gas OCCIDENTAL OIL & GAS CORPORATION Carper Drilling MCFARLAND ENERGY, INC. Carr Oil Co. SUNOCO PARTNERS MKTG & TERM- Carrizo LLC CALLON LLC Cartel Inc. 1988 WASHITA PRODUCTION CO. Carter Oil Co. 1959 EXXON MOBIL CORP. Cascade CHEVRON CORP Case-Pomeroy Oil Corp. 1952 * FELMONT OIL CORP. Casex Co. HESS CORPORATION CASTLE ENERGY CORP. 1985 CATAMOUNT ROYALTY PARTNERS, LTD. managed by AVIVA CAVENHAM ENERGY RESOURCES Cayman Corporation CAYMAN RESOURCES CORPORATION Cayman Exploration Corporation CAYMAN RESOURCES CORPORATION CAYMAN RESOURCES CORP. CDC Ada, Inc. SUNDOWN ENERGY INC. CEI Bristol Aquisitions CHAPARRAL ENERGY INC. Celeron Corp. 1987 CHEVRON CORP Celeron Corp. 1987 EXXON MOBIL CORP. Celsius Energy Company QUESTAR EXPLORATION AND PRO- Cenaro Oil & Gas CHEVRON CORP Cenergy Corporation see Dominion Exploration & Production Cenergy Exploration Co. see Dominion Exploration & Production Cenergy Financial Corporation see Dominion Exploration & Production Cenergy International Company see Dominion Exploration & Production Cenergy Midwest Company see Dominion Exploration & Production Cenergy Transmission Company see Dominion Exploration & Production

18 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

CENEX, INC. Centex Oil & Gas, Inc. CONQUEST EXPLORATION CO. Central Louisiana Energy Corp. 1982 EXXON MOBIL CORP. Central Oil & Gas, Inc. ANADARKO E&P COMPANY, LP Central-Del Rio Oils Ltd. PANCANADIAN PETROLEUM CO. Centura Energy Corp. 1983 CASTLE ENERGY CORP. Century Oil & Gas 1987 CHARTERHALL PLC Century Production, Inc. 1986 HESS CORPORATION CF Industries, Inc. 1987 * KELLEY OIL CORP. Chalaco, Ltd. (Dissolved) KERR-MCGEE CORP Chambers & Kennedy UNIMAR CORP. Champlin Oil & Refining Co. 1964 ANADARKO E&P COMPANY, LP Champlin Petroleum Co. 1987 ANADARKO E&P COMPANY, LP Chanslor Western Oil/Dvlpmt. Co. 1978 DEVON ENERGY Chanslor-Canfield 1953 DEVON ENERGY Chaparral Energy Development Corp. 1980 NUGGET OIL CORP. CHAPARRAL ENERGY, LLC Chaparral Oil Inc. CHAPARRAL ENERGY INC. Chapman Energy Inc. CODA ENERGY CORP. CHAPMAN RESOURCES CHARLIE BARTON Charter Exploration & Production 1977 CRYSTAL OIL CO. CHARTERHALL PLC Chase Petroleum Co 1968 APACHE CORP. Cheniere Petroleum Corp. DEVON ENERGY Cherokee Resources, Inc. PETROHAWK PROPERTIES, LP Cherryville Corp. TEXAS INTERNATIONAL PETROLEUM Chesapeake BNR Corp CHESAPEAKE EXPLORATION LLC Chesapeake Cratex Corp CHESAPEAKE EXPLORATION LLC Chesapeake Cratex LLC CHESAPEAKE EXPLORATION LLC CHESAPEAKE ENERGY CORP. Chesapeake ENO Acquisitions LLC CHESAPEAKE EXPLORATION LLC Chesapeake EP LLC CHESAPEAKE EXPLORATION LLC Chesapeake Focus LLC CHESAPEAKE EXPLORATION LLC Chesapeake GH Corp CHESAPEAKE EXPLORATION LLC Chesapeake Investments ARCADIA RESOURCES, L.P. Chesapeake KNAN Acquisitions LLC CHESAPEAKE EXPLORATION LLC Chesapeake LNG LP CHESAPEAKE EXPLORATION LLC Chesapeake Mid- Continent Corp. CHESAPEAKE EXPLORATION LLC Chesapeake Mountain Front LLC CHESAPEAKE EXPLORATION LLC Chesapeake ORC, LLC CHESAPEAKE EXPLORATION LLC

19 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Chesapeake PEP Corp. CHESAPEAKE EXPLORATION LLC Chesapeake PRH Corp CHESAPEAKE EXPLORATION LLC Chesapeake Permian LP CHESAPEAKE EXPLORATION LLC Chesapeake RS Corp. CHESAPEAKE EXPLORATION LLC Chesapeake Sigma LP CHESAPEAKE EXPLORATION LLC Chesapeake Zapata LP CHESAPEAKE EXPLORATION LLC CHK Cratex LLC CHESAPEAKE EXPLORATION LLC CHK Louisiana LLC CHESAPEAKE EXPLORATION LLC Chessie Resources, Inc. Minerals Only ENERGEN RESOURCES CORP. Chevron Midcontinent CHEVRON CORP Chevron Production Company CHEVRON CORP Chevron USA CHEVRON CORP Chevron-Texaco CHEVRON CORP Chicago Corp. 1954 ANADARKO E&P COMPANY, LP Chief Holdings, LLC DEVON ENERGY Chief Oil & Gas LLC DEVON ENERGY Chieftain Petroleum, Inc. 1986 UMC PETROLEUM CORP. Chinook Resources BRIDGE OIL COMPANY, L.P. Chipola Oil Corp. 1982 TERRAPET ENERGY CORP. Chisos Trading Co. KAISER-FRANCIS OIL CO. Christie, Mitchell & Mitchell Co. DEVON ENERGY CIG Exploration, Inc. EL PASO E&P COMPANY, LP CIMA Energy, Ltd. CIMA ENERGY, LP Cimarron Operating Company RANGE RESOURCES - APPALACHIA, CINCO GENERAL PARTNERSHIP Circle X Oil and Gas LLC CHESAPEAKE EXPLORATION LLC Cisneros Oil Corporation 1967 TOTAL E&P USA INC Citation 1987 Investment LP CITATION 2002 INVESTMENT LP Citation 1989 Investment LP CITATION 2002 INVESTMENT LP Citation 1998 Investment LP CITATION 2002 INVESTMENT LP CITATION 2002 INVESTMENT LP Citation 1994 Investment LP CITATION 2002 INVESMENT LP Citgo Petroleum Corp. Pre 9/83 OCCIDENTAL OIL & GAS CORPORATION CITGO PETROLEUM CORPORATION Cities Service Oil & Gas Corp. OCCIDENTAL OIL & GAS CORPORATION Cities Services Oil Co. 1982 OCCIDENTAL OIL & GAS CORPORATION Citrus County Land Bureau, Inc. HESS CORPORATION Clark Oil & Refining Co. APEX OIL CO. Clark Resources, Inc. 1989 BRG PRODUCTION CO. Clarkland Royalty, Inc. CONOCOPHILLIPS Clarkland, Inc. CONOCOPHILLIPS

20 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Classic Oil & Gas, Inc. XTO ENERGY INC. Classic Petroleum, Inc. XTO ENERGY INC. Clayton Williams Energy, Inc. (CWI) NBL PERMIAN LLC Clusde R Lambe KOCH EXPLORATION COMPANY, LLC Clephane Oil Co. 1912 Shell Oil Co. Cliffwood Energy Co. 1988 CHEVRON CLINTON GAS SYSTEMS, INC. Clinton Oil Co. 1976 BHP PETROLEUM (AMERICAS) INC. Clymore Petroleum Corp. 1968 TESORO PETROLEUM CORP. CMS ENEGY, INC. CMS Nomeco Oil & Gas NEWFIELD EXPL MID-CONTINENT INC. CNG Producing Co. see Dominion Exploration & Production COAL CREEK EXPLORATION COMPANY managed by AVIVA Coastal Derby Refining Company EL PASO MARKETING, INC. Coastal Oil & Gas Corp. EL PASO E&P COMPANY, LP Coastal Oil & Gas Gathering, LP EL PASO E&P COMPANY, LP Coastal Oil & Gas USA, LP EL PASO E&P COMPANY, LP Coastal Oil Co. 1958 CONOCOPHILLIPS Coastal Production Co. EOG RESOURCES, INC. Coastal Refining and Marketing EL PASO MARKETING Coastal States Crude Gathering Co. EL PASO MARKETING Coastal States Gas Production Co. EL PASO E&P CO., LP Coastal States Trading, Inc. EL PASO MARKETING Cobo & Co, Inc. TOKLAN OIL AND GAS CORPORATION Coda Energy EOG RESOURCES, INC. CoEnergy Anadarko, Inc. SUNDOWN ENERGY INC. CoEnergy Central Expl. Inc. SUNDOWN ENERGY INC. CoEnergy Enhanced Prod. Co. SUNDOWN ENERGY INC. CoEnergy Midcontinent, Inc. SUNDOWN ENERGY INC. CoEnergy Operating Co. SUNDOWN ENERGY INC. CoEnergy Ventures, Inc. SUNDOWN ENERGY INC. COFFEYVILLE RESOURCES, LLC Coline Gasoline Corp. 1977 DEVON ENERGY Coline Oil Corp. 1977 DEVON ENERGY Colonial Oil Productions Co. 1966 TOTAL E&P USA INC Colorado Oil & Gas Corp. 1973 EL PASO E&P CO., LP Colorado Oil Co., Inc. EL PASO E&P CO., LP Colorado Western Exploration, Inc. 1958 CONSILIDATED OIL & GAS, INC. Colt Intermodal Inc. CONOCOPHILLIPS Coltexo Corp. OCCIDENTAL OIL & GAS CORPORATION Columbia Gas Development Corp. HUNT ENERGY (AEC), INC.

21 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

COLUMBIA NATURAL RESOURCES LLC Columbian Carbon Co. 1963 OCCIDENTAL OIL & GAS CORPORATION COLUMBINE I LP managed by AVIVA COLUMBINE II LP managed by AVIVA Cometra Oil & Gas Co. RANGE RESOURCES INC. Commodore Estates, Inc. GREAT LAKES ENERGY PARTNERS LLC Common Parent Corporation CONOCOPHILLIPS Commonwealth Oil Co. 1961 JUPITER CORP. Commonwealth Petroleum Co. 1922 Shell Oil Co. Comprehensive Resources Corp. 1984 DEVON ENERGY COMSTOCK RESOURCES, INC. Concho Oil Co. CHESAPEAKE ORC, LLC Concho Resources CONOCOPHILLIPS CONDER Conoco, Inc. CONOCOPHILLIPS Conquest Associates see Dominion Exploration & Production Conquest Associates 1983 see Dominion Exploration & Production Conquest Associates 1985 see Dominion Exploration & Production Conquest Associates II see Dominion Exploration & Production Conquest Associates-I Limited see Dominion Exploration & Production Conquest Associates-II Limited see Dominion Exploration & Production Conquest Exploration Company see Dominion Exploration & Production Conquest Texas, Inc. see Dominion Exploration & Production Conquest Transmission Company see Dominion Exploration & Production Conquest/N 1982 Limited Partnership see Dominion Exploration & Production Conquest/N 1985 Limited Partnership see Dominion Exploration & Production Conquest/N Matagorda LP see Dominion Exploration & Production Conquest/NM Matagorda LP see Dominion Exploration & Production Conquest/NWM 1982 Texas Oil & Gas LP see Dominion Exploration & Production Conquest/NWM Texas Oil & Gas see Dominion Exploration & Production Conquest/P 1982 Limited Partnership see Dominion Exploration & Production Conquest/P 1985 Limited Partnership see Dominion Exploration & Production Conquest/P Matagorda Limited Partnership see Dominion Exploration & Production Consolidated Gas Supply Corp. see Dominion Exploration & Production Consolidated Natural Gas see Dominion Exploration & Production Consolidated Oil & Gas Inc HUGOTON ENERGY CORP. Consolidated Oil Corp. 1943 BP AMERICA Consolidated Oil/Gas Acquisition Co. 1990 CONSILIDATED OIL & GAS, INC. Consolidated Production FREEPORT-MCMORAN ENERGY PTNRS Consolidated Rimrock Oil Corp. 1958 CONSOLIDATED OIL & GAS, INC. Continental Eastern Corp. CHEVRON CORP

22 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Continental Oil Co. CONOCOPHILLIPS Continental Resources Corp. CHAPMAN ENERGY INC. Continental Western Corp. CHEVRON CORP U.S.A. INC. CONVEST ENERGY CORP. Cook & Hackett, ttorneys BENJAMIN F. HACKETT & ASSOCIATES Coquina Oil FREEPORT-MCMORAN ENERGY PTNRS Coquina Oil Corp. PRIMARY FUELS, INC. Coquina Oil Corp. 1993 AMERICAN NATIONAL PETROLEUM CO. Coral Reserves Natural Gas Income Fund CHESAPEAKE KNAN ACQUISITION, LLC Cornet Oil * CONDER Coronado Corp. 1941 BP AMERICA Corpus Christi Oil & Gas Co. DALEN RESOURCES OIL & GAS CO. CORTEX OPERATING CO. Cortez Operating Co. ENCORE OPERATING, LP Cosden Oil & Chemical Co. 1985 TOTAL E&P USA INC Cosden Oil Co. 1932 CONOCOPHILLIPS Cosden Petroleum Corp. 1963 TOTAL E&P USA INC Cosden Pipe Line Company 1994 FINA PIPE LINE CO. COSDEN, INC. Coseka Resources (USA) Limited WAGNER & BROWN, LTD. Cotton Petroleum 1986 APACHE CORP. Cotton Petroleum Corp. 1987 MORAINE PRODUCTION LTD. Coty LARIO OIL & GAS CO. Covey Park COMSTOCK RESOURCES Cow Gulch Oil Co. 1973 K.R.M. PETROLEUM CORP. COX & PERKINS EXPLORATION, INC. COX OIL & GAS, INC. CPC Exploration Co. 1985 COX & PERKINS EXPLORATION, INC. CRA Inc FARMLAND INDUSTRIES, INC. CRA International, Ltd. GLOBAL NATURAL RESOURCES CORP. Crainfill & Reynolds 1933 EXXON MOBIL CORP. Cravens Oil Co. XTO ENERGY INC. CREDO PETROLEUM CORP. CRESCENT OIL & GAS CORP. Crescent Petroleum Corp. CRESCENT OIL & GAS CORP. Crescent Royalty Co. 1931 CONOCOPHILLIPS Creslenn Oil Co. 1979 SOUTHWEST ROYALTIES, INC. U.S. OIL Crestmont Oil & Gas Co. 1981 OCCIDENTAL OIL & GAS CORPORATION Crimson Energy J-M HUBER CORP. CRIMSON EXPLORATION INC Cross Bell Company HAMPTON RESOURCES

23 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Cross Timbers Oil Company XTO ENERGY INC. Cross Timbers Oil Company LP XTO ENERGY INC. Cross Timbers Operating Co. XTO ENERGY INC. Cross Timbers Production XTO ENERGY INC. Crow Creek Energy, LLC PENN VIRGINIA CORP. Crow Creek Energy II, LLC EAGLE ROCK MID-CONTINENT ASSET, CROWN CENTRAL PETROLEUM CORP. Crown Zellerbach (Energy Div.) 1985 CAVENHAM ENERGY RESOURCES Crusader Energy Corporation ENCORE OPERATING, LP CRYSTAL OIL CO. CSX Oil & Gas Corp. 1988 ENERGEN RESOURCES CORP. Cudahy Refining Co. BP AMERICA Cuervo Resources, Inc. CUERVO, INC. CUERVO, INC. Cullen BURLINGTON RESOURCES Cummins & Walker Oil Co., Inc. DALEN RESOURCES OIL & GAS CO. CXY Energy Inc. NEXEN PETROLEUM U.S.A. INC. Cycle Oil & Gas Corp. FRONTIER ENERGY CORP. Cyclops Corp. 1987 * ROSCOE GAS & OIL CO. Cypher Energy Corp. ALLIANCE EXPLORATION CORP. D.C. BINTLIFF D & D Oil and Gas LLC CHESAPEAKE EXPLORATION LLC D.D.I., INC 1989 Dabb Energy Company DIAMOND S ENERGY COMPANY Dabros Properties 1988 JN EXPLORATION & PRODUCTION DABROS PROPERTIES 1988 Dacresa ENERGEN RESOURCES CORP. Dakota Resources, Inc. 1983 VALEX PETROLEUM, INC. Dalco Oil Co. 1976 PACIFIC ENTERPRISES OIL CO. (USA) Dalen Resources Oil & Gas Co. NEWFIELD EXPLORATION GULF COAST Dallas Oil & Minerals Inc. RANGE PROD. CO. Dallas Sunbelt Energy, Inc. 1982 CHAPMAN ENERGY, INC. Dal-Oil Inc. GREAT LAKE ENERGY PARTNERS LLC Damson Oil Corp PIONEER NATURAL RESOURCES USA, Danciger Oil & Refining Co. 1948 BP AMERICA Daniel Oil Co. PARTNERS OIL CO. DANOV CORPORATION 1988 Darby Petroleum Co. 1944 SUNOCO PARTNERS MKTG & TERM- DARSEY OIL CO. Davis Oil Co. DAVIS PETROLEUM CORP. Davis Oil Co. (Davis Petroleum Corp.) QUINOCO CO. 1988

24 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Davis Oil Co. 1981 PRESDIO OIL CO. Dawn Energy Co. 1986 ONEOK EXPLORATION CO. Dean Brothers BP AMERICA Deca Energy Corp. 1985 K.R.M. PETROLEUM CORP. Deep Gas Exploration Inc. 1985 RATEX RESOURCES INC. Deep Rock Oil Co. 1954 * CONOCOPHILLIPS Deep Rock Oil Corp. 1955 KERR-MCGEE CORP DEKALB ENERGY CO. DeKalb Petroleum Co. 7/92 (Depco) DOMINION OKLA TEXAS EXPL & PROD. Del Mar Petroleum, Inc. SAMSON PROD SERVICES COMPANY Del mar Production CONOCOPHILLIPS Del Ray Petrouelm Co. 1952 see Tenneco Inc Delhi Oil Corp. 1955 see Tenneco Inc Delhi-Taylor Oil Corp. 1964 see Tenneco Inc Delta Drilling Company KERR-MCGEE CORP Delta Drilling USA, LP NABORS DRILLING USA, LP Deltaus Corp. NABORS DRILLING USA, LP Delwood 1964 APACHE CORP. Deminex U.S. Oil Co SOUTHWEST ROYALTIES, INC. DENOVO OIL & GAS CO. Depco, Inc. DEKALB ENERGY CO. Derby Refining Company EL PASO MARKETING, INC. DERRICK PETROLEUM INC. Desert American Agency, Inc. CONOCOPHILLIPS Desert Magic Inc. CONOCOPHILLIPS Desert Royalty Corp (1992) MARIENFELD ROYALTY CORP. Destry Gas Co., Ltd. PETER PAUL PETROLEUM CO., DEN. Devex Resources KERR-MCGEE CORP DEVON ENERGY CORP. DEVON ENERGY PROD. CO, LP Devon Louisiana Corp DEVON ENERGY PROD. CO, LP Devon SFS Operating Inc. DEVON ENERGY CORP. Devonian Gas & Oil Co. CHEVRON CORP Devx Energy, Inc. COMSTOCK RESOURCES DI INDUSTRIES INC. Diablo Oil Co. 1987 WICHITA RIVER OIL CO. Daimex Co. ANADARKO E&P COMPANY, LP Diamond Alkali MAXUS EXPLORATION Diamond Shamrock Corp. 1987 MAXUS EXPLORATION Diamond Shamrock Offshore Partners LP CONOCOPHILLIPS Dickson Oil Company 1949 KAISER-FRANCIS OIL CO.

25 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Dietrich Resources Corp. 1987 SANDRIDGE ENERGY, INC. Discovery Oil, Ltd. 1986 SEAHAWK OIL INTERNATIONAL, INC. Diversa, Inc. MAYNARD OIL COMPANY Diverse Energy Investments FORTUNE NATURAL RESOURCES COR- Diverse GP FORTUNE NATURAL RESOURCES COR- Diverse GP III FORTUNE NATURAL RESOURCES COR- Diverse Operating Company DIVERSE ENERGY INVESTMENTS DIVERSIFIED ENERGIES, INC. Dixel Resources, Inc. ANADARKO E&P COMPANY, LP Dixie Oil Co. 1919 BP AMERICA DKM Energy Inc. INTERCOAST OIL & GAS CO. DKM Offshore Energy, Inc. MEDALLION CALIFORNIA PROPERTIES DKM Resources, Inc. KCS RESOURCES, INC. Dodson Prod., LLC PENT ENERGY, LLC Dolphin Energy LLC NEWFIELD EXPLORATION MID- Domain Energy Corp RANGE ENERGY CORP. Domain Energy Finance Corp RANGE ENERGY FINANCE CORP. Domain Energy Guarantor Corp RANGE ENERGY GUARANTOR CORP. Domain Energy Prod. Co. RANGE ENERGY VENTURE CORP. Domain Energy Ventures Corp. RANGE ENERGY VENTURE CORP. Dome Petr. Corp. (U.S. Assets) 1983 * CHEVRON CORP Dome Petroleum Ltd. 1988 AMOCO CANADA PETRO CO. LTD Dominion (offshore) ENI PETROLEUM CO INC. Dominion Black Warrior Basin, Inc. HIGHMOUNT BLACK WARRIOR BASIN, Dominion Exploration & Production HIGHMOUNT EXPL AND PROD LLC Dominion Exploration & Production, Michigan LINN ENERGY, LLC Dominion Midwest Energy, Inc. HIGHMOUNT EXPL & PROD MICHIGAN Dominion Midwest Energy, Inc. XTO ENERGY, INC. (all but Michigan) Dominion Offshore TX & LA ENI PETROLEUM CO INC. Dominion Oklahoma Texas Exploration & LINN ENERGY, LLC Dominion Permian, TX HIGHMOUNT EXP & PROD LLC Dominion Resources, Inc. CONSOL ENERGY INC. Domionion Rocky Mountian XTO ENERGY DON FRANTZEN Don L. Mount BOUNTY PRODUCTION CO. Donald Slawson Oil Producer SLAWSON EXPLORATION CO., INC. Dorchester Exploration, Inc. 1984 DAMSON OIL CORP. Dorfman Production W.H. HEISLER, JR. Dorothy Corp. 1984 DEVON ENERGY Dorrance FRAZIER Double Eagle Exploration, Inc. MKI ENERGY, INC.

26 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

DOW CHEMICAL CO. Dowdle Oil Corp. 1981 WESTERN NATURAL GAS CO. DPI-GP, Inc. CONOCOPHILLIPS Drel Petroleum 1979 ORIGINALA PETROLEUM CORP. DREW CORNELL, INC. Dreyer Bros., Inc. CONOCOPHILLIPS Drillers, Inc. 1985 DI INDUSTRIES, INC. Drillexco 1962 BP AMERICA Drilling & Exploration Co. 1962 BP AMERICA DUKE ENERGY FIELD SERVICES Duke Energy T & T Co. TEPPCO CRUDE OIL LP Dundee Petroleum Co. 1915 Shell Oil Co. Duran Energy Corp. 1984 WENTEX INTERNATIONAL, INC. DX Oil Co. 1962 SUNOCO PARTNERS MKTG & TERM- Dyco Petroleum Corp. 1985 DIVERSIFIED ENERGIES, INC. Dynamar Energy Inc. 1986 KERR-MCGEE CORP Dynamic of Texas, Inc. 1979 CONOCOPHILLIPS Dynasty Oil & Minerals, Inc. 1984 RANGE PRODUCTION CO. MINERALS, E.E. Fogelson 1964 Shell Oil Co. E.E. NEARBURG E.H. McDermott J.D. WRATHER, JR. E.L. Hilliard II Interests 1988 COMSTOCK RESOURCES, INC. E.L. Hilliard III Interests 1988 COMSTOCK RESOURCES, INC. E.G. Operating SUNDOWN ENERGY, INC. Eagle Energy Inc. HIGHMOUNT EXPLORATION & PRODUC- EAGLE EXPLORATION CO. EAGLE OIL & GAS CO. Eagle Oil Co. 1978 see Dominion Exploration & Production Eagle Rock Mid-Continent Asset, LLC EAGLE ROCK ENERGY PARTNERS, L.P. Earlsboro Oil & Gas 12/90 DOMINION OKLA TEXAS EXPLOR. & Earnest H. Lambert GLOBAL NATURAL RESOURCES CORP. Earth Resources Co. 1981 see Dominion Exploration & Production Eason Oil Co. 1985 EL PASO E&P COMPANY, LP East Resources Inc. (West Virginia NOT TALISMAN ENERGY USA INC East Timbers Oil, LP XTO ENERGY, INC. Eastern Petroleum Co. GREAT LAKES ENERGY PARTNERS LLC Eastland Oil BP AMERICA Eastwash Corp. GREAT LAKES ENERGY PARTNERS LLC Easy Wind Oil Co. 1986 DERRICK PETROLEUM INC. Echo Oil Corp. 1979 FOREST OIL PERMIAN CORP. ECOS Corporation CONOCOPHILLIPS

27 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Edson Petroleum Co. 1970 OCCIDENTAL OIL & GAS CORPORATION Edward P. Bass Edwards & Leach Oil Co. 1984 SANDRIDGE ENERGY, INC. Edwin L. & Berry R. Cox COX OIL & GAS INC. EEX Corp. NEWFIELD EXPLORATION GULF COAST EGRET ENERGY CORP. El Can Petroleum Company CONOCOPHILLIPS El Paso Company CONOCOPHILLIPS (through Burlington EL PASO E&P CO., LP El Paso Exploration Co. 1985 CONOCOPHILLIPS El Paso Frontera Corporation CONOCOPHILLIPS El Paso Gas Marketing Co. CONOCOPHILLIPS El Paso Gas Transportation Company CONOCOPHILLIPS El Paso Hydrocarbons Co. CONOCOPHILLIPS El Paso Hydorcarbons Gas Processing Co. CONOCOPHILLIPS El Paso Hydrocarbons Pipeline Co. CONOCOPHILLIPS El Paso Hydrocarbons Service Co. CONOCOPHILLIPS El Paso Hydrocarbons Transportation Co. CONOCOPHILLIPS El Paso Natural Gas Clearinghouse Co. CONOCOPHILLIPS El Paso Natural Gas Company CONOCOPHILLIPS El Paso Production Company CONOCOPHILLIPS El Paso Production Oil & Gas USA, LP EL PASO E&P COMPANY, LP El Paso Products Company CONOCOPHILLIPS El Paso Storage Company CONOCOPHILLIPS El Rey Petroleum, Inc. JOHN P. MCHAUGHTON El Toro Exploration ROLAND LIBERDA Eland Energy, Inc. SUNDOWN ENERGY INC. Eldorado Refining Company 1968 AMERICAN PETROFINA PIPELINE CO. Elf Acquitaine Inc. TOTAL E&P USA INC Elf Exploration, Inc. TOTAL E&P USA INC Elk Basin Petroleum Co. 1928 CONOCOPHILLIPS Elk River Resources SUNCO PARTNERS MKTG & TERMINALS Elysium Energy, LLC NOBLE ENERGY, INC EMCOR PETROLEUM CO. Emejota Engineering Corporation TOTAL E&P USA INC Empire Energy 1980 BP AMERICA Empire Oil Company OCCIDENTAL OIL & GAS CORPORATION Empire Southern Production Co. ANDREWS PRODUCTION CO. Encana Corp OVINTIV INC. ENCINO ENERGY & DEVELOPMENT CORP. ENCORE OPERATING, LP

28 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

ENDEAVOR NATURAL GAS, LP ENERGEN RESOURCES Energen Resources MAQ, Inc. ENERGEN RESOURCES CORP. Energy Corp. of America, Inc. EQUITABLE PETROLEUM CORP. ENERGY DEVELOPMENT CORP. ENERGY DEVELOPMENT PARTNERS LTD. Energy Methods Corp. EMCOR PETROLEUM CO. Energy Oil & Gas Corp. 1978 OIL CITY PETROLEUM, INC. ENERGY OIL INC. Energy Oil Inc. of Colorado SNYDER OIL PARTNERS Energy Reserves Group Inc. 1985 BHP PETROLEUM (AMERICAS) INC. Energy Resources Corp. 1984 * RIO PETROLEUM INC. ENERGY SOURCES INC. Enertec Corp. RIO PETROLEUM INC. ENEX RESOURCES CORP. Enfield Energy 81-A DOMINION EXPL & PROD INC. Enfield Energy 84-A see Dominion Exploration & Production ENGELKE Enhanced Energy Resources ANADARKO E&P COMPANY, LP Enopco, Inc. 1989 UMC PETROLEUM CORP. Enpal, Inc. 1989 UMC PETROLEUM CORP. EnRe, LP (Texas Properties) J-W OPERATING CO. Enron Corp., E&P Division EOG RESOURCES, INC. Enron Exploration Company EOG RESOURCES, INC. Enron Oil & Gas Co. EOG RESOURCES, INC. Enron Oil & Gas Marketing, Inc. EOG RESOURCES, INC. Enron Producing Company EOG RESOURCES, INC. Enserch Corporation NEWFIELD EXPLORATION GULF COAST Enserch Energy, inc. NEWFIELD EXPLORATION GULF COAST Enserch Exploration, inc. NEWFIELD EXPLORATION GULF COAST Enserch Oil Company NEWFIELD EXPLORATION GULF COAST Enserch Sacroc, Inc. NEWFIELD EXPLORATION GULF COAST Ensign Oil Co. KERR-MCGEE CORP Ensource, Inc 1989 UMC PETROLEUM CORP. Enstar Petroleum Corp. 1985 UNIMAR CORP. Entech Gas Ventures ENCANA ENERGY Enterprises Energy Corp. 1986 BELDEN & BLAKE ENERGY CO. Enterprise Gas Co. ENTERPRISE RESOURCES INC. ENTERPRISE RESOURCES INC. Entex Energy Operations Ltd. 1987 UMC PETROLEUM CORP. Entex Petroleum Inc. 1987 UMC PETROLEUM CORP.

29 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

EOG RESOURCES, INC. EOTT Company PLAINS ALL AMERICAN PIPELINE, LP EP Operating Ltd. Partnership NEWFIELD EXPLORATION GULF COAST EPCO, Inc. ENTERPRISE PRODUCTS COMPANY EPX Co. CONOCOPHILLIPS Equatorial Energy, Inc. RESOLUTE ENERGY, INC. Equitable Gas Co. 1985 EQUITABLE RESOURCES INC. EQUITABLE PETROLEUM CORP. EQUITBLE RESOURCES INC. EQUITY OIL CO. Equiva Trading Co. SHELL TRADING (U.S.) CO, ESKEY INC. Espero Energy SOUTHWEST ROYALTIES INC. Essex Exploration, Inc. 1983 see Dominion Exploration & Production Ethyl Oil & Gas Corp. 1989 TREDEGAR OIL & GAS CORP. Ethyl Petroleum Corp. 1989 TREDEGAR PETROLEUM CORP. Ethyl Properties, Inc 1989 TREDEGAR PROPERTIES, INC. EuroTex Resources, Inc. KERRCO INC. EVERGREEN OPERATING CORP. Evergreen Resources, Inc. PIONEER NATURAL RESOURCES USA, Excalibur Ventures Inc. 1987 BALBOA EXPLORATION CO. Exchange Oil & Gas Corp. 1985 TRANSCO EXPLORATION PARTNERS Exchange Oil & Gas Corp. 1986 * TOTAL E&P USA INC Exeter Exploration 1986 APACHE CORP. Exeter Exploration Co. MCN EXPLORATION Ex-Mission Ranches, Inc. CONOCOPHILLIPS Exploration Co. of Louisiana Inc. 1987 * FINA OIL & CHEMICAL CO. EXXON MOBIL CORP. F.E. HARPER F.K. Johnson ANADARKO PETROLEUM CORPORA- F.P. Kendall Oil Co. 1958 CONOCOPHILLIPS F.T. JOHNSON, JR. F. W. Merrick, Inc. 1943 CONOCOPHILLIPS Fabco Oil Co., Inc. (Merger) IMPERIAL OIL COMPANY Fadsin Production, Inc. 1984 DEVON ENERGY Fair Oil Company 1975* TOTAL E&P USA INC Falcon Seaboard Inc. 1979 MAXUS ENERGY CORP. Fargo Oils Ltd. CHEVRON CORP FARMERS OIL COMPANY Farmer's Union Central Exchng, Inc 12/93 CENEX, INC. Farmland Industries, Inc. COFFEYVILLE RESOURCES, LLC

30 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Faulkner Corporation CHESAPEAKE EXPLORATION LLC FCD Oil Corp. 11/86 DOMINION EXPL & PROD INC. FEC offshore Inventory Company EOG RESOURCES, INC. Federated Energy 1985 FEDERATED NAT RESOURCES CORP. FEDERATED NATURAL RESOURCES FELL & WOLFE OIL CO. Felmont Oil & Gas Co. 1990 TORCH OIL & GAS CO. FGL, Inc. SUNDOWN ENERGY, INC. FIDELITY OIL CO. Fifteen Oil Co. 1960 see Tenneco Inc Filon Exploration Co. 1979 see Dominion Exploration & Production Fina Exploration, Inc. 1989 TOTAL E&P USA INC Fina LaTerre, Inc. TOTAL E&P USA INC Fina Oil & Chemical Co. TOTAL E&P USA INC Fina Oil and Gas, Inc. 1988 TOTAL E&P USA INC Fina Supply, Inc. 1985 TOTAL E&P USA INC Fina, Inc. TOTAL E&P USA INC Finadel Exploration, Inc. 1987 TOTAL E&P USA INC Finadel Pipe Line Company 1984 TOTAL E&P USA INC Finadel, Incorperated 1982 TOTAL E&P USA INC Financial Technology Inc. 1975 TEXON ENERGY CORP. FINATERRE, INC. Fine Line Diversified Ventures, Inc. FINE LINE O&G TX (WY)(LA)(MULTI- Fin-Oil, Inc. 1988 TOTAL E&P USA INC FIN-TEX PIPELINE COMPANY FIRST ENERGY CORP. First Mississippi Corp. FIRST ENERGY CORP. First Permian, LP ENERGEN RESOURCES CORP. FIVE STAR ROYALTY PARTNERS, LTD. managed by AVIVA Flag Oil Corp. 1970 KERR-MCGEE CORP Flag-Redfern Oil Co. 1988 KERR-MCGEE CORP Flagstone Petroleum Corp. MAP RESOURCES, INC. Florida Exploration Co. 1984 EOG RESOURCES, INC. Florida Gas Exploration Co. 1979 EOG RESOURCES, INC. Floyd Karsten CHEVRON CORP Fluor Oil & Gas Corp. PRIMARY FUELS, INC. FMP Operating Co. A Ltd. Partnership 1990 FREEPORT-MCMORAN OIL & GAS Focus Energy LLC CHESAPEAKE EXPLORATION LLC Fohs Oil Co. 1946 BP AMERICA FORCHALL OIL Forest Oil Co., Inc. 1924 FOREST OIL CORP.

31 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Forest Oil Corporation SABINE OIL & GAS CORPORATION Forest Oil Corp. 1974 * SUNCO PARTNERS MKTG & TERMINALS FOREST OIL PERMAIN CORP. Fortuna Energy TALISMAN ENERGY USA INC Fountain Oil & Gas Inc. WICHITA RIVER OIL CO. Four Queens Petroleum Corp. FELL & WOLF OIL CO. Fourpoint Energy, LLC UNBRIDLED RESOURCES, LLC FP, Inc RANGE RESOURCES - APPALACHIA, FPCO Oil & Gas Co. 1987 FREEPORT-MCMORAN OIL & GAS Franco Petroleum Co. 1913 BP AMERICA Franco Western CONOCOPHILLIPS Franco Wyoming Oil CONOCOPHILLIPS Frankel Oil Co. FRANKEL OIL & GAS CO. Frankfort Oil Co. SUNCO PARTNERS MKTG & TERMINALS Frantz Corp. 1928 CONOCOPHILLIPS FRAZIER Fred Olson Inc. VOLVO PETROLEUM, INC. Freedom Energy, Inc. SEDNA ENERGY, INC. Freeport Oil Co. FREEPORT-MCMORAN INC. Freeport-McMoRan Energy Partners 1990 FREEPORT-MCMORAN OIL & GAS FREEPORT-MCMORAN OIL & GAS FREMONT ENERGY CORP. French Petroleum Corporation RANGE RESOURCES - APPALACHIA, Frio Drilling Co. 1982 FRIO EXPLORATION CO. FRIO EXPLORATION CO. Frontier Acquisition Corp. RATEX RESOURCES INC. FRONTIER ENERGY CORP. FRONTIER OIL CORPORATION Fuhrman Petroleum Corp. CONOCOPHILLIPS Fullerton Oil 1953 EXXON MOBIL CORP. Funk Exploration 1985 ANADARKO E&P COMPANY, LP Future Acquisition 1995, Ltd. PETROHAWK PROPERTIES, LP Future Energy Corp. PETROHAWK PROPERTIES, LP Future Petroleum Corp. PETROHAWK PROPERTIES, LP Future Resources 1981 BOGART OIL CO./LOUIS DREYFUS GAS G.O.C. Corp. 1984 DEVON ENERGY G.P. Livemore, Inc. GREAT WESTERN OIL G/O INTERNATIONAL, INC. Galaxy Oil Co. 1987* GLOBAL NATURAL RESOURCES CORP. Galena-Signal Oil Co. 1928 CHEVRON CORP Gamble-Daniel Operating Co. PARTNERS OIL CO.

32 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Garfield County Exploration CHEVRON CORP U.S.A. INC. Gas Anadarko, Ltd Successors, The AVEN GAS & OIL, INC. Gas Producing Enterprices, Inc. BORDER EXPLORATION CO. GASOLINE PRODUCTION CORP. GBK LLC Holdings GBK Investments, LLC GCO Minerals Company CHEVRON CORP. Gem Oil, Inc. see Dominion Exploration & Production Gemini Corp. 1986 ANADARKO E&P COMPANY, LP General American Oil Co. 1983 CONOCOPHILLIPS General Atlantic Energy Corp. UMC PETROLEUM CORP. General Atlantic Gulf Coast Inc. UMC PETROLEUM CORP. General Atlantic Resources Inc. UMC PETROLEUM CORP. General Crude Oil Co. 1979 EXXON MOBIL CORPORATION GENERAL ENERGY OPERATIONS LTD. GENERAL ENERGY RESOURCES & TECH- General Hydrocarbons Inc. 1985 ENCANA ENERGY General LP Acquisition Inc. 1989 UMC PETROLEUM CORP. General Petroleum Corp. 1926 EXXON MOBIL CORP. General Producing Co. 1988 UMC PETROLEUM CORP. General Production Co., Inc. 1983 ZAPATA EXPLORATION CO. Genesis Petroleum Corp. 1986 * DEVON SFS OPERATING, INC. GeoDynamics Oil & Gas, Inc. 1984 DEVON ENERGY Geodyne Resources 1993 SAMSON PROD SERVICES COMPANY GeoResources Management Corp. 1984 DEVON ENERGY George J. Greer Trustee 1957 see Dominion Exploration & Production George M. Shanor 1969 F.T. JOHNSON, JR. George Mitchell & Associates DEVON ENERGY George R. Brown, Oil & Gas Div. HIGHLAND RESOURCES, INC. George Rodman Inc. 1984 CHAPMAN ENERGY INC. Gerber Energy International 1987 GOLD KING CONSOLIDATED, INC. Getty Oil Co. 1984 CHEVRON CORP. GHK CO. GHR Energy Corp. 1986 TRANSAMERICAN NATURAL GAS CORP. GIBRALTAR EXPLORATION LTD. Gilcrease Oil Co. VENUS OIL CO. Gilliland Producting & Refining 1936 CONOCOPHILLIPS Gillring Oil Co. RANGE PROD. CO. Gillring Prod. Co. RANGE PROD. CO. GKM Inc. 1987 PETROMARK RESOURCES CO. Glacier Arizona Company CONOCOPHILLIPS Glacier Park Boulder Company CONOCOPHILLIPS

33 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Glacier Park Company CONOCOPHILLIPS Glacier Park Denver Company CONOCOPHILLIPS Glacier Park Gateway Company CONOCOPHILLIPS Glacier Park Kent Industrial Co. Glacier Park King Street Co. CONOCOPHILLIPS Glacier Park Liquidating Co. CONOCOPHILLIPS Glacier Park Naperville Co. CONOCOPHILLIPS Glacier Park Northwest CONOCOPHILLIPS Glacier Park Orillia Company 1 CONOCOPHILLIPS Glacier Park Riverpoint Company CONOCOPHILLIPS Glacier Park South Lander Co. CONOCOPHILLIPS Glacier Park Wayzata Co. CONOCOPHILLIPS Glacier Production Co. 1944 CHEVRON CORP Gladstone Royalties LLC LINN ENERGY HOLDINGS, LLC Glen McCarthy 1957 * EOG RESOURCES, INC. GLOBAL NATURAL RESOURCES CORP. Global Natural Resources Corp. of Maryland GLOBAL NATURAL RESOURCES CORP. Global Natural Resources Corp. of Texas GLOBAL NATURAL RESOURCES CORP. Global Nevada-Galaxy I Ltd. GLOBAL NATURAL RESOURCES CORP. Global Nevada-Galaxy, Inc. GLOBAL NATURAL RESOURCES CORP. Globe Oil & Refining Co. LARIO OIL & GAS CO. Glorieta Oil Co. KERR-MCGEE CORP Glover Hefner Kennedy Oil Co. GHK CO. GOLD KING CONSOLIDATED, INC. Golden Exploration & Production Corp. LONGVIEW PRODUCTION COMPANY GoldKing Production Co. 1985 DENOVO OIL & GAS CO. GOLIAD OPERATING COMPANY Goliad Partners, LP GOLIAD O&G TX (WY)(LA)(MULTI- Good Hope Refineries Inc. TRANSAMERICAN NATURAL GAS CORP. Gordon Exploration Co. GOLIAD OPERATING COMPANY Gordon Street, Inc. 1969 NORTH AMERICAN ROYALTIES, INC. Gothic Energy Corp. CHESAPEAKE Grace Petroleum Corp. 1993 SAMSON PROD SERVICES COMPANY GRAHAM EXPLORATION GRAHAM RESOURCES INC. Graham Royalty Ltd. 11/93 DOMININ OKLA TEXAS EXPL & PROD, Graham-McCormick Oil/Gas Ptnrshp 1988 * SNYDER OIL PARTNERS LP Grand Banks Corp. RANGE PROD. CO. Grand Isle Oil & Gas XTO ENERGY Granite Falls Rock, Inc. CONOCOPHILLIPS Granite Operating Co. APACHE CORP.

34 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Graridge Crop. 1966 * TOTAL E&P USA INC Grayhawk Energy Inc CHESAPEAKE EXPLORATION LLC Grayhill Exploration Co. 1986 U.S. MINERALS EXPLORATION CO. GREAT AMERICAN RESOURCES, INC. Great Basins Petroleum Co. HESS CORPORATION Great Expectations Oil Co. 1984 BP AMERICA Great Lakes Energy Development, Inc. HIGHMOUNT EXPLORATION & PRODUC- Great Lakes Energy Partners LLC RANGE RESOURCES - APPALACHIA, Great Plains Development CONOCOPHILLIPS GREAT RIVER OIL & GAS CORP. Great Western Exploration GREAT WESTERN ONSHORE INC. GREAT WESTERN OFFSHORE INC. Great Western Oil & Gas Inc. 1989 GREAT WESTERN OFFSHORE INC. Great Western Oil & Gas Inc. 1989 GREAT WESTERN ONSHORE INC. Greenwood Holdings Inc. 10/93 HEADINGTON INVESTMENTS, INC. Greystone Sligo Holsings Inc CHESAPEAKE EXPLORATION LLC Greystone Petroleum LLC CHESAPEAKE EXPLORATION LLC Griffin Petroleum Corp. 1982 KAISER-FRANCIS OIL CO. GROVE OIL & GAS GS Oil & Gas Co. 1985 see Dominion Exploration & Production Guardian Oil Co. 1916 Shell Oil Co. Guardian Oil Co. 1983 * PATRICK PETROLEUM CO, GULF CANADA RESOURCES LTD. Gulf Coast Acquisition Properties SUNDOWN ENERGY INC. Gulf Energy & Minerals Co. CHEVRON CORP Gulf Energy Development Corp. 1988 TEJAS GAS CORP. GULF EXPLORATION CONSULTING, INC. Gulf Oil Co. 1984 CHEVRON CORP. Gulf Oil Exploration & Production Co. CHEVRON CORP. Gulf States WESTERN Gulf States Production Company YUMA EXPL AND PROD CO., INC. Gulfstar Energy Inc. RANGE ENERGY CORP. Gulftex Oil Company (Merger) IMPERIAL OIL COMPANY Gunsmoke Enegy DIAMOND S ENERGY COMPANY GW Petroleum Inc. 1989 GREAT WESTERN ONSHORE INC. GWP Inc. 1989 GREAT WESTERN ONSHORE INC. GWR Operating Co. 1989 GREAT WESTERN ONSHORE INC. Gypsy Oil Co. CHEVRON CORP H.B. Zachry GASOLINE PRODUCTION CORP. H. Conquat LONGHORN OIL & GAS CO. H.R. Smith WESTERN

35 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

H.W. Bass & Sons, Inc. GOLIAD OIL & GAS CO. HADSON CORPORATION Hadson Gas Co. APACHE CORP. Hallwood Energy Co. CHEVRON CORP. Hallwood Operating Co. CHEVRON CORP. Hallwood Petroleum Inc. CHEVRON CORP. Hamilton Bros. Oil Co. BHP PETROLEUM (AMERICAS) INC. Hamilton Oil 1928 CONOCOPHILLIPS Hampton Operating Company HAMPTON RESOURCES CORP. Hampton Resources Corporation HAMPTON RESOURCES CORP. Hancock il & Gas 1958 CONOCOPHILLIPS Hanlon-Boyle Inc. 1962 see Dominion Exploration & Production HANNA PETROLEUM CO. Hanover Management Co. HESS CORPORATION Hanover Pet Inc. 1987 Rocky Mtn Prop Only ENERGEN RESOURCES CORP. Harbour Gas & Oil Inc. 1988 PETROHAWK PROPERTIES, LP HarCor Exporation, Inc. (HCX) 1989 HARCOR ENERGY, INC. HARDY OIL & GAS USA, INC. HARKEN ENERGY CORP. Harken Oil & Gas Inc. CABOT OIL & GAS CORP. Harkins & Company (Acq.) ANADARKO E&P COMPANY, LP Harp Ltd. 1986 TRITON MINERALS & ROYALTY, INC. Harper Oil Co. MCN EXPLORATION Harper Oil Co. 1986 APACHE CORP. Harris-Bianchi-Hewitt H-B-H EXPLORATION CO. Harrison J.S. ABERCROMBIE MINERAL CO. Hartex-Anadarko Permian Basin Partnership EOG RESOURCES, INC. HASSIE HUNT EXPLORATION COMPANY Hastings Resources 1987 PETROHAWK PROPERTIES, LP Hathaway Co. PYRAMID OIL CO. Hawkins & Co. ANADARKO E&P COMPANY, LP Hawthorne Oil & Gas Corp. 1988 AMERICAN NATIONAL PETROLEUM CO. H-B-H EXPLORATION CO. HCG ENERGY CORP. HCW Inc. 1985 NRM ENERGY LIMITED PARTNERSHIP HCW Oil & Gas Co. NRM ENERGY LIMITED PARTNERSHIP HEADINGTON INVESTMENTS, INC. Healdton Oil & Gas Co. 1929 EL PASO E&P COMPANY, LP HEC La Plata, LLC CHEVRON CORP HEC Peru, LLC CHEVRON CORP HEC Petroleum, Inc. CHEVRON CORP

36 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Hef-Lin Energy L L & B COMPANIES HelmericH & Payne, Inc. CIMAREX ENERGY CO. Helmick Oil Co. 1912 Shell Oil Co. Hemingway, Bartell & Associates BARTELL EXPLORATION Henderson Petroleum Corp. 1986 ZG ENERGY CORP. Henry Energy Corp. 1987 KIMCO ENERGY CORP. Henry Equity LLC LINN ENERGY HOLDINGS, LLC Henry Savings LP LINN ENERGY HOLDINGS, LLC Henry Savings Management LLC LINN ENERGY HOLDINGS, LLC HEP OIL CO LTD SILVER CREEK RESOURCES, LLC HEP OPERATING PARTNERS, L.P. HEP Partners, LP CHEVRON CORP HEP Pure Acquisitions, LLC CHEVRON CORP HEP San Juan, LLC CHEVRON CORP Heritage Glacier Park Company CONOCOPHILLIPS Heritage Resources CO, LLC HIGHMOUNT EXPLORATION & PRODUC- Herman G. Kaiser KAISER-FRANCIS OIL CO. Hershy Oil Corp. (US Properties) see Dominion Exploration & Production HESS CORPORATION Hess Oil & Chemical 1969 HESS CORPORATION Hexagon Oil & Gas, Inc. DABB ENERGY CO. Heyser & Heard EXXON MOBIL CORP. L.P. Hiawatha Oil & Gas Corp. 1987 * CASTLE ENERGY CORP. Hiawatha Oil Co., Inc. 1983 PLAINS RESOURCES, INC. Hickory Creek Oil Co. 1984 HANNA PETROLEUM CO. Hickory Timbers Oil LP XTO ENERGY INC. Hiland Energy Partners, LLC HILAND PARTNERS HOLDINGS LLC Hiland Operating, LLC HILAND PARTNERS HOLDINGS LLC Hiland Partners, LLC HILAND PARTNERS HOLDINGS LLC High Crest Oils, Inc. BP AMERICA High Plains Oil Corp. 1985 DEVON ENERGY Highland Energy Co. CALPINE PRODUCER SER., LP HIGHLAND RESOURCES, INC. Highmount Black Warrior Basin LLC WALTER BLACK WARRIOR BASIN LLC HighMount Midwest Energy LLC LINN OPERATING, INC. HighMount Exploration and Production Michi- ENERVEST LTD Hightower Oil & Gas OLIX ENERGY Hilliard Oil & Gas Inc. 1985 GRAHAM RESOURCES INC. Hingeline-A1162Overthrust Oil/Gas, Inc. WHITING PETROLEUM CORP. HiPoint Petroleum Corp. 1981 GIBRALTAR EXPLORATION LTD. HLP Operating Co. 1986 HPC OPERATING CO.

37 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

HMG Associates NATURAL RESOURCE MGMT CORP. HNG Fossil Fuels Co. 1983 EOG RESOURCES, INC. HNG Offshore Properties, Inc. EOG RESOURCES, INC. HNG Oil Co. 1985 EOG RESOURCES, INC. HNG/InterNorth Exploration Co. 1986 EOG RESOURCES, INC. HOC 1982 Rockies Oil Program see Dominion Exploration & Production Hold Oil Corp. 1989 HCG ENERGY CORP. Holding Company, Ltd. GLOBAL NATURAL RESOURCES CORP. Holly Energy, Inc. 1984 EOG RESOURCES, INC. Homa Oil and Gas Company Inc. FOREST OIL PERMIAN CORP. Home Petroleum Corp. 1989 PRESIDIO OIL CO. Home-Stake O&G Co. ENCORE OPERATING, LP Home-Stake Royalty Corp. ENCORE OPERATING, LP Hondo Oil & Gas Co. 1963 BP AMERICA Hondo Oil & Gas Co. 1992 DEVON ENERGY Honolulu Oil Corp. 1961 * BP AMERICA Hoover & Bracken Energies, Inc. DIVERSIFIED ENERGIES INC. Houston Drilling & Energy Corp. 1977 HOUSTON OIL & ENERGIES INC. Houston Natural Gas Production Co. 1972 EOG RESOURCES, INC. HOUSTON OIL & ENERGY, INC. Houston Oil & Minerals 1981 DEVON ENERGY Houston Oil Co. 1956 BP AMERICA Houston Oil Fields Co. 1987 * PLAINS RESOURCES, INC. Houston Oil Royalty Trust DEVON ENERGY Houston Oil Trust DEVON ENERGY Howell Petroleum Co. ANADARKO E&P ONSHORE LLC HPC OPERATING CO. HPC, INC. See PRESDIO OIL CO. HS Resources Inc. - 2001 KERR-MCGEE ROCKY MOUNTAIN HS Royalty Ltd ENCORE OPERATING, LP Hudson Gas & Oil EXXON MOBIL CORP. LP Hudson Oil Co. BP AMERICA Hudson's Bay Oil & Gas Co. DOME PETROLEUM Huffco Gas & Oil Inc. 1988 TOTAL E&P USA INC Huffco Oil Programs Inc. 1988 TOTAL E&P USA INC Huffco Petroleum Corp. 1988 TOTAL E&P USA INC Huffington Exploration Corp. 1988 TOTAL E&P USA INC Hughes Eastern Producing, Inc. UNION OIL CO. OF CALIFORNIA Hughes Oil & Gas Inc. 1989 TEXAS MERIDIAN RESOURCES LTD Hugoton Capitol Limited Partnership PIONEER NATURAL RESOURCES USA, HUGOTON ENERGY CORPORATION

38 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Hugoton Exploration Corporation CHESAPEAKE EXPLORATION LLC Hugoton Production Co. 1969 PIONEER NATURAL RESOURCES USA, Huisache Operating Co. 1977 PENINSULA RESOURCES CORP. Humble Oil & Refining Co. 1972 EXXON MOBIL CORP L.P. Humble Oil Co. 1917 EXXON MOBIL CORP L.P. Humphreys Corp. 1931 BP AMERICA Hunnicutt & Camp Co. 1981 see Tenneco Inc HUNT OIL COMPANY Hunt Petroleum (AEC) Inc XTO ENERGY INC. Hunt Petroleum Corporation XTO ENERGY INC. HUNTER RESOURCES, INC. Huntington Beach Company CHEVRON U.S.A. INC. Huntley & Huntley Energy Exploration LLC OLYMPUS ENERGY, LLC Husky Oil Co. 1984 MARATHON OIL COMPANY HUSKY OIL LTD HYDRO GULF OF MEXICO, LLC Hytech Energy Corp. 1979 ANADARKO E&P COMPANY, LP I.W. Lovelady 1978 * DEVON ENERGY Ibex Inc. BRECKENRIDGE OPERATING CO. IEC Oil & Gas Corp. 1987 HEADINGTON INVESTMENTS, INC. Ike Lovelady, Inc. 1986 PETROHAWK RESOURCES CO. ILEX OIL CORP. Illinois Industries Inc. 1985 TRANS ATLANTIC RESOURCES CORP. Imperial American Energy 1977 * FREEPORT-MCMORAN ENERGY PTNRS Imperial Oil Company of California IMPERIAL OIL COMPANY Imperial Petroleum MOSS PETROLEUM Incomare Resources, Inc. KERRCO INC. Independent Exploartion Co. 1952 TESORO PETROLEUM CORP. Independent Oil & Gas Co. 1927 CONOCOPHILLIPS Independent Resources, Inc. ACCESS ENERGY CORP Indian Oil Company CANAAN ENERGY CORPORATION Indian Territory Illuminating Oil Co. OCCIDENTAL OIL & GAS CORPORATION Indian Valley Oil Co. (Merger) IMPERIAL OIL COMPANY Indian Wells Oil Co. 1979 * ANADARKO E&P COMPANY, LP OIL & Indian Wells Oil Co. 1987 PARKER & PARSLEY PETROLEUM CO. Industrial Gas Supply Corp. ENTERPRISE RESOURCES INC. Inexco Oil Company CONOCOPHILLIPS Ingram Oil & Refining Co. 1961 MURPHY OIL CORP. Integral Petroleum Corp. 1976 BUTTES OIL & GAS CO. Integrated Energy, Inc. MCO RESOURCES CORP. Inter-American Petroleum Corp. 1978 GRAHAM RESOURCES INC.

39 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

InterCoast Oil & Gas Co. KCS RESOURCES, INC. Intercoastal Operating Co. IOC EXPLORATION, INC. International Min. & Chemical Corp. 1986 BASF CORP/WINTERSHALL CORP. International Nuclear Corp. INEXCO OIL CO. International Paper Co. CHEVRON MIDCONTINENT, LP International Paper Gas Pipeline Co. CHEVRON MIDCONTINENT, LP International Petr. Resources Corp. 1972 PACIFIC ENERPRISES OIL CO. (USA) InterNorth Inc., E&P Division EOG RESOURCES, INC. Intex Oil Co. 1968 TESORO PETROLEUM CORP. Intratex Gas Co. EOG RESOURCES, INC. Inveco Holding, Inc. KERRCO INC. Investors Royalty Co., Inc. 1973 PACIFIC ENERPRISES OIL CO. (USA) IOC EXPLORATION, INC. Iowa/Illinois Gas & Electric Co. MID-AMERICA ENERGY CO. IP Petroleum Co., Inc. CHEVRON MIDCONTINENT, LP IRION MOUNTAIN OIL CO. Iron Sights Operating Inc CHESAPEAKE EXPLORATION LLC Island Oil & Exploration Co., Inc. PENROSE PRODUCTION ITR Petroleum, Inc. 1987 GENERAL ATLANTIC ENERGY CORP. IWG Co 5 KCS RESOURCES, INC. J M HUBER CORP. J. C. Trahan Drilling Co. TEXAS INTERNATIONAL PETROLEUM J. D. WRATHER, JR. J.E. Crosbie, Inc. 1951 KERR-MCGEE CORP J.M. Guffey Petroleum Co. 1907 CHEVRON J.P. Owen 1963 CONOCOPHILLIPS J.R. Parten Estate FARMERS OIL COMPANY J.S. ABERCROMBIE MINERAL CO. J & D Petro, Inc. WILHELM RESOURCES, INC. Jade Resources, Inc. 1991 CONSOLIDATED OIL & GAS, INC. Jaeger Energy Corp. 1984 U.S. RESOURCES INC. Jay Oil Company FOREST OIL PERMIAN CORP. Jay Petroleum Inc CHESAPEAKE EXPLORATION LLC Jefferson Lake Sulphur Co. OCCIDENTAL OIL & GAS CORPORATION JEM Petroleum Corp. 1985 PATRICK PETROLEUM CO, Jeremiah Corp. OCTOBER OIL CO. Jergins Oil Co. EXXON MOBIL CORP. Jerry Chambers Exploration Co. KERR-MCGEE CORP Jerry Chambers Exploration Co. AXEM RESOURCES, INC. Jet Oil Co. SOUTHWEST ROYALTIES INC. US OIL JMG Oil & Gas CHAPARRAL ENERGY INC.

40 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

J-O'B OPERATING CO. Jocelyn-Varn Oil Co. VARN OIL CO. John A. Bell, Jr. 1917 BP AMERICA John A. Taylor Co. 1983 PLAINS RESOURCES, INC. John G. Hammons Inc. JGM COMPANY JOHN P. MCNAUGHTON Johnson Oil & Refining Co. 1956 CONOCOPHILLIPS Johnson Oil & Gas Co. CHEVRON CORP. Johnston Ranch Royalty Co. HESS CORPORATION Jonell Gas MCO RESOURCES, INC. Jones & Pellow Oil Co. 1987 * BOGERT OIL CO./LOUIS DREYFUS GAS Jones-O'Brian J-O'B OPERATING CO. JOSEPH B. SINGER OIL COMPANY managed by AVIVA Journey Oil and Gas JETTA APPLACHIAN COMPANY JR Operating Inc. GREAT LAKES ENERGY PARTNERS LLC Julian Potter Estate 1969 ILEX OIL CORP. Juniper Oil & Gas 1967 DAMSON OIL CORP. JUPITER CORP. J-W OPERATING CO. K. Jain & Associates VENEX CORP. K.R.M. Exploration, Inc. 1973 K.R.M. PETROLEUM CORP. K.R.M. PETROLEUM CORP. K. Stewart Petroleum CHESAPEAKE EXPLORATION LLC Kaiser Energy Inc. 1987 PRESIDIO OIL CO. Kaiser Oil (U.S.) Lrd. 1984 PLAINS PETROLEUM CO. Kaiser-Francis Anadarko Limited Partnership GBK INVESTMENTS, LLC Kaiser-Francis Anadarko, LLC GBK INVESTMENTS, LLC Kaiser-Francis Gulf Coast, Ltd GBK INVESTMENTS, LLC Kaiser-Francis Gulf Coast, LLC GBK INVESTMENTS, LLC Kaiser-Francis Mid-Continent, LLC GBK INVESTMENTS, LLC Kaiser-Francis Mid-Continent Limited Part- GBK INVESTMENTS, LLC Kalispell Glacier Park Company CONOCOPHILLIPS KANATA EXPLORATION OF WESTERN Kaneb Oil & Gas Co. ANADARKO E&P COMPANY, LP Keneb Operating Co., Ltd. 1988 * ANADARKO E&P COMPANY, LP Kanex, Ltd. KERRCO INC. Kansas-Nebraska Natural Gas 1983 PLAINS PETROLEUM CO. Kathol Petroleum, Inc. ANADARKO E&P COMPANY, LP Katz Oil DALEN RESOURCES OIL & GAS CO. Kaycee Exploration Ltd. 1974 PACIFIC ENERPRICES OIL CO. (USA) KCS Medallion Resources, Inc. KCS RESOURCES, INC.

41 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

KCS Michigan Resources, Inc. KCS RESOURCES, INC. KCS Mountain Resources, Inc. KCS RESOURCES, INC. KCS RESOURCES, INC. Keaton Oil & Gas Co. 1929 ASHLAND OIL CO. Keba Oil & Gas Co. 1983 WHITING PETROLEUM CORP. KEC Acquisition Corp. see Dominion Exploration & Production Kee Exploration Inc. 1986 WICHITA RIVER OIL CO. Keith Collins Petroleum Corp. 1985 GOLD KING CONSOLIDATED, INC. Keith Oil Co. c1920 BP AMERICA Kelley Oil Corp SAMSON Kellogg Oil Co. 1915 BP AMERICA Kelso Fund 81 Trust GLOBAL NATURAL RESOURCES CORP. Kelso Funs 83-A Trust GLOBAL NATURAL RESOURCES CORP. Kelso-Lambert Royalty Co., Inc. GLOBAL NATURAL RESOURCES CORP. Kelso-Lambert Royalty Fund 1981 GLOBAL NATURAL RESOURCES CORP. Kelso-Lambert Royalty Pool 1983-A GLOBAL NATURAL RESOURCES CORP. Kenai Oil & Gas Inc. 1984 GRAHAM RESOURCES INC. Kennedy Mitchel, Inc. 1986 HARKEN OIL & GAS INC. Keoghan-Hurst Drilling Co. 1928 CONOCOPHILLIPS Kerlyn Oil Co. 1946 KERR-MCGEE CORP. Kern County Land Co. 1967 see Tenneco Inc Kerr, Jain & Associates VENEX CORP. KERRCO INC. Kerrco, Ltd. KERRCO INC. KERR-MCGEE CORP. ANADARKO PETROLEUM CORPORA- Kerr-McGee North Am. Onshore Corp.-1996 DEVON ENERGY CORP. KERR-MCGEE OIL & GAS ONSHORE, LP Kerr-McGee Oil Industries 1965 KERR-MCGEE CORP. Kerr-McGee Refining Corporation CALUMET LUBRICANTS Kerr-McGee Refining Coporation (Oklahoma NATURAL GAS CLEARINGSHOUSE KERR-MCGEE ROCKY MOUNTAIN CORP. ANADARKO PETROLEUM CORPORA- Kewanee Industries 1977 CHEVRON Key Oil Company 1976 TOTAL E&P USA INC KEY PRODUCTION COMPANY Keystone, Inc. KEYSTONE O&G TX (WY)(LA)(MULTI- KFOC, INC. KIMCO ENERGY CORP. Kimmerer Oil CHEVRON King Ranch Oil & Gas, Inc. 1988 * PRESIDIO OIL CO. King Ranch, Inc. ST. MARY LAND & EXPLORATION, INC. King Resources Co. 1978 TEXAS INTERNATIONAL PETROLEUM

42 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Kingbell Oil Co. 1912 Shell Oil Co. King-Stevenson Gas & Oil Co. 1965 TEXAS INTERNATIONAL PETROLEUM Kingwood Oil Co. 1971 ANADARKO E&P COMPANY, LP Kirby Exploration Company of Texas see Dominion Exploration & Production Kirby Fletcher Stamford see Dominion Exploration & Production Kirby Oil & Gas Co. 1957 see Dominion Exploration & Production Kirby Petroleum Co. 1943 * CONOCOPHILLIPS Kirby Petroleum Co. 1988 * see Dominion Exploration & Production KISKA OIL CO. KLS Holdings KERRCO INC. KN Energy Inc. 1985 PLAINS PETROLEUM CO. Koch Hydrocarbons ONEOK Koch Oil Co. (50%) FLINT HILLS REOURCES LP Koch Oil Co. (50%) KOCH INDUSTRIES INC. Koch, Fred C. KOCH EXPLORATION COMPANY, LLC Koch, Mary R. KOCH EXPLORATION COMPANY, LLC Koch Development Corporation KOCH EXPLORATION COMPANY, LLC Kodiak Oil & Gas (USA) Inc WHITING OIL AND GAS CORPORATION KP Exploration Inc. 1993 UMC PETROLEUM CORP. KSA Industries 1974 ADAMS RESOURCES & ENERGY, INC. K-T Oil Corporation 1982 TOTAL E&P USA INC L & G Oil & Royalty Co. HESS CORPORATION L L & B COMPANIES L L & B Resources L L & B COMPANIES L. G. Williams Oil Co. 1984 MATRIX ENERGY INC. L. Noble NOBLE ENERGY, INC. OIL CORP. LaClare Petroleum Inc. 1985 THE MERIDIAN RESOURCES CORPORA- Ladd Petroleum Corp. (Merger) ANADARKO E&P COMPANY, LP LAE Energy, Inc. PETROHAWK RESOURCES CO. LaGloria Oil & Gas 1957 NOBLE ENERGY, INC. Lagorce Oil Co. 1969 APACHE CORP. Laguna Petroleum OXY USA WTP Laird Oil & Gas, Inc. 1972 WAINOCO OIL CORP. Lambert Exploration, Inc. GLOBAL NATURAL RESOURCES CORP. Lamson & Bennett LAMSON/ONSHORE PETROLEUM CORP. LAMSON/ONSHORE PETROLEUM CORP. Landa Oil Co. HESS CORPORATION LANTERN PETROLEUM CORPORATION LaPlata Associates, LLC CHEVRON MIDCONTINENT, LP Larcon Oil Co. HESS CORPORATION Largo Drilling & Exploration Corp. 1972 TRANSCONTINENTAL OIL CO.

43 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Lariat Petroleum NEWFIELD EXPL MID-CONTINENT INC. LARIO OIL & GAS CO. Laser Oil Co. KERR-MCGEE CORP LASMO ENERGY CORP. LATERRE DEVELOPMENT CORP. Latigo Petroleum., Inc. (wholly owned subsid- PLAINS EXPLORATION & PRODUCTION Laurel Royalty Co. 1972 PACIFIC ENERPRISES OIL CO. (USA) LAVINO OIL & GAS CO. Lawton Oil EL PASO E&P CO., LP Le Norman Loco, Inc NOBLE ENERGY, INC Le Norman Partners, LLC NOBLE ENERGY, INC Leader Development Corp. 1987 CLINTON GAS SYSTEMS, INC. Lear Petroleum Corp. 1988 DALEN RESOURCES OIL & GAS CO. Lear Petroleum Prtnrs Operating Co. 1986 ENERGEN RESOURCES CORP. Leben Oil Corp. KAISER-FRANCIS OIL CO. LeCuno Oil Corp. HESS CORPORATION Lee M. Bass, Inc. LMBI O&G TX (WY)(LA)(MULTI-STATE) Leede Exploration Co. 1978 CONOCOPHILLIPS Leidy Prospecting Co. 1953 CHEVRON LENORMAN ENERGY CORP. Leonard Oil see Tenneco Inc Lewcinda Oil & Gas Co. 1917 CONOCOPHILLIPS Lewis Production CHEVRON Liberty North America, Inc. 1988 PRESIDIO OIL CO. Liberty Oil & Gas Corp. 1988 * PRESIDIO OIL CO. Limark Corporation NORTHSTAR OPERATING CO. Limited Oil Co. 1936 EXXON MOBIL CORP. Limpia Royalty 1962 CHEVRON Lindenmuth and Associates L L & B COMPANIES Lind Oil & Gas Company COMANCHE RESOURCES COMPANY Lindy Petroleum Co. 1982 PATHFINDER PETROLEUM CORP. LINGEN OIL & GAS INC. Link Energy, LLC PLAINS ALL AMERICAN PIPELINE, LP Linn Energy Holdings, LLC RIVIERA UPSTREAM, LLC Linn Operating, LLC RIVIERA OPERATING, LLC Lion Oil Co. 1955 LION OIL TRADING & TRANSPORTA- Lion Oil Company LION OIL TRADING & TRANSPORTA- Lion Oil Refining Company 1945 LION OIL TRADING & TRANSPORTA- LION OIL TRADING & TRANSPORTATION, Lipan Oil Co. ENCANA ENERGY Logan & Barton CHARLIE BARTON

44 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Lomak Energy Co. RANGE ENERGY I, INC. Lomak Energy Services Co. RANGE ENERGY SERVICES CO Lomak Gas Co. RANGE GAS CO Lomak Gathering & Pros. Co. RANGE GATHERING & PROS. CO Lomak Offshore LP RANGE OFFSHORE LP Lomak Operating Co. GREAT LAKES ENERGY PARTNERS LLC Lomak Petro. (Ohio) Inc. GREAT LAKES ENERGY PARTNERS LLC Lomak Petroleum Inc. RANGE RESOURCES CORP. Lomak Pipeline Systems LP RANGE PIPELINE SYSTEMS LP Lomak Production Co. RANGE PRODUCTION CO. Lomak Production I LP RANGE PRODUCTION I LP Lomak Resources Co. GREAT LAKES ENERGY PARTNERS LLC Lomak Resources LLC RANGE RESOURCES LLC Lomita Gasoline Company CHEVRON U.S.A. INC. Lone Star Production Co. NEWFIELD EXPLORATION GULF Long-Bell Petroleum Company, Inc. CHEVRON MIDCONTINENT, LP Longhorn Oil & Gas WAGNER & BROWN, LTD. Longview Energy General Partners Inc. LONGVIEW ENERGY COMPANY Longview Gas Company LONGVIEW ENERGY COMPANY Longview Production Company LONGVIEW ENERGY COMPANY Lorena Oil Co. CHEVRON Los Angeles Oil & Refining Co. 1915 BP AMERICA Los Nietos Co. 1959 CHEVRON CORP. Lou-Can Oil & Gas, Inc. FRONTIER ENERGY CORP. Louis Dreyfus Natural Gas Corp. DOMINION EXPLOR. & PROD., INC. Louisiana Land & Exploration Co CONOCOPHILLIPS Louisiana Minerals, Ltd. PETER PAUL PETROLEUM CO., GEN. Louisiana-Hunt Petroleum HUNT PETROLEUM CORPORATION Love Petroleum Co. SOUTHWEST ROYALTIES, INC. LPI Acquisition Inc. RANGE ACQUISITION INC. LPI Operating Co RRC OPERATING CO LRF Corp RANGE RESOURCES - APPALACHIA, LUCK PETROLEUM CORP. LVO Corp. 1974 ANADARKO E&P COMPANY, LP Lyco Energy Corporation ENERPLUS RESOURCES (USA) CORP. M & M Production see Tenneco Inc M.R. YOUNG MacDonald Oil Corp. 1975 DEVON ENERGY Madison Pipe Line Company FARMERS OIL COMPANY Madiion Resources 1985 DEVON ENERGY MAGIC CIRCLE ENERGY CORP.

45 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Magic Circle Oil Co. 1980 MAGIC CIRCLE ENERGY CORP. Magna Oil Corp. HESS CORPORATION Magness Petroleum Co. SAMSON PROD SERVICES COMPANY Magnolia Petroleum Co. 1959 EXXON MOBIL CORP. Magnum-Hunter Production, Inc. CIMAREX ENERGY CO Maguire Energy Company MAGUIRE OIL COMPANY MAGUIRE OIL COMPANY Mainland Oil & Minerals, Inc. MAINLAND RESOURCES, INC. MAINLAND RESOURCES, INC. Majestic Resources, Inc. 1981 ALTA ENERGY CORP. Malco Refining BP AMERICA Malka Production Co. 1978 CONOCOPHILLIPS Mallon Oil Co. BLACK HILLS GAS RESOURCES, INC. MAPCO, Inc. 1985 see Dominion Exploration & Production Maplewood Glacier Park Company CONOCOPHILLIPS MAPP Exploration Inc. 1983 BELCOR, INC. Marathon Oil Co. 1982 MARATHON OIL COMPANY MARATHON OIL COMPANY Marathon Petroleum Co. MARATHON OIL COMPANY MARINE PROPERTIES, INC. MARINER ENERGY, INC APACHE CORP. Marion Corp. 1987 * DEVON SFS OPERATING, INC. Mark Resources Corp. RANGE RESOURCES CORP. Marland Oil Co. 1929 CONOCOPHILLIPS Marline Petroleum Corp. 1985 DEVON ENERGY Marrs McLean 1931 * BP AMERICA MARTIN EXPLORATION CORP. Maryland Oil Corp. see Tenneco Inc Masai Minerals, Ltd. HESS CORPORATION Mason Minerals LLC CAMINO NATURAL RESOURCES, LLC Masters Energy Corp. 1986 HARKEN OIL & GAS INC. Matador Petroleum Co. 1922 Shell Oil Co. Matador Petroleum Corp. ENCANA OIL & GAS USA, INC. MATADOR RESOURCES CO. Matagorda Bay Pipeline, Inc. see Dominion Exploration & Production Matagorda Drilling & Expl. Co. 1982 CONVEST ENERGY CORP. Matagorda Island Development Corp. 1992 ANADARKO PETROLEUM CORPORA- Matagorda Island Exploration Corp. 1992 ANADARKO PETROLEUM CORPORA- Matagorda Pipeline Partnership see Dominion Exploration & Production MATRIX ENERGY INC. Maverick Consulting Co. KFOC, INC.

46 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Maxus Energy Company MIDGARD ENERGY COMPANY Maxus Exploration Company MIDGARD ENERGY COMPANY May Energy Partners 1987 QUINOCO CO. May Petroleum Inc. 1987 * ENERGY DEVELOPMENT PARTNERS Mayfair Minerals, Inc. see Tenneco Inc Maynard Oil Co. FOREST OIL CORP. Maynard Oil Co. - Southern Oklahoma Prop- LAMAMCO DRILLING CO. Mayo FRAZIER Maze Energy Corporation see Dominion Exploration & Production Maze Exploration, Inc. see Dominion Exploration & Production Maze-A 1983 Limited see Dominion Exploration & Production MB Operating Co Inc. GREAT LAKES ENERGY PARTNERS LLC McAlester Fuel Co. 1983 UNIMAR CORP. McClure Oil 1960 MARATHON OIL COMPANY McColl-Frontenac Oil Co., Ltd. 1948 CHEVRON McCollum Exploration Co. WESTERN GEOPHYSICAL MCCRARY, AN OKLAHOMA LP mangaged by AVIVA McCulloch Energy, Inc. HARKEN ENERGY COMPANY McCulloch Oil & Gas Corp. UMC PETROLEUM CORP. McCulloch Oil Corp. of Texas UMC PETROLEUM CORP. MCFARLAND ENERGY INC. McFarlane Oil Co., Inc. GLOBAL NATURAL RESOURCES CORP. McGowen Exploration Co. 1984 PLAINS PETROLEUM CO. McGrath & Smith See Smith & McGrath McKee Petroleum Corp. 1976 EXXON MOBIL CORP. McMan Oil & Gas Co. 1931 BP AMERICA McMoRan Oil & Gas Co. 1981 FREEPORT-MCMORAN INC. MCN Energy Enterprises SUNDOWN ENERGY INC. MCN EXPLORATION MCN Investment Corp SUNDOWN ENERGY INC. MCN Oil & Gas Co. SUNDOWN ENERGY INC. MCNIC Enhanced Prod SUNDOWN ENERGY INC. MCNIC Midcontinent Properties SUNDOWN ENERGY INC. MCNIC Oil & Gas Midcontinent, Inc. SUNDOWN ENERGY INC. MCNIC Oil & Gas Properties SUNDOWN ENERGY INC. MCNIC Oil and Gas Company SUNDOWN ENERGY INC. MCO Resources, Inc. UMC PETROLEUM CORP. MCOR Oil & Gas Corp. 1980 UMC PETROLEUM CORP. MC Panhandle Inc. CHESAPEAKE EXPLORATION LLC McPet 1971 APACHE CORP. MCR Oil Corp. of Texas 1980 UMC PETROLEUM CORP.

47 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

McRae Consolidated Oil & Gas, Inc. 1983 DALEN RESOURCES OIL & GAS CO. McRae Oil & Gas CHEVRON MDF Technology, Inc. CONOCOPHILLIPS MDU Resources Group Inc. FIDELITY OIL CO. Meadowview, Inc. see Dominion Exploration & Production Medallion TRANSAMERICAN NATURAL GAS CORP. MEDALLION CALIFORNIA PROPERTIES Medallion Gas Services, Inc. KCS RESOURCES, INC. Medallion Production Co. KCS RESOURCES, INC. Medicine Bow Operating Co. EL PASO E&P COMPANY, LP Memorial Resource Development Corp RANGE RESOURCES LOUISIANA, INC Mendota Oil Co. 1969 APACHE CORP. Merger Corporation 1948 Henderson Clay Products Meridian Aggregates Company CONOCOPHILLIPS Meridian Gold Company CONOCOPHILLIPS Meridian Industrial Minerals Co. CONOCOPHILLIPS Meridian Minerals Company CONOCOPHILLIPS Meridian Oil Co CONOCOPHILLIPS Meridian Oil Frontera CONOCOPHILLIPS Meridian Oil Gathering Inc. CONOCOPHILLIPS Meridian Oil Inc. (Wisconsin) CONOCOPHILLIPS Meridian Oil Marketing CONOCOPHILLIPS Meridian Oil Offshore Acquisition Co. CONOCOPHILLIPS Meridian Oil Offshore Inc. CONOCOPHILLIPS Meridian Oil Pipeline Inc. CONOCOPHILLIPS Meridian Oil Production Inc. CONOCOPHILLIPS Meridian Oil Production Inc. (Wisconsin) CONOCOPHILLIPS Meridian Oil Services Inc. CONOCOPHILLIPS Meridian Oil Storage CONOCOPHILLIPS Meridian Oil Trading Inc. CONOCOPHILLIPS Meridian Oil Transportation Inc. CONOCOPHILLIPS Meridian Petroleum Holding Inc. CONOCOPHILLIPS Meridian Power Inc. CONOCOPHILLIPS Merlin Petroleum Co. 1989 * GULF EXPL CONSULTANTS INC. Merrico Acquisition 1987-NYL Merrit Oil 1928 CONOCOPHILLIPS Mesa Limited Partnership * PIONEER NATURAL RESOURCES USA, Mesa Operating Co. PIONEER NATURAL RESOURCES USA, Mesa Petroleum Co. PIONEER NATURAL RESOURCES USA, MGF Drilling Co. KAISER-FRANCIS OIL CO. MGF Mansfield, Inc. KAISER-FRANCIS OIL CO.

48 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

MGF Oil Corp. 1/94 KAISER-FRANCIS OIL CO. MGF Production Co. KAISER-FRANCIS OIL CO. MGF Supply Co. KAISER-FRANCIS OIL CO. MGS Development Co. SUNDOWN ENERGY INC. Mid Louisiana Gas Company 1987 BASF CORP/WINTERSHALL ENERGY MID-AMERICA ENERGY CO. Mid-American Investment Corporation see Dominion Exploration & Production Mid-American Petroleum, Inc 1986 HUNTER RESOURCES, INC. MidCon Exploration Co.-Gulf Coast 1986 DAVIS OIL CO. (DAVIS PETRO CORP.) MidCon Exploration Co.-Gulf Coast 1986 APACHE CORP. Midcontinent Acquisition Properties SUNDOWN ENERGY INC. Mid-Continent Petroleum Corp. 1955 SUNOCO PARTNERS MKTG & TERMI- Middle Bay Oil Co., Inc. PXP GULF COAST, INC. Middle States Petroleum 1958 see Tenneco Inc MIDGARD ENERGY COMPANY Mid-Gulf Drilling Corp. RANGE ENERGY CORP. Midhurst Oil Corp. ASHLAND OIL CO. Mid-Kansas Oil & Gas Co. 1916 MARATHON PETROLEUM CO. Midland Oil Company 1961 CONSOLIDATED OIL & GAS, INC. Midlands Energy Co. 1984 FREEPORT-MCMORAN INC. Mid-Tex Oil & Gas GROVE OIL & GAS Midway Oil Co. 1905 DEVON SFS OPERATING, INC. Midway Six Oil Co. 1910 BP AMERICA Midwest Exploration Co. 1930 BP AMERICA Midwest Oil Co. 1974 BP AMERICA Midwest Production Co. 1958 see Dominion Exploration & Production Midwest Refining Co. 1921 BP AMERICA Midwest Resources, Inc. MID-AMERICA ENERGY CO. MILAGRO EXPLORATION Mile High Properties Inc. LONGVIEW ENERGY COMPANY Miles Petroleum Inc OXFORD CONSOLIDATED, INC. Milestone Petroleum, Inc. 1985 CONOCOPHILLIPS Millane, Inc. (Assets) IMPERIAL OIL COMPANY OF CALIFOR- Millican Oil Co. ANADARKO E&P COMPANY, LP Minatome Corp. 1987 Name Change Only ENERGEN RESOURCES CORP. Minden Oil & Gas Inc. 1985 CASTLE ENERGY CORP. Minnehoff Oil Co. 1912 Shell Oil Co. Minnehoma Oil Co. CHEVRON Mission Development CHEVRON Mission E & P, LP PETROHAWK PROPERTIES, LP Mission Holdings, LLC PETROHAWK PROPERTIES, LP

49 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

MISSION RESOURCES PARTNERS LP Mission Resources Corp. PETROHAWK PROPERTIES, LP Mission Resources Inc. 1987 MISSION RESOURCE PTNR LP Mississippi River Corp. NATURAL GAS & OIL MISSOURI RIVER LP managed by AVIVA Mistal, Inc. TOTAL E&P USA INC Mitchell & Mitchell Gas & Oil Corp. 1971 DEVON ENERGY Mitchell Energy DEVON ENERGY MKI ENERGY, INC. Mobil Oil Corporation EXXON MOBIL CORPORATION Mobil Seeligson SUNOCO PARTNERS MKTG & TERM- Mobil-GC EXXON MOBIL CORPORATION Moha Petroleum Okla., Inc. CHESAPEAKE ORC, LLC Mohawk Petroleum PETER BOSCH Monarch Royalty Corp. 1959 DEVON ENERGY MONCRIEF OIL INTERESTS Monday Oil Co. 1946 CHEVRON Monsanto Company 1972 LION OIL TRADING & TRANSPORTA- Monsanto Oil Co. 1986 BHP PETROLEUM (AMERICAS) INC. Montana Power Co. ENCANA ENERGY Montara Petroleum Co. NORD-MONTARA PETROLEUM CO. Monte Carlo Exploration Inc. REBEL EXPLORATION INC. Montecito Corp. FORCHALL OIL Montejas Energy Resources, Inc. 1984 SEAHAWK OIL INTERNATIONAL, INC. Monterey Oil Co. 1960 EXXON MOBIL CORP. Montex Exploration Co. 1957 see Dominion Exploration & Production Montoya Oil Co. 1952 FELMONT OIL CORP. Moore McCormack Energy, Inc. 1988 NEXEN PETROLEUM U.S.A. INC. MORAINE PRODUCTION LTD. Moran Energy Inc. 1984 ANADARKO E&P COMPANY, LP Morgan Development, Inc. KERR-MCGEE CORP. Morgan Gulf Co. BP AMERICA Morgan Resources, Inc. KERR-MCGEE CORP. Mormac Energy Corp. 1983 ENCINO ENERGY & DEV CORP. Moseley Petroleum Co. HESS CORPORATION MOSS PETROLEUM Mound Co. 1963 * BHP PETROLEUM (AMERICAS) INC. Mountain & Plains Oil Co. 1980 DEVON ENERGY Mountain Front RANGE RESOURCES Mountain Fuel Supply 1985 QUESTAR CORP. Mountain States Oil Co. 1919 CONOCOPHILLIPS

50 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Moxa Energy Corp. 1984 ILEX OIL CORP. M-R Holdings Acquisition Company CONOCOPHILLIPS M-R Holdings Inc. CONOCOPHILLIPS M-R Holdings Inc. No 1 CONOCOPHILLIPS M-R Holdings Inc. No 2 CONOCOPHILLIPS M-R Holdings Inc. No 3 CONOCOPHILLIPS M-R Holdings Inc. No 4 CONOCOPHILLIPS M-R Holdings Inc. No 5 CONOCOPHILLIPS M-R Holdings Inc. No 6 CONOCOPHILLIPS M-R Holdings Inc. No 7 CONOCOPHILLIPS MRD Operating LLC RANGE LOUISIANA OPERATING, LLC MRT Exploration Co. 1983 ANADARKO E&P COMPANY, LP Mt. Diable Corp. 1964 CHEVRON MTrust Corp., N.A. AMERITRUST TEXAS, N.A. Multistates Oil Properties PIONEER NATURAL RESOURCES USA, Murchison Trusts 1957 see Dominion Exploration & Production Murphy Oil Company CHEVRON U.S.A. INC. MURPHY OIL CORP. Murvale Company/Murvale Oil Company CHEVRON U.S.A. INC. Muskeg Oil Co. BP AMERICA Mutual Oil Co. 1928 CONOCOPHILLIPS MW Petroleum Corp. APACHE CORP. MWJ Producing Co. OCOTILLO MWJR Petroleum Corp. APACHE CORP. N.G. Penrose PENROSE PRODUCTION CO. NABORS DRILLING USA, LP NAFCO Oil & Gas, Inc. CHEVRON NANCE PETROLEUM CORPORATION Nanome Aggregates Inc. CONOCOPHILLIPS NARECO Corporation GLOBAL NATURAL RESOURCES CORP. Nat Hunter Producing Co. 1931 BP AMERICA National Energy Group, Inc. SANDRIDGE ENERGY, INC. National Exchange, Inc. CONOCOPHILLIPS NATIONAL FUEL GAS CO. National Oil Co. 1974 Shell Oil Co. National Oil Co. 1985 FREEMONT ENERGY CORP. National Petroleum Co. 1915 BP AMERICA National Petroleum Corp. of Tampa 1960 MURPHY OIL CORP. Natol Petroleum Corp. DAMSON OIL CORP. Natomas Co. 1983 MAXUS ENERGY CORP. Natomas North America MAXUS EXPLORATION

51 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Natomas North America APACHE CORP. NATURAL GAS & OIL Natural Gas and Oil Corporation * TOTAL E&P USA INC Natural Gas Clearinghouse TARGA RESOURCES Natural Gas Producing Co. 1983 EXXON MOBIL CORP. Natural Reserves Inc. 1984 AMERICAN RESOURCES INC. Natural Resource Management Corp Sandridge Energy Natural Resources Corp. of Texas GLOBAL NATURAL RESOURCES CORP. Natural Resources Corporation GLOBAL NATURAL RESOURCES CORP. Navarro Oil Co. CONOCOPHILLIPS Navidad Oil & Gas Co. BOLTEX OIL & GAS CO. NCI-Shawnee, LP PETROHAWK PROPERTIES, LP Neely & Neely IRION MOUNTAIN OIL CO. NEG Oil & Gas LLC SANDRIDGE ENERGY, INC. Nelson Petroleum Co. SAMSON PROD SERVICES COMPANY NELSON R. THOMAS NERCO OIL & GAS NEUMIN PRODUCTION CO. New Britain, Ltd PETER PAUL PETROLEUM CO., GEN. New York Life Oil & Gas Production Partner- see Dominion Exploration & Production Newfield Exploration Mid-continent Inc. ENCANA COPORATION Newfield Exploration, INC. ENCANA COPORATION Newmark Resources 1977 TRINITY RESOURCES, INC. NEWMONT OIL CO. Newmont Mining Corporation 1988 * EXXON MOBIL CORP. NFC Petroleum Corp. KAISER-FRANCIS OIL CO. NGC Energy Company 1989 DALEN RESOURCES OIL & GAS CO. NIKLOS OIL & GAS CO. Niklos Oil & Gas Co. 1987 see Dominion Exploration & Production Ninian Oil Co. 1989 see Dominion Exploration & Production Ninian Oil Finance Corp. HIGHMOUNT EXPLORATION & PRODUC- Ninian Oil Holding Company see Dominion Exploration & Production Noarko Resources Inc. 1986 WICHITA RIVER OIL CO. Noble Energy Production, Inc. NOBLE ENERGY, INC. Noble Energy, Inc. CHEVRON U.S.A. INC. Nor-Am Exploration Corp. RED EAGLE RESOURCES CORP. Noram Petroleum, L.L.C. CHAPARRAL ENERGY, L.L.C. NORD-MONTARA PETROLEUM CO. Nordon Oil Corp. 1969 TEXAS INTERNATIONAL PETROLEUM Norfitt FINA OIL & CHEMICAL CO. Norfolk Energy Inc. 1993 UMC PETROLEUM CORP.

52 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

NORMANDY OIL & GAS CO. Nortex Gas & Oil Co. 1983 EOG RESOURCES, INC. North American Oils Consolidated 1950 CONOCOPHILLIPS North American Resources Corp. ENCANA ENERGY NORTH AMERICAN ROYALTIES, INC. North Block Gas AVEN GAS & OIL, INC. North Central Oil Corp. PLAINS EXPLORATION & PRODUCTION North Star JOHN P. MCNAUGHTON North Timbers Oil, LP XTO ENERGY INC. Northeast Energy Development Corp. GREAT AMERICAN RESOURCES, INC. Northern Michigan Exploration Co. NEWFIELD EXLP MID-CONTINENT INC. Northern Natural Gas Co., E&P Division EOG RESOURCES, INC. Northern Plains Railroad Company CONOCOPHILLIPS Northern Rockies Pipe Line Co. CONOCOPHILLIPS Northlander Oil Company 1974 TOTAL E&P USA INC NORTHSTAR OPERATING CO. NORTHSTAR RESOURCES, INC. Northwest Energy 1983 WILLIAMS EXPLORATION CO. Northwest Exploration Company 1986 * TOTAL E&P USA INC (50%) Northwest Production Corporation CONOCOPHILLIPS Norwalk Oil Co. 1950 CONOCOPHILLIPS Nova Petroleum Corp. 1985 NOVA RESOURCE, INC. NOVA RESOURCE, INC. Noyly Development Co. 1953 CHEVRON NRM ENERGY LIMITED PARTNERSHIP NRM Operating Company, L.P. NATURAL RESOURCE MGMT CORP. NRM Petroleum Corp. NATURAL RESOURCE MGMT CORP. Nucorp Energy Inc. BRIDGE OIL COMPANY, L.P. Nuevo Energy Corp. PLAINS E & P CO. NUGGET OIL CORP. NUMAC RESOURCES Nu-West Dvlpmt. (U.S. Assets) 1984 * FREEPORT-MCMORAN Nu-West Dvlpmt. (U.S. Assets) 1984 * TRANSCO EXPLORATION PARTNERS Nylife Resources Inc. see Dominion Exploration & Production O'Connell Holdings, LLC BLACK STONE ENERGY COMPANY, LLC O.A. Sutton 1962 CHEVRON O.G.I. Oil & Gas, Inc. 1984 DEVON ENERGY OCCIDENTAL OIL & GAS CORP. OCCIDENTAL PERMIAN LP (SEE OXY) OCCIDENTAL TRANSACTION 1, LLC OCEAN DRILLING & EXPLORATION CO.

53 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Ocean Energy Inc. (Houston) DEVON ENERGY PROD. CO, LP Ocean Oil & Gas OCEAN DRILLING & EXPLORATION CO. Oceana Exploration Co LC VICTORY ENERGY PARTNERS LLC Oceanic Oil PRODUCING PROPERTIES Ocelot Oil Co. EOG RESOURCES, INC. OCOTILLO OCTOBER OIL CO. Odessa Natural Corp. CONOCOPHILLIPS Odessa Natural Gasoline Company CONOCOPHILLIPS Odessa Pipeline Company CONOCOPHILLIPS Odyssey Energy Inc. 1984 TRAFALGAR HOUSE OIL & GAS INC. Odyssey Petroleum Co. PETROHAWK PROPERTIES, LP Odyssey Petroleum Company HAMPTON RESOURCES CORP. Offshore Exploration Oil Co. OXOCO INC. Ohio L & M Co., Inc. 1988 ALLIANCE PETROLEUM CORP. Ohio Oil Co. 1962 MARATHON PETROLEUM CO. Oil & Gas Properties CHEVRON Oil Center Operating Inc. PENT ENERGY, LLC OIL CITY PETROLEUM INC. Oil Development Co. of Texas 1978 DEVON SFS OPERATING, INC. Oil Development Co. of Utah 1978 DEVON SFS OPERATING, INC. Oil Drilling, Inc 1963 DEVON ENERGY Oil State Petroleum Co. 1922 EL PASO E&P COMPANY, LP Oilman's Properties, Inc. ALAMEDA ENERGY, INC. Oklahoma Natural Gas Co. ONEOK EXPLORATION CO. Oklahoma Pacific, Ltd. PETER PAUL PETROLEUM CO., GEN. Old Dominion Oil Corp. 1983 RATEX RESOURCES INC. Old Maynard Corporation FOREST OIL PERMIAN CORP. Old Ocean Oil Co. 1954 BP AMERICA Oleum Incorporated MAXUS EXPLORATION Olin Oil & Gas Corp. 1962 EXXON MOBIL CORP. OLIX ENERGY Olix Industries, Inc. 1981 DEVON ENERGY Olsen & Jal SUNOCO PARTNERS MKTG & TERM- Olympia Drilling Programs 1980 MAGIC CIRCLE ENERGY CORP. One Liberty Oil Co. 1988 PIONEER NATURAL RESOURCES USA, ONEOK Beta Co. TXOK ENERGY RESOURCES CO. ONEOK Energy Resources Co. TXOK ENERGY RESOURCES CO. ONEOK Exploration Co. CHESAPEAKE ORC, LLC ONEOK Resources Co. CHESAPEAKE ORC, LLC ONEOK Exploration Co. 1980 ONEOK EXPLORATION CO.

54 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Onshore Exploration LAMSON/ONSHORE PETROLEUM CORP. Onyx Oil Co. 1981 DEVON ENERGY Orbit Energy, Inc. ORBIT PETROLEUM, INC. ORIGINALA PETROLEUM CORP. Orion 1981 Royalty Fund, Ltd. GLOBAL NATURAL RESOURCES CORP. Orion Louisiana Royalty Fund GLOBAL NATURAL RESOURCES CORP. Orion Petroleum, Inc. GLOBAL NATURAL RESOURCES CORP. Orion Petroleum, Ltd. GLOBAL NATURAL RESOURCES CORP. ORS CORP. Oryx Energy Company KERR-MCGEE CORP. ONSHORE LP Osage Milestone Petroleum CONOCOPHILLIPS Osage Oil Co. CONOCOPHILLIPS Osage Oil Co. 1901 OCCIDENTAL OIL & GAS CORPORATION Osmond Oil Company 1968 Dissolved TOTAL E&P USA INC Overland Energy, Inc. 1983 EAGLE EXPLORATION CO. Overthrust Resources, Ltd. 1986 POLARIS RESOURCES, INC. Owl Petroleum Co. 1986 ANADARKO E&P COMPANY, LP OXFORD CONSOLIDATED, INC. Oxley Petroleum CHESAPEAKE ORC, LLC OXOCO INC. OXY RESOURCES CALIFORNIA, LLC OXY USA INC. OXY USA WTP, LP P & O Oil Corp. 1980 CONOCOPHILLIPS Pacific Energy Investments, Inc. KERR-MCGEE CORP. Pacific Energy Investments, N.V. KERR-MCGEE CORP. Pacific Energy Ventures KERR-MCGEE CORP. Pacific Enterprises ABC Corp. PEC MINERALS, LP Pacific Enterprises Oil & Gas HUNT OIL COMPANY Pacific Enterprises Oil Co. (USA) HUNT OIL COMPANY Pacific Enterprises Roy. Co. 1990 PACIFIC ENTERPRISES OIL CO. (USA) Pacific Enterprises Royalty Company SABINE ROYALTY TRUST Pacific Federal Ventures KERR-MCGEE CORP. Pacific Lighting Oil & Gas 1987 PACIFIC ENTERPRISES OIL & GAS Pacific Oil & Gas Development Corp. CALLON PETROLEUM CO. Pacific Union TEXAS AMERICAN OIL CORP. Pacific Western Oil Corp. 1956 CHEVRON Packaging Research Corporation 10/93 HEADINGTON INVESTMENTS, INC. Paladin Petroleum Corp. 1987 * ENERGY DEVELOPMENT PARTNERS Palm Petroleum Corp. DAMSON OIL CORP. Palmer Oil Co. see Tenneco Inc

55 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Pan American Petroleum Corp. BP AMERICA Pan Ocean Oil Corp. 1976 MARATHON PETROLEUM CO. Pan Oil Co. 1972 DAMSON OIL CORP. PanCanadian Energy Corp. ENCANA CORP. PanCanadian Energy Holdings, Inc. ENCANA ENERGY HOLDINGS, INC. PanCanadian Energy Resources, Inc. ENCANA ENERGY RESOURCES, INC. Pan Canadian Energy Services Inc. ENCANA ENERGY SERVICES INC. PanCanadian Gulf of Mexico, Inc. ENCANA GULF OF MEXICO PanCanadian Heritage Lands ENCANA HERITAGE LANDS PanCanadian Midstream, Inc. ENCANA MIDSTREAM INC. PanCanadian Midstream, Ltd. ENCANA MIDSTREAM, LTD PANCANADIAN PETROLEUM CO. PanCanadian Resources ENCANA RESOURCES PanEnergy Field Services, Inc. DUKE ENERGY FIELD SERVICES, INC. Pan Energy Transport and Trading Co. TEPPCO CRUDE OIL LP Pangea Petroleum Co. 1987 HARCOR ENERGY, INC. Panhandle Eastern Exploration Co. 1987 ANADARKO PETROLEUM CORPORA- Panhandle Oil Corp. 1956 TOTAL E&P USA INC Pantano WESTERN Panterra Petroleum NANCE PETROLEUM CORP. panther energy company EAGLE ENERGY ACQUISITIONS LP/ Paova Oil Co. 1912 Shell Oil Co. Paraffine Oil Co. EXXON MOBIL CORP. Paraffine Oil Corp. 1981 WILLIAMS EXPLORATION CO. Parallel Petroleum Corporation PARALLEL PETROLEUM LLC Park Oil & Gas Inc. MARTIN EXPLORATION CORP. Parker & Parsley Petroleum Co. PIONEER NATURAL RESOURCES USA, Parker Oil ANADARKO E&P COMPANY, LP Parrent Oil & Gas 1983 QUADRANT RESOURCES INC. Parris Oil Co. 1912 Shell Oil Co. Parsley Energy PIONEER NATURAL RESOURCES USA, Parten Operating Inc. FARMERS OIL COMPANY PARTNERS OIL CO. Pasco Oil Properties 1975 BP AMERICA Pate Oil Co. 1959 EXXON MOBIL CORP. PATHFINDER PETROLEUM CORP. Patina BNR Corporation NOBLE ENERGY, INC. Patina Oil & Gas Corporation NOBLE ENERGY, INC. Patina Oklahoma Corp. NOBLE ENERGY, INC. Patina San Juan Incorporated NOBLE ENERGY, INC. PATRICK PETROLEUM CO.

56 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Patrick Petroleum Co. 1984 * ANADARKO E&P COMPANY, LP Patrick Petroleum Corp. UNIT PETROLEUM CORP. Patrick-Bayou Resources UNIT PETROLEUM CORP. (50%) Patrick-Bayou Resources NEWFIELD EXPL MID-CONTINENT INC. Pauley Petroleum Inc. 1987 HONDO OIL & GAS CO. Pauline P Lambe KOCH EXPLORATION COMPANY, LLC Pax Investment Corp. HESS CORPORATION P'Bell Energy Co. SUNDOWN ENERGY INC. PCTC - Oregon, Inc. CONOCOPHILLIPS PCTC - Skykomish, Inc. CONOCOPHILLIPS PCTC, Inc. CONOCOPHILLIPS PCU Inc. of Texas 1985 LUCK PETROLEUM CORP. Peachtree Production Co. PLAINS RESOURCES, INC. Peake Petroleum Co. 1964 EL PASO E&P COMPANY, LP Pecos Company CONOCOPHILLIPS Pecos Exploration ANADARKO E&P COMPANY, LP Peerless Oil & Gas PRIMARY FUELS, INC. Peerless Oil Corporation 1966 Pel-Tex Co., Inc. 1986 FREEPORT-MCMORAN Pelto Oil Co. 1989 ENERGY DEVELOPMENT CORP. Pend Oreille Oil & Gas Corp. SAMSON PROD SERVICES COMPANY PENINSULA RESOURCES CORP. PENN VIRGINIA CORP. Penn Virginia MC Energy, LLC PENN VIRGINIA CORP. Pennmark Operating Company PENNMARK RESOURCES COMPANY Pennmark Production Company ELAND ENERGY, INC. PENNMARK RESOURCES COMPANY Penntex Petroleum Co. CHEVRON Pennzenergy DEVON ENERGY Pennzoil Exploration & Prod. Co. DEVON ENERGY Pennzoil Producing Co. DEVON ENERGY PENROSE PRODUCTION CO. PENT ENERGY, LLC Permian Basin Trust CONOCOPHILLIPS Permian Resources Holding Inc. CHESAPEAKE EXPLORATION LLC Perot Family Trust BRIDGE OIL COMPANY, L.P. Perry R. Bass, Inc. CHISHOLM TRAIL VENTURES, LP Perry R. Bass, Trustee BMT O&G (WY)(LA)(MULTI-STATE) L.P. PETER BOSCHE Petex-Wiser Corporation THE WISER OIL CO. Petra Resources, Inc 1986 MUSTANG RESOURCES CORP.

57 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Petro Gas Producing Company 1978 TOTAL E&P USA INC Petro Search Alpha Ltd. Series 1973-l HESS CORPORATION Petro Search Exploration Corp. HESS CORPORATION PETRO SOURCE PARTNERS LTD. Petro-Atlas 1958 TOTAL E&P USA INC PETRO-CANADA RESOURCES USA INC. PetroCorp Acquisition Co. UNIT CORP. Petrocorp, Inc. UNIT CORP. Petrodel Exploration, Inc. 1988 PETROFINA DELAWARE, INCORPO- Petro-Dynamics, Inc. 1973 HESS CORPORATION PETROFINA DELAWARE, INCORPORATED Petrofina Exploration, Inc. 1985 TOTAL E&P USA INC PETROFINA GAS PIPELINE COMPANY Petrofina Trading Service, Lt. 1987 TOTAL E&P USA INC Petrohawk Energy Corporation BPX PRODUCTION COMPANY Petrohawk Properties LP BHP BILLITON PETROLEUM PROPER- Petroleum Corp. of Texas DAMSON OIL CORP. Petroleum Corp. of Texas 1984 BRECKENRIDGE OPERATING CO. Petroleum Development Corp (Dallas) 1986 PRESIDIO OIL CO. Petroleum Exploration THE WISER OIL CO. Petroleum Exploration, Inc. 1964 PIONEER NATURAL RESOURCES USA, Petroleum Resources Company 9/94 BISON ENERGY CORP. Petroleum Technical Services FOREST OIL CORP. Petro-Lewis Corp. 1987 FPCO OIL & GAS CO. PETROMARK RESOURCES CO. Petrominerals Corp. 1986 MCFARLAND ENERGY INC. PetroTide, Ltd. PETER PAUL PETROLEUM CO., GEN. PetroTiger I, II, III, Ltd. PETER PAUL PETROLEUM CO., GEN. PetroVentures Expl. Co. SUNDOWN ENERGY INC. Petrus Oil Company BRIDGE OIL COMPANY, L.P. Peyton Oil & Gas, Inc. PEYTON HOLDINGS CORP. Peyton Holdings Corp. PEYTON ROYALTIES, LP PG&E Resources Company DALEN RESOURCES OIL & GAS CO. Phillips Oil Co. CONOCOPHILLIPS Phillips Petroleum Co. CONOCOPHILLIPS Phoenix Oil Co. 1901 OCCIDENTAL OIL & GAS CORPORATION PHOENIX OPERATING CO. Phoenix Resources Co. 1982 TEXAS INTERNATIONAL PETROLEUM Phoenix Resources, Inc. 1987 ENERGEN RESOURCES CORP. PICKENS ENERGY CORPORATION Pickens Financial Group, Ltd. PICKENS ENERGY CORPORATION

58 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Pickens Resource Corp. PICKENS ENERGY CORPORATION Piedmont Petroleum SOUTHWESTERN PRODUCTION CORP. Pierce Petroleum Corp. c.1930 BP AMERICA Pilgrim Drilling Co. KAISER-FRANCIS OIL CO. Pilgrim Exploration Corp. AMERICAN ENERGY EXPLORATION Pin Oak Petroleum, Inc. BRIDGE OIL COMPANY, L.P. Pinaga Inc. 1986 PIONEER NATURAL RESOURCES USA, Pincher Creek Ranch CONOCOPHILLIPS PIONEER NATURAL RESOURCES USA INC. Pioneer Oil Company CHEVRON U.S.A. INC. Pioneer Production Corp. 1986 PIONEER NATURAL RESOURCES USA, Pittencreiff America, Inc TALISMAN ENERGY USA INC Placer Energy Corp. EAGLE OIL & GAS CO Placid Oil Co. OCCIDENTAL Plains Exploration & Production Company FREEPORT-MCMORAN OIL AND GAS PLAINS MARKETING, LP Plains Petroleum Co. WILLIAMS PRODUCTION RMT CO PLAINS RESOURCES, INC. Planet Oil & Mineral Corp. 1975 PACIFIC ENERPRISES OIL CO. (USA) PLANTATION PETROLEUM ACQUISITION Platco Corp. 1967 TEXAS INTERNATIONAL PETROLEUM Plateau Petroleum, Inc. 1984 DEVON ENERGY Plato DEVON ENERGY Plaza Petroleum Inc. 1973 BROCK EXPLORATION CORP. Plum Creek Timber Company CONOCOPHILLIPS Plymouth Oil Co. 1962 MARATHON OIL COMPANY PMOG Holdings, Inc. RANGE RESOURCES Pogo Energy, Inc. PLAINS EXPLORATION & PRODUCTION Pogo Panhandle 2004, LP PLAINS EXPLORATION & PRODUCTION Pogo Producing (Texas Panhandle) Co. PLAINS EXPLORATION & PRODUCTION POLARIS RESOURCES INC. Pollack Petroleum Inc. 1984 HARCOR ENERGY, INC. Polumbus Co. SAMSON PROD SERVICES COMPANY Poppy Oil Co. 1954 CONOCOPHILLIPS Porta-Bello, Inc. 1981 RATEX RESOURCES INC. Posse Petroleum, Ltd. PETER PAUL PETROLEUM CO., GEN. Post Petroleum Co., Inc. 1988 * PRESIDIO OIL CO. Potestas Corporation CHESAPEAKE EXPLORATION LLC Power Resources 1985 NOVA RESOURCE, INC. PPPCo.One Oil Company, Ltd. PETER PAUL PETROLEUM CO., GEN. Prado Oil Co. 1965 DALEN RESOURCES OIL & GAS CO.

59 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Prairie Oil & Gas Co. 1932 BP AMERICA Prairie Producing Company UNION OIL CO. OF CALIFORNIA Precise Exploration Corp. 1973 BROCK EXPLORATION CORP. Presidio Exploration PRESIDIO OIL COMPANY PRESIDIO OIL CO. Presidio Operating Co. E.E. NEARBURG Presidio West Virginia PRESIDIO OIL COMPANY Preston Oil HUNT PETROLEUM (AEC), INC. Prima Energy Corp. PETRO-CANADA RESOURCES USA INC Prima Oil & Gas Co. PETRO-CANADA RESOURCES USA INC PRIMARY FUELS, INC. Primary Natural Resources, Inc. NEWFIELD EXPLORATION MID- Princeville Corporation 1977 CONSOLIDATED OIL & GAS, INC. Pine Mountain RANGE RESOURCES Prize Energy MAGNUM-HUNTER RESOURCES, INC. Prochemco HESS CORPORATION Producers & Refiners Corp. 1934 BP AMERICA Producers Oil Co. 1917 CHEVRON PRODUCING PROPERTIES Program Acquisition Co. PETROHAWK PROPERTIES, LP Progress Petroleum Shell Oil Co. Proton Energy, Inc. PETROHAWK PROPERTIES, LP PRS Offshore, Inc. CHEVRON MIDCONTINENT, LP Prudential Drilling Co. 1986 NEXEN PETROLEUM U.S.A. INC. Prudential Minerals Exploration Corp. SAMSON PROD SERVICES COMPANY Prudential Minerals Inc. CONOCOPHILLIPS Prudential Oil & Gas Co. 1987 NEXEN PETROLEUM U.S.A. INC. Prudential-Bache (Partial Buyout) 11/93 DOMINION OKLA. TEXAS EXPLOR. & PSEC, Inc. CHESAPEAKE ORC, LLC Pubco Petroleum Corp. 1973 PIONEER NATURAL RESOURCES USA, Publishers Petroleum 1979 CONOCOPHILLIPS Pure Oil Co. 1965 CHEVRON CORP. Pure Resources, LP CHEVRON MIDCONTINENT, LP PXP GULF COAST, INC. PYRAMID OIL CO. PYRO ENERGY CORP. QUADRANT RESOURCES INC. Quaker Oil Co. 1919 ASHLAND OIL CO. Quanah Petroleum Inc. 1983 DEVON ENERGY QUEENSTOWN OIL AND GAS, INC. managed by AVIVA QUEENSTOWN ROYALTY COMPANY LP managed by AVIVA

60 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

QUEENSTOWN ROYALTY II LP managed by AVIVA Questa Oil & Gas Co. UNIT CORPORATION Questar Corp. QEP ENERGY COMPANY Questar Exploration & Production QEP ENERGY COMPANY Quinoco Petroleum, Inc. 1989 CHEVRON Quinstar Oil Inc. 1984 PLAINS PETROLEUM CO. Quintana Petroleum Corp. (LA Properties) CONOCOPHILLIPS Quintana Petroleum Corp. (TX Properties) HILCORP ENERGY COMPANY Quintuple Oil Co. 1912 Shell Oil Co. R. Hailey CONOCOPHILLIPS R.W. Fair Foundation 1975 * TOTAL E&P USA INC R.L. Burns Corp. 1981 PYRO ENERGY CORP. R.T. Collier Corp. 1957 CHEVRON CORP. Rainbow Pipe Line Company FARMERS OIL COMPANY Rainbow Resources, Inc. 1978 WILLIAMS EXPLORATION CO. Ralph Nix Oil Co. RALPH NIX, A PARTNERSHIP RALPH NIX, A PARTNERSHIP RAM Energy, Inc. Halcon Holdings, Inc. RAM Energy, LLC OVAL ENERGY LLC Romarco, Inc. WILHELM RESOURCES, INC. Ramco Operating Co. RAM ENERGY INC Ramco-NYL 1987 Ltd. Part. RAM ENERGY INC RANGE ENERGY I, INC. RANGE ENERGY SERVICES CO. RANGE GAS CO RANGE GATHERING & PROS. CO RANGE OFFSHORE LP Range Operating Co. GREAT LAKES ENERGY PARTNERS LLC RANGE PIPELINE SYSTEMS LP RANGE PRODUCTION CO RANGE RESOURCES CORP. Range Resources Dev. Corp. GREAT LAKES ENERGY PARTNERS LLC RANGE RESOURCES LLC Ranger FRAZIER RATEX RESOURCES, INC. RB Operating Inc. RAM ENERGY INC RDH Enterprices Inc CHESAPEAKE EXPLORATION LLC Reading & Bates, Inc. 1988 RAM ENERGY INC Reading Minerals Co. GLOBAL NATURAL RESOURCES CORP. Real Petroleum BHP PETROLEUM (AMERICAS) INC. Reb Petroleum 1980 CAYMAN RESOURCES CORP.

61 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

REBEL EXPLORATION INC. REBELLION ENERGY, LLC CAMINO NATURAL RESOURCES, LLC Red Diamond Oil Co. see Tenneco Inc Red Eagle Exploration Co. 1987 RANGE RESOURCES - APPALACHIA, Red Eagle Resources Corp. RANGE RESOURCES - APPALACHIA, RED ROCK ROYALTY LP managed by AVIVA Redfern Oil Co. 1970 KERR-MCGEE CORP. Redstone Oil & Gas NEWFIELD EXPL MID-CONTINENT INC. Reef Energy 1987 GENERAL ENERGY RES & TECH CORP. Reef Petroleum Corp. SAMSON PROD SERVICES COMPANY Regal Oil 1954 CONOCOPHILLIPS Reichhold Energy Corp. 1985 BP AMERICA Reily Oil MARTIN EXPLORATION CORP. Reiter-Foster BARUCH-FOSTER CORP. RELIANCE ENTERPRISES, INC. Reliance Oil Co. 1917 EXXON MOBIL CORP. Reno Oil Co. 1953 see Tenneco Inc Renwar Oil Corp. 1960 see Tenneco Inc Republic Natural Gas Co. 1961 EXXON MOBIL CORP. Republic Petroleum Corp. 1949 CONOCOPHILLIPS Research Applications Inc. CONOCOPHILLIPS RESERVE INDUSTRIES INC. Reserve Oil & Gas Co. 1980 CHEVRON Reserve Oil & Minerals Corp. 1987 RESERVE INDUSTRIES INC. RESOLUTE ENERGY, INC. REVC Holdco, LLC RANGE HOLDCO, INC. R-H Holdings Corporation CONOCOPHILLIPS Rial Oil Co. 1980 SAGE ENERGY CO. Riata Energy, Inc. SANDRIDGE ENERGY, INC. Richardson & Bass BASS ENTERPRISES PRODUCTION CO. Richardson Petroleum see Tenneco Inc Richfield Oil Corp. 1966 BP AMERICA Ridgeway Exco Inc. 1985 TAURUS PETROLEUM INC. Ridgeway Oil Expl. & Dvlpmt. Corp. 1985 TAURUS PETROLEUM INC. Riner Exploration Corp. 1983 TEXON ENERGY CORP. Rio Grande Oil Co. 1937 BP AMERICA RIO PETROLEUM INC. Risk Exploration, Inc. KISKA OIL CO. Rival Resources Inc. QUESTA OIL & GAS CO. River Corporation 1973 * TOTAL E&P USA INC 55% RIVER PIPELINE COMPANY

62 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

River States Oil Co. 1960 MURPHY OIL CORP. RLP Gulf States, LLC HLP GULF STATES LLC RME Petroleum ANADARKO E&P COMPANY, LP RMR, Inc. 1989 TEXACO TPC, INC. Robert M. Bass RMB O&G TX (WY)(LA)(MULTI-STATE) Roberts & Koch - Permian RDR ENERGY, LLC Roberts & Koch - Permian & SE New Mexico FOREST OIL PERMIAN CORP. Roberts Petroleum 1963 CRYSTAL OIL CO. Rock Hill Oil Co. 1955 CHEVRON Rock Island Refining Corporation 1989 MARATHON OIL COMPANY Rock Island Oil and Refining CO, Inc. KOCH EXPLORATION COMPANY, LLC ROCKET OIL & GAS COMPANY LP managed by AVIVA Rockhill HOMA OIL & GAS CO. Rocky Mountain Energy ANADARKO E&P COMPANY, LP Rocky Mountain Ventures, Inc. 1973 G/O INTERNATIONAL, INC. Roden Oil Co. 1972 EOG RESOURCES, INC. RODMAN-NOEL OIL CORP. ROLAND LIBERDA Root Petroleum Corp. 1947 BP AMERICA Rosario Resources ANADARKO E&P COMPANY, LP ROSCOE GAS & OIL CO. ROSEWOOD RESOURCES INC. Rosser & Pendleton M.R. YOUNG Rowan Oil SUNOCO PARTNERS MKTG & TERMI- Roxana Petroleum Corp. 1928 Shell Oil Co. Roxoil Drilling, Inc. 1946 DEVON ENERGY Royal Petroleum Corp. 1974 KERR-MCGEE CORP. Royalty Ventures Corp. 1985 APACHE CORP. Roytex Oil Co. 1950 DEVON ENERGY RRC OPERATING CO. RDT Properties, Inc. MID-CON ENERGY OPERATING, INC. Rusk County Transporting Systems Inc. GLOBAL NATURAL RESOURCES CORP. RVO Petroleum Co. 1981 CHEVRON Rycade Oil Co. ASHLAND OIL CO. Rycade Oil Corp. Shell Oil Co. S.A.M. Royalty CHESAPEAKE ORC, LLC S.J.F. Corp. 1984 DEVON ENERGY S.W. Blount BOUNTY PRODUCTION CO. Sabine Corp. PACIFIC ENERPRISES OIL CO. (USA) Sabine Exploration Corp. FREEPORT-MCMORAN ENERGY PTNRS Sabine Production Co. PACIFIC ENTERPRISES OIL CO. (USA)

63 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Sabine Royalty Corp. 1977 PACIFIC ENTERPRISES OIL CO. (USA) Sack Properties, Inc. (Assets) IMPERIAL OIL COMPANY OF CALIFOR- SAGE ENERGY CO. Salt Done Production Co. 1956 MARATHON OIL COMPANY Saltmount Oil Co. 1951 BP AMERICA Salton Riviere Inc. 1976 EOG RESOURCES, INC. Sam Wilson see Tenneco Inc Samedan Oil Corp. NOBLE ENERGY, INC. Samoset Petroleum Co. 1915 Shell Oil Co. SAMSON RESOURCES Samson Redbud, LLC SAMSON LONE STAR, LLC San Jacinto Petroleum Corp. 1958 CONOCOPHILLIPS San Jacinto EXXON MOBIL CORP. San Juan Basin Trust CONOCOPHILLIPS San Juan Oil Co. 1952 CONOCOPHILLIPS San Salvador Dev. Co., Inc. BLACKSTONE MINERALS CORP. Sanchez Energy MESQUITE ENERGY Sand Springs Oil and Gas TOKLAN OIL AND GAS CORP. SANDRIDGE ENERGY, INC Sandy Ridge Oil Co., Inc. 1983 VAN FOSSAN OIL ASSOCIATES Sanguine, Ltd. DOMINION EXPLORATION MIDCONTI- Sanguine, Ltd. SANGUINE GAS EXPLORATION, LLC Santa Fe Energy Co. 1989 DEVON ENERGY Santa Fe Energy Operating Partners, L.P. DEVON ENERGY Sante Fe Energy Resources, Inc. DEVON ENERGY SANTA FE MINERALS, INC. Santa Fe Snyder Corp. DEVON ENERGY Santa Fe-Andover Oil Co. 1989 SANTA FE MINERALS, INC. Santiago Oil & Gas Co. JOHN P. MACNAUGHTON Santo Resources Inc. CHESAPEAKE EXPLORATION LLC SAP Acquisition LLC CHESAPEAKE EXPLORATION LLC Saturn Gas Systems FARMERS OIL COMPANY Saxon Oil Co. 1989 CHEVRON Saxon Oil Development Partners L.P. 1989 CHEVRON Saxon Operating Co. 1989 CHEVRON Saxon Operating Partnership L.P. 1989 HEP OPERATING PARTNERS, L.P. Saxony Corporation CONOCOPHILLIPS Saxony Industries, Inc. 1984 NORMANY OIL & GAS CO. Schermerhorn Oil. Corp. CONOCOPHILLIPS Scott Oil & Gas Operations CMS ENERGY, INC. Scurlock Oil Co. ASHLAND OIL CO.

64 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Scurlock Permian Corp. ASHLAND OIL CO. Scurlock Permian Corp. PLAINS MARKETING, LP Seaboard Oil Co. 1958 CHEVRON Seagull Energy Corp. DEVON ENERGY Seagull Energy Inc. DEVON ENERGY Seagull Mid-South Inc. DEVON ENERGY Seahawk Gathering GOLIAD OPERATING COMPANY SEAHAWK OIL INTERNATIONAL, INC. Search Drilling. Co. 1989 Plains E & ) Search Energy Corp. ADVANTAGE OIL & GAS LTD. Search Exploration Inc. HARKEN ENERGY CORP. Seaside Oil Co. CONOCOPHILLIPS Seaxe Energy Corp. 1987 APACHE CORP. Sedna Energy Company FOUNDATION ENERGY MANAGEMENT Sempra Energy Production Company PEC MINERALS, LP Sempra Oil & Gas, Inc. PEC MINERALS, LP Seneca Oil Co. 1989 KAISER-FRANCIS OIL CO. SENECA RESOURCES CORPORATION Sensor Oil & Gas Co LENORMAN ENERGY CORP. Sentinel Resources Corp. 1987 RED EAGLE RESOURCES CORP. Sesquicentennial Land Co. 1987 BALBOA EXPLORATION CO. SEW Oil Corp. FINA OIL & CHEMICAL CO. SGO Petroleum Inc. DEVON ENERGY PROD. CO, LP Shaffer Oil & Refining Co. 1958 CRESCENT OIL & GAS CORP. SHALETT OIL & GAS CO. Shalett Oil Co. 1961 MARINE PROPERTIES, INC. Shallow Oil Company J.C. TRAHAN DRILLING CONTRACTOR, Shamrock Oil & Gas Corp. 1967 MAXUS ENERGY CORP. Shana Petroleum Company NEG OPERATING LLC Shell Co. of California Shell Oil Co. Shell Oil Co. SHELL WESTERN E&P INC. Shell Oil Co. 1988 (US Onshore Properties) THE MERIDIAN RESOURCES CORPORA- Shell Petroleum Co. 1938 Shell Oil Co. SHELL TRADING (U.S.) CO Shell Union Oil Corp. 1949 Shell Oil Co. SHELL WESTERN E&P INC. SWEPI, INC Shenandoah Oil Company GLOBAL NATURAL RESOURCES CORP. Shenandoah Oil Corp. 1980 CONOCOPHILLIPS Shenandoah Oil Corp. 1980 * GALAXY OIL CO. Sheridan Energy, Inc. CALPINE NATURAL GAS, LP Shield Energy, Inc. JOHN P. SHIELDS, INC.

65 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Shield Oil Co. NUMAC RESOURCES Shield Oil Corp. 1981 DI INDUSTRIES INC. Shorline FOREST OIL PERMIAN CORP. Sid R. Bass, Inc. SRBI O&G TX (WY)(LA)(MULTI-STATE) Sid R. Bass, Trustee (Sid R. Bass Mgmt. SRBMT O&G TX (WY)(LA)(MULTI-STATE) Sid Richardson Carbon & Gasoline Company SOUTHERN UNION GAS SERVICES Siebens Oil & Gas CHEVRON Sierra Exploration Co. 1985 WICHITA RIVER OIL CO. Sigmore 1983 MAXUS ENERGY CORP. Signal Oil & Gas Co. CONOCOPHILLIPS Signal Oil Co. 1912 Shell Oil Co. Siler Energy Investments, Inc. 1981 STRIKER PETROLEUM CORP. Simpson Investments, Inc. DABB ENERGY CO. Sinclair Consolidated Oil Corp. BP AMERICA Sinclair Gulf Corp. BP AMERICA Sinclair Oil Corp. 1969 BP AMERICA Sinclair Oil Refining BP AMERICA Sinco Oil Corp. 1982 STARK ENERGY INC. Sioux Oil Co. 1968 TESORO PETROLEUM CORP. Skelly Oil Co. 1977 CHEVRON SKZ Inc. 1986 ZILKHA ENERGY CO. SLAPCO EXXON MOBIL CORP. Slawson Enterprises SLAWSON EXPLORATION CO., INC. SLAWSON EXPLORATION CO., INC. Slawson Petroleum Corporation ALAMEDA ENERGY, INC. Slick Oil Co. see Tenneco Inc Slick Oil Company ASHLAND OIL INC. Smith & McGrath BENGAL OIL & GAS Smith & McGrath PRIMARY FUELS, INC. Snowden & McSweeney Co. 1944 BP AMERICA Snyder Oil Corporation DEVON SNYDER OIL PARTNERS DEVON Socal 1984 CHEVRON SOCO Wattenberg Corporation NOBLE ENERGY, INC. Socony-Mobil Oil Co. 1966 EXXON MOBIL CORP. Socony-Vacuum Oil Co. 1955 EXXON MOBIL CORP. Sohio Petroleum Co. BP EXPLORATION INC. Solar Refining Co. 1931 BP EXPLORATION INC. Sonat Exploration Co EL PASO E&P COMPANY, LP Sonora Acquisition Corp. see Dominion Exploration & Production Sooner Energy Corp. TATONKA ENERGY INC1

66 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Sotex 1961 CHEVRON Sourgasco, Inc. see Dominion Exploration & Production South Fork Oil & Gas Co. TEJAS OIL & GAS CO South Louisiana Production Co. EXXON MOBIL CORP. South Penn Oil Co. DEVON ENERGY South States Development Company see Dominion Exploration & Production South States Oil & Gas Co. 1983 see Dominion Exploration & Production South Timbers Oil LP XTO ENERGY INC. Southeastern Exploration Corp. EOG RESOURCES, INC. Southern Community Gas Co. VENUS OIL CO. Southern Crude Oil Purchasing Co. 1931 BP AMERICA Southern Mineral Corporation UNIT CORP. Southern Minerals Co. 1970 SUNOCO PARTNERS MKTG & TERMI- Southern Natural Gas EL PASO E&P COMPANY, LP Southern Petroleum Exploration, Inc. THE WISER OIL CO. Southern Production 1950 BP AMERICA Southern Union Production Co. see Supron Energy Corp. Southland Gathering Company CONOCOPHILLIPS Southland Pipeline Company CONOCOPHILLIPS Southland Royalty Co. 1985 CONOCOPHILLIPS Southport Exploration, Inc. NEWFIELD EXPL MID-CONTINENT INC. Southport Exploration, Inc. AVIVA AMERICA INC. (50%) Southport Petroleum Co. of Delaware 1945 TOTAL E&P USA INC Southwest Forrest Gas Gathering Co. ANADARKO E&P COMPANY, LP Southwest Gas Supply SUNDOWN ENERGY INC. Southwest Land Development Company FINAL OIL AND CHEMICAL COMPANY Southwest Petroleum Corporation SYLVAN RESOURCES, LLC Southwest Petrocorp, Inc SYLVAN RESOURCES, LLC Southwestern Energy Production Company SWN PRODUCTION COMPANY, LLC Southwestern Oil & Refining Co. 1974 KERR-MCGEE CORP. SOUTHWESTERN PRODUCTION CORP. Sovereign Exploration Co. BONANZA PETROLEUM, INC. Sparkman Energy Corp. 1985 ESKEY INC. Sparkman Producing Co. 1985 PLAINS EXPLORATION & PRODUCTION Spectrum 7 Energy Corp 1980-83 Drlg Prgs CABOT OIL & GAS CORP. SPG Exploration Corp. 1988 ANADARKO E&P COMPANY, LP Spinnaker Exploration Co., LLC HYDRO GULF OF MEXICO, LLC Spinnaker Royalty Co., LP Dorchester Minerals LP Spring Resources, Inc. XTO ENERGY INC. Spur Oil Co. 1960 MURPHY OIL CORP. SRC Production CONOCOPHILLIPS

67 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

SRC Realty Company CONOCOPHILLIPS St. Joe Petroleum PRIMARY FUELS, INC. St. Mary Land Exploration Co. SM ENERGY COMPANY St. Mary Operating Company ST. MARY LAND & EXPLORATION, INC. Stallion Energy, Inc. PLAINS EXPLORATION & PRODUCTION Stallion Panhandle 2001, LP PLAINS EXPLORATION & PRODUCTION Stallion Production Corp. PLAINS EXPLORATION & PRODUCTION Standard Gas Co./Standard Gasoline Co. CHEVRON U.S.A. INC. Standard Oil & Gas Co. of Oklahoma 1912 Shell Oil Co. Standard Oil Co. of California 1984 CHEVRON Standard Oil Co. of Indiana 1985 BP AMERICA Standard Oil Co. of Kansas 1948 BP AMERICA Standard Oil Co. of Kentucky 1961 CHEVRON Standard Oil Co. of Louisiana EXXON MOBIL CORP. Standard Oil Co. of Nebraska 1939 BP AMERICA Standard Oil Co. of New Jersey 1972 EXXON MOBIL CORP. Standard Oil Co. of New York 1931 EXXON MOBIL CORP. Standard Oil Co. of Ohio 1985 DALEN RESOURCES OIL & GAS CO. Standard Oil Co. of Texas 1961 CHEVRON Standard Oil Production Co. 1989 DALEN RESOURCES OIL & GAS CO. Stanolind Oil & Gas Co. 1981 BP AMERICA Star Oil & Gas Corp. 1980 TWO FOUR SIX EXPLORATION INC. STARK ENERGY INC. Starr Holdings Partnership KERRCO INC. Statoil Oil & Gas LP EQUINOR ENERGY PL Statoil Texas Onshore Properties LLC EQUINOR TEXAS ONSHORE PROPER- Statoil USA Onshore Properties Inc. EQUINOR USA ONSHORE PROPERTIES State Exploration STATEX PETROLEUM INC. States Exploration 1985 WEPCO ENERGY CO. STATEX PETROLEUM INC. Steaua Romana (U.S.) Inc. 1987 AMBRIT ENERGY CORP. Stephens Petroleum F.E. HARPER Sterling Oil Co. 1950 see Tenneco Inc Stetco Petroleum Co. DEVON ENERGY Stevens Oil & Gas ANADARKO PETROLEUM CORPORA- STJ LP mangaed by AVIVA Stoltz Wagner & Brown 1984 WAGNER & BROWN, LTD. Stone & Webster Oil Co, Inc. UNIT CORP. STONE ENERGY CORPORATION Stone Petroleum Co. 1983 FREEPORT-MCMORAN INC. Stove Creek Done Oil & Rfng. Co. 1955 BIG PINEY OIL & GAS CO.

68 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Strata Crop. 1986 RANGE RESOURCES CO. PETROLEUM Strata Energy, Inc. 1983 NATURAL RESOURCES MGMT CORP. STRIKER PETROLEUM CORP. Stroud Energy RANGE TEXAS PRODUCTION, LLC Subsurface, Inc. CHESAPEAKE KNAN ACQUISITION, LLC Suburban Propane Gas Corp. 1983 ANADARKO E&P COMPANY, LP Sumac Petroleum 1962 CHEVRON Summit Energy Inc. 1988 CASPEN OIL, INC. Sun Exploration & Production 1989 KERR-MCGEE OIL & GAS ONSHORE, Sun Refining and Marketing Co. SUNOCO PARTNERS MKGT & TERMI- Sunburst Exploration 1993 CHEVRON Sunburst Oil Co. 1922 MARATHON PETROLEUM CO. Sundance Energy Corp. TEXAS MERIDIAN RES. LTD. SUNDOWN ENERGY INC. Sunmark Exploration Co. KERR-MCGEE OIL & GAS ONSHORE, Sunningdale Oils. Ltd. KERR-MCGEE CORP. Sunny South Oil & Gas Inc. 1985 KELLEY OIL CORP. Sunnybrook Oil & Gas Inc. PLAINS RESOURCES, INC. SUNOCO PARTNERS MKT. & TERMINALS Sunray Oil Co. 1955 KERR-MCGEE OIL & GAS ONSHORE, Sunray-DX Oil Co. 1968 KERR-MCGEE OIL & GAS ONSHORE, Sunray-Mid Continent Oil Co. 1962 KERR-MCGEE OIL & GAS ONSHORE, Sunrise Oilfield Supply Company MERIDIAN PIPE & EQUIPMENT CO., INC. Sunrise Petroleum Inc. 1981 ORS CORP. Sunset International Petroleum CHEVRON Sunset Oil Co. HESS CORPORATION Superior Of Oklahoma 1943 SUNOCO PARTNERS MKTG & TERMI- Superior Oil Co. 1984 EXXON MOBIL CORP. Supply Development Group SUNDOWN ENERGY INC. Supron Energy Corp. 1982 CONOCOPHILLIPS Suran Royalty CHESAPEAKE ORC, LLC Surrey Oil & Gas Corp. 1960 MARATHON OIL COMPANY Swiss Oil Corp. 1936 ASHLAND OIL INC. Sun Operating LTD Partnership KERR-MCGEE OIL & GAS ONSHORE, Sydson D'Oro Expl. Co. Inc. TEXAS MERIDIAN RES. LTD. T & L Oil 1961 CHEVRON Tal Vez Oil Co. 1983 LINGEN OIL & GAS INC. Talisman Energy USA Inc REPSOL USA Tana Production Corp. 1989 TEXACO TPC, INC. Tanos Energy, LLC MEMORIAL PRODUCTION PARTNERS Targa Oil & Gas, Inc. 1983 CHAPMAN ENERGY INC.

69 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Target Oil & Gas, Inc. 1984 EGRET ENERGY CORP. Taurus Exploration Inc. ENERGEN RESOURCES CORP. Taurus Exploration USA ENERGEN RESOURCES CORP. TAURUS PETROLEUM INC. Taylor Oil & Gas Co 1955 see Tenneco Inc TCM, LLC PETROHAWK PROPERTIES, LP TDT Diverse L.P. FORTUNE NATURAL RESOURCES COR- TE Products Pipeline Company, LLC ENTERPRISE TE PRODUCTS PIPELINE TEAI Oil & Gas Co. PETROHAWK PROPERTIES, LP Teal Petroleum Co. SAMSON PROD SERVICES COMPANY Tectonic Energy Cor. 1984 ENERTEC CORP. Ted Weiner TEXAS CRUDE INC. Tee Oil, Inc. 1988* PRESIDIO OIL CO. Tee Operating Co. CHAPMAN RESOURCES TEJAS GAS CO. Tejas Production Co. 1980 WAINOCO OIL CORP. Tejax Energy 1987 HEADINGTON INVESTMENTS, INC. Tekoil Corp. 1962 CONSOLIDATED OIL & GAS, INC. Tema Oil Co. PIONEER NATURAL RESOURCES USA, Temex Energy, Inc. CALPINE NATURAL GAS, LP Templeton Energy, Inc 1987 TGX CORP. TENKAY RESOURCES INC. Tenneco Gas Prod. Co. RANGE ENERGY VENTURE CORP Tenneco LaTerre, Inc. 1988 TOTAL E&P USA INC Tenneco Ventures Corp. RANGE ENERGY VENTURE CORP Tenneco Ventures Finance Corp RANGE ENERGY FINANCE CORP Tenneco, Inc. / Tenneco Oil Company see TOC - Tennessee Glacier Park Co. CONOCOPHILLIPS TEPPCO Crude Oil LP ENTERPRISE CRUDE OIL LLC TEPPCO Colorado, LLC ENTERPRISE COLORADO LLC TEPPCO Crude GP, LLC ENTERPRISE CRUDE GP LLC TEPPCO Crude Oil, LLC ENTERPRISE CRUDE OIL LLC TEPPCO Crude Pileline, LLC ENTERPRISE CRUDE PIPELINE LLC TEPPCO Investments, LLC ENTERPRISE TE INVESTMENTS LLC TEPPCO Midstream Companies, LLC ENTERPRISE MIDSTREAM COMPANIES TEPPCO NGL Pipelines, LLC ENTERPRISE NGL PIPELINES II LLC TEPPCO Partners, L.P. ENTERPRISE TE PARTNERS L.P. TEPPCO Seaway, L.P. ENTERPRISE SEAWAY L.P. TEPPCO Terminialing and Marketing Compa- ENTERPRISE REFINED PRODUCTS TEPPCO Terminals Company L.P. ENTERPRISE REFINED PRODUCTS Terra Resources, Inc. 1981* OXOCO INC.

70 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

TERRAPET ENERGY CORP. TES Acquisition Corp. see Dominion Exploration & Production TESORO PETROLEUM CORP. TEX/CON OIL & GAS CO. TEXACO TPC INC. CHEVRON Texaco, Inc. CHEVRON TEXAS AMERICAN OIL CORP. Texas Commerce Bank JP MORGAN CHASE Texas Crude Inc WESTERLY EXPLORATION, INC. Texas Eagle Oil Co. 1984 RANGE PRODUCTION CO. MINERALS, Texas Eastern Exploration 1986* NOBLE ENERGY, INC. OIL CORP. Texas Eastern Products Pipeline Company, ENTERPRISE PRODUCTS PIPELINE Texas Energy Supply, Inc. DURANGO PRODUCTION CORP. Texas Fuel Co. 1902 CHEVRON Texas Gas Exploration Corp. 1986 ENERGEN RESOURCES CORP. Texas Gas Producing Co. HESS CORPORATION Texas Gulf Production 1963 BP AMERICA Texas International Oil Co., Ltd. GLOBAL NATURAL RESOURCES CORP. Texas International Petroleum Co. 1987 ENERGEN RESOURCES CORP. Texas Meridian Operating Co. Ltd. THE MERIDIAN RESOURCES CORPORA- Texas Meridian Prod. Co. Ltd THE MERIDIAN RESOURCES CORPORA- TEXAS MERIDIAN RESOURCES LTD. Texas National Petroleum Corp. 1962 CHEVRON CORP. Texas Northeast Oil & Gas Co. MOORE MCCORMACK ENERGY, INC. Texas Oil & Gas Corp. MARATHON OIL COMPANY Texas Pacific Oil & Gas ANADARKO PETROLEUM CORPORA- Texas Pacific Coal & Oil Co ANADARKO PETROLEUM CORPORA- Texas Pacific Oil Co. 1979 SUNOCO PARTNERS MKTG & TERMI- Texas Royalty Company (Assets) IMPERIAL OIL COMPANY Texas Southwest Resources Corp. KAISER-FRANCIS OIL CO. Texasgulf, Inc. 1981 ELF-AQUITAINE, INC. Texcan Resources Corp. 1982 CONOCOPHILLIPS Texco Energy Corp. EGRET ENERGY CORP. Texcon DALEN RESOURCES OIL & GAS CO. Texhoma Oil & Refining Co. 1928 CONOCOPHILLIPS Texoma Production Co. 1985 MCN EXPLORATION Texoma Production Co. 1986 APACHE CORP. TEXON ENERGY CORP. Texon Oil & Land Co. CONOCOPHILLIPS Texota Oil Co. 1968 NORTH AMERICAN RESOURCES CORP. Tex-Star Oil & Gas Corp. 1964 MARATHON OIL COMPANY

71 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

TGX Corp. CALPINE NATURAL GAS, LP The Bodrain Company (Merger) IMPERIAL OIL COMPANY Thomas C Mueller, Inc. Ltd & of Crawford XTO ENERGY INC. Three States Natural Gas Co. 1961 see Tenneco Inc Three Rivers Acquisition LLC COG OPERATING LLC Three Rivers Operating Company LLC COG OPERATING LLC Thru Line, Inc. THRU LINE O&G TX (WY)(LA)(MULTI- Tide Water Associated Oil Co. CHEVRON Tidewater Oil Co. 1967 CHEVRON TIPCO see TEXAS INTERNATIONAL PETROLE- TIPPERARY OIL & GAS CORPORATION Titan Resources I, Inc. CHEVRON MIDCONTINENT, LP Titan Resources CHEVRON CORP. Titan Resources, LP CHEVRON MIDCONTINENT, LP TOC - Gulf Coast Onshore TOTAL E&P USA INC TOC - California BP AMERICA TOC - Gulf of Mexico Federal Offshore CHEVRON TOC - Houston Oil & Minerals DEVON ENERGY TOC - Mid-Continent PIONEER NATURAL RESOURCES USA, TOC - Norway CONOCOPHILLIPS TOC - Rocky Mountains BP AMERICA TOC Acquisitions Corp. see Dominion Exploration & Production TOKLAN OIL & GAS CORPORATION Toklan Oil Cor. 1957 see Dominion Exploration & Production Toltec Oil & Gas Inc. 1983 CHAPMAN ENERGY INC. Tom Brown, Inc. ENCANA OIL & GAS USA, INC. Tom Brown, Inc. (NM Properties) MANGUM HUNTER Tonka Oil & Gas Ltd. 1974 PACIFIC ENTERPRISES OIL CO. (USA) TORCH ENERGY ASSOCIATES TORCH OIL & GAS CO. Tosco Corporation 1985 LION OIL TRADING & TRANSPORTA- Tosco-Lion, Inc. 1978 LION OIL TRADING & TRANSPORTA- TOTAL E&P USA INC Total Minatome Corp. ENERGEN RESOURCES Total Petro Inc 1987, Rocky Mtn Prop Only ENERGEN RESOURCES CORP. Total Petroleum (North America) Ltd. ULTRAMAR DIAMOND SHAMROCK TotalFina TOTAL E&P USA INC Towner Petroleum, 1986 ZILKHA ENERGY CO. Trafalgar House Oil & Gas, Inc., 1989 HARDY OIL & GAS USA INC. TRANS ATLANTIC RESOURCES CORP. TRANSAMERICAN NATURAL GAS CORP.

72 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Transco Expl Ptnrs Ltd (Offshore) 1988 * ENERGY DEVELOPMENT CORP. Transco Expl Ptnrs Ltd (Onshore) 1988 * see Dominion Exploration & Production Transco Exploration & Production WILLIAMS EXPLORATION CO. Transco Exploration Co. FOREST OIL CORPORATION TRANSCONTINENTAL OIL CO. Transcontinental Oil Co. 1930* MARATHON PETROLEUM CO. Transcontinental Production Co. FOREST OIL CORPORATION Transierra Exploration Corp. BELCOR, INC. Transmountain Production Co. 1974 TOTAL E&P USA INC TransOcean Oil Co. 1980 EXXON MOBIL CORP. Transwestern Oil Co. 1946 SUN CO, INC (R&M) Tranwestern Royalty Corp. 1949 DEVON ENERGY Transworld Oil USA, Inc. TRANSWORLD E&P, INC. Traver Oil Co. LAVINO OIL & GAS CO. Traverse Oil Co. 1985 FEDERATED NATURAL RES. CORP. Trebol Drilling Company CONOCOPHILLIPS Trebol Oil RODMAN-NOEL OIL CORP. Tredegar Oil & Gas Corp. WAINOCO OIL CORP. Tredegar Petroleum Corp. WAINOCO OIL CORP. Tredegar Properties, Inc. WAINOCO OIL CORP. Trend Drilling Co. NABORS DRILLING USA, LP Triangle USA Petroeum Corp. NINE POINT ENERGY LLC Tribal Oil Co. 1974 BUTTES OIL & GAS CO. Tribune Oil Cor. 1983 PACIFIC ENTERPRISES OIL CO. (USA) Trice Production Co. HESS CORPORATION Tricentrol Resources, Inc. 1984 BASF CORP/WINTERSHALL ENERGY Tricentrol U.S., Inc. 1988 BP AMERICA Trident NGL Inc. NATURAL GAS CLEARINGHOUSE Trigood Oil Co. ANADARKO E&P COMPANY, LP Trinidad Oil 1956 CHEVRON Trinity Oil & Gas Co. QUESTA OIL & GAS CO. TRINITY RESOURCES, INC. Tri-Power Petroleum Inc. 1986 PLAINS PETROLEUM CO. Triton Energy LTD HESS CORPORATION TRITON MINERALS & ROYALTY, INC. TRITON OIL & GAS CORP. Triton Producing Co. HESS CORPORATION Triumph Resources, LLC 2002 CHAPARRAL ENERGY, INC. True's Oil Co. 1959 BP AMERICA Trunkline 1967 ANADARKO PETROLEUM CORPORA- TRUST PIPE LINE CO.

73 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Turner Oil Co. 1915 Shell Oil Co. Twin Oil BP AMERICA TWO FOUR SIX EXPLORATION INC. TXL Oil Corp. 1962 CHEVRON TXO Production Co. 1991 MARATHON OIL COMPANY TXOK ENERGY RESOURCES CO. U.S. Exploration Co. 1989 THE MERIDIAN RESOURCES CORPORA- U.S. Exploration Holdings, Inc. NOBLE ENERGY, INC. U.S. MINERALS EXPLORATION CO. U.S. RESOURCES INC. U.S. Royalties Corp. IMPERIAL OIL COMPANY UGI Corp. 1985 see Dominion Exploration & Production ULTRAMAR DIAMOND SHAMROCK CORP. UMC Pet. Res. Cor. 1989 UMC PETROLEUM CORP. UMC PETROLEUM CORP. UNIMAR CORP. (UNION TEXAS/ Union Carbide Petroleum Corp. 1971 ASHLAND OIL, INC. Union Connection, Inc. ORBIT PETROLEUM, INC. Union Exploration Partners, Ltd. CHEVRON CORP. Union Gas & Oil Co. (Kentucky ) 1925 ASHLAND OIL, INC. Union Oil & Gas Corp. of Louisiana CONOCOPHILLIPS Union Oil Co. of California 1985 CHEVRON CORP. Union Pacific Resources Company ANADARKO E&P COMPANY, LP Union Petroleum Co. 1920 BP AMERICA Union Producing Co. DEVON ENERGY Union Sulphur WESTERN Union Texas Natural Gas 1962 BP AMERICA Union Texas Petroleum Corp. BP AMERICA Unit Carbon Co. ASHLAND OIL, INC. Unit Drilling & Exploration Co. 1985 UNIT CORP. United Central Oil Co. 1925 CROWN CENTRAL PETROLEUM CORP. United Oil Co. 1916 CONOCOPHILLIPS United Oil Co. 1926 BP AMERICA United Oil Cor. 1988 CREDO PETROLEUM CORP. United Producing Co. ASHLAND United Refining Co. 1976 DEVON ENERGY United States Exploration, Inc. NOBLE ENERGY, INC. Universal Consolidated Oil Co. 1961 CHEVRON Universal Energy Corp. 1986 ORS CORP. Universal Explorations Ltd 1989 CONQUEST EXPLORATION CO. Universal Resources Corp. QUESTAR EXPLORATION AND PRO-

74 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Universal Resources Corp. 1986 QUESTAR CORP. Unocal Corp. CHEVRON CORP. Unocal Exploration Corp. CHEVRON CORP. Upland Resources, Inc. GRANITE OPERATING CO. Usenco, Inc. 1988 PLAINS EXPLORATION & PRODUCTION USX Corp. (formerly U.S. Steel) 1983 MARATHON OIL COMPANY Utah Oil BP AMERICA V.M. Harrison OCCIDENTAL OIL & GAS CORPORATION Vacuum Oil Co. 1931 EXXON MOBIL CORP. VADIS INVESTMENTS, INC. Valero Producing Co. 1987 WACKER OIL INC. VALTEX PETROLUEM, INC. Valley Fina Oil Company 1979 TOTAL E&P USA INC VAN DYKE ENERGY CO. Van Dyke Oil Co. VAN DYKE ENERGY CO. VAN FOSSAN OIL ASSOCIATES Vanderbilt Energy 1985 DEVON ENERGY VANGUARD OIL & GAS INC. Vanguard Petroleum Corp. VANGUARD OIL & GAS INC. Vanguard Pipeline Corp. VANGUARD OIL & GAS INC. Vanguard Operating, LLC GRIZZLY OPERATING, LLC Vantage Point Energy 8/92 CONVEST ENERGY CORPORATION Vantage Point Operating Co. CONVEST ENERGY CORPORATION VARN OIL CO. Vastar Offshore, Inc. BP AMERICA Vastar Resources, Inc. BP AMERICA Veneucot Resources, Inc. DIVERSE ENERGY INVESTMENTS INC. VENEX CORP. Venezuela Syndicate, Inc. 1957 see Dominion Exploration & Production VENUS OIL CO. VICTORY ENERGY PARTNERS LLC Viking Oil Ltd. 1980 SUN CO., INC. (R&M) Vintage Petroleum, LLC OCCIDENTAL PETRO. CORP. Visa Energy Corp. ENSOURCE INC. VOLVO PETROLEUM, INC. Voyager HOWELL PETROLEUM CO. Voyager Petroleum TRANSCO EXPLORATION PARTNERS Voyager Petroleum FREEPART-MCMORAN W.A. Moncrief, Jr. MONCRIEF OIL INTERESTS W.K. Oil Co. 1915 Shell Oil Co. W.L. Hinds CONOCOPHILLIPS

75 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

W.B. Osborn LONGHORN OIL & GAS W.E. Bakke ABLE & BANCROFT W.E. Carl Oil Co. MCFARLAND ENERGY, INC. W.G. Skeeters Co. 1980 HARKEN OIL & GAS CORP. W.H. HEISLER, JR. W.R. Davis CONOCOPHILLIPS Wachovia Bank, Delaware WELLS FARGO BANK, SIOUX FALLS, Wachovia Bank, North Caroloina WELLS FARGO BANK, SIOUX FALLS, Wachovia Bank, NA WELLS FARGO BANK NA Wacker Oil Inc. DEVON ENERGY Wagner & Brown WAGNER & BROWN, LTD. Wagner & Brown II WAGNER & BROWN, LTD. WAGNER & BROWN LTD. Wainoco Oil Corp. FRONTIER OIL CORPORATION Walker Energy 1985 TEXAS MERIDIAN RESOURCES LTD Walker Energy Partners MLP 1989 TEXAS MERIDIAN RESOURCES LTD Waller County Minerals Co. GLOBAL NATURAL RESOURCES CORP. Walton Oil Co. 1982 OCTOBER OIL CO. Warren Petroleum CHEVRON Warren-Bradshaw CHEVRON Washington Royalties Company (Merger) IMPERIAL OIL COMPANY Washita Production Co. CHESAPEAKE ORC, LLC Waterford Energy Inc. 2/91 KAISER-FRANCIS OIL CO. Watson & Taylor Energy Inc 1987* KERR-MCGEE CORP. Watson Oil Corp. 1980 UMC PETROLEUM CORP. Waverly Oil Co., Inc. 1985 WAINOCO OIL CORP. WCOG Properties, Ltd. PETROHAWK PROPERTIES, LP WD Partners, LP WD O&G TX (WY)(LA)(MULTI-STATE) Weaver Oil & Gas Corp. ANADARKO E&P COMPANY, LP Webb Resources DALEN RESOURCES OIL & GAS CO. Weber Oil Co. 1942 MARATHON PETROLEUM CO. Weber Oil Co. 1957 EQUITY OIL CO. WECO Development Corp. HESS CORPORATION WEDCO OXFORD CONSOLIDATED, INC. Wellington Oil Co. CHEVRON WENTEX INTERNATIONAL, INC. WEPCO ENERGY CO. Westport Oil & Gas Co., Inc. KERR-MCGEE OIL & GAS ONSHORE, West Natural Gas 1962 BP AMERICA West Timbers Oil, LP XTO ENERGY INC. Westates Petroleum Co. 1976 DEVON ENERGY

76 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

Westcoast Oil & Gas 1976 PRESDIO OIL CO. WESTERN Western Associated Development Corp. BEACON EXPLORATION CO. Western Energy Dvlpmt. Co., Inc. 1986 OXFORD CONSOLIDATED, INC. WESTERN GEOPHYSICAL WESTERN NATURAL GAS CO. Western Oil & Fuel Co. 1958 CONOCOPHILLIPS Western Oil Fields Corp. 1928 CONOCOPHILLIPS Western Oil Fields Inc. CASPEN OIL, INC. Western Oil Shale Corp. 1980 MAGIC CIRCLE ENERGY CORP. Western Pacific Petroleum, Inc. GLOBAL NATURAL RESOURCES CORP. Western Resources Inc. WESTERN ENERGY Western States Producing Co. ANADARKO E&P COMPANY, LP Westheimer-Neustadt Corp. 1981 KFOC, INC. Westhoma Oil Co. 1976 CONOCOPHILLIPS Westland Drilling Co. GOLIAD OPERATING COMPANY Westland Exploration Co. 1992 KAISER-FRANCIS OIL CO. Westpan Resources LP PIONEER NATURAL RESOURCES USA, Westport Oil & Gas Co., LP KERR-MCGEE OIL & GAS ONSHORE, Westport Resources Corp. KERR-MCGEE Westrans Petroleum Inc. 1976 FREEPORT-MCMORAN ENERGY PTNRS WEXCO OF DELAWARE INC. WG Operating Co., Inc. HALCON OPERATING CO., INC. Whaley Co. 1962 CHEVRON White Eagle CIMAREX ENERGY CO. White Rock Equity LP LINN ENERGY HOLDINGS, LLC White Rock Equity Management LLC LINN ENERGY HOLDINGS, LLC White Rock Oil Co. GOLIAD OPERATING COMPANY WHITE TIGER LP managed by AVIVA White Wing Oil Co. GOLIAD OPERATING COMPANY Whitehall Oil Co. ASHLAND OIL INC. Whitewood Resources Inc. GREAT LAKES ENERGY PARTNERS LLC WHITING PETROLEUM CORP. Wichita Industries Inc. 1985 WICHITA RIVER OIL CO. Wichita River Oil Corporation BOULDER PETROLEUM, LLC Wicor Inc. 1985 WEXCO OF DELAWARE INC. Wilcox LONGHORN OIL & GAS CO. Wilcox Oil Corp. 1964 see Tenneco Inc Williams Arkoma Gathering Company, LLC WPX ENERGY ARKOMA GATHERING, Williams Exploration Co. WPX ENERGY Williams Exploration Co. 1986* TOTAL E&P USA INC I (50%)

77 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

WILLIAMS PRODUCTION RMT CO. WPX ENERGY ROCKY MOUNTAIN, LLC Wilshire Oil Co. B-L ASSOCIATES Wilshire Oil of California CHEVRON Winchester Energy Co. 1985 TERRAPET ENERGY CORP. Windsor Petroleum SOUTHWESTERN PRODUCTION CORP. Windsor Producing Co. 1981 SANTA FE MINERALS, INC. Winter Oil Co. BP AMERICA Wintershall Energy ELAND ENERGY, INC. Wintershall Oil & Gas Co. 1979* TOTAL E&P USA INC WINWELL RESOURCES, INC. Wiser Oil Co. FORREST OIL CORPORATION W-N Energy Corp. 11/92 KFOC, INC. Wolfson Oil CHEVRON Wolverine Exploration Co. UNIT CORP. Wolverine Gas and Oil Co., Inc. HIGHMOUNT EXPL & PROD MICHIGAN Wolverine Petroleum Corp. 1938 Shell Oil Co. Wolverine Reserves, LLC HIGHMOUNT EXPLORATION & PRODUC- Woodbine Production Corp. 1984 ILEX OIL CORP. Woodley Petroleum Co. 1959 CHEVRON CORP. Woodward Group, Inc. HIGHMOUNT EXPLORATION & PRODUC- Wood Oil Company PANHANDLE OIL AND GAS, INC. Wood River Oil & Refining Company KOCH EXPLORATION COMPANY, LLC Worland Associates 1998 CONTINENTAL RESOURCES Worldwide Energy Corp. 1985 HESS CORPORATION Worldwide One, Inc. HESS CORPORATION Worldwide Petroleum Corp. 1968 CONSOLIDATED OIL & GAS, INC. WPX Energy DEVON ENERGY Wymore Oil Co. EL PASO E&P COMPANY, LP Wynn-Crosby 1994 through 2000 (inclusive) PETROHAWK PROPERTIES, LP Xeno, Inc. ENCANA ENERGY XTO Energy Inc. Yamac Production Co. NEUMIN PRODUCTION CO. Yankee Cos. ACCESS ENERGY CORP Yankee Oil & Gas 1985 ACCESS ENERGY CORP Yates Exploration Co. 1981 OXOCO INC. Yellowstone Oil Co. DON FRANTZEN York & Harper 1954 see Tenneco Inc Yount-Lee Oil Co. 1935 BP AMERICA YPI Petroleum Inc. 1981 CASPEN OIL, INC. Zapata Petroleum DEVON ENERGY Zevex Corporation LL&B COMPANIES

78 Lower Case—Past Contact UPPER CASE—CURRENT CONTACT

ZG ENERGY CORP. ZIA Energy, Inc. PLANTATION PETROLEUM ACQUISI- ZIA Gathering, Inc. CONOCOPHILLIPS Zilkha Energy Company EL PASO E&P COMPANY, LP ZIM Energy Corp. 1987 MUSTANG RESOURCES CORP. Zinke & Trumbo, Inc. ZENERGY, INC

79