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Georges Bank Petroleum Exploration OCS Report MMS 2000-031 GEORGES BANK PETROLEUM EXPLORATION Atlantic Outer Continental Shelf By Gary M. Edson Donald L. Olson Andrew J. Petty U.S. Department of the Interior Minerals Management Service Gulf of Mexico OCS Region New Orleans Office of Resource Evaluation May 2000 GEORGES BANK PETROLEUM EXPLORATION ATLANTIC OUTER CONTINENTAL SHELF Ten wells were drilled on Georges Bank, offshore from New England, from 1976 through 1982 (table 1, figure 1). The first two wells were Continental Offshore Stratigraphic Test (COST) wells, drilled during 1976 and 1977 by energy company consortiums to gain geologic information prior to offshore Federal petroleum exploration leasing. After leases were awarded, eight industry exploration wells were drilled in 1981 and 1982. None of these encountered significant concentrations of oil or natural gas, and drilling has not resumed since 1982. Records and data from the wells are maintained by the Minerals Management Service (MMS), Department of the Interior, at the Gulf of Mexico OCS Region office, 1201 Elmwood Park Boulevard, New Orleans, Louisiana 70123-2394, (504) 736-0557. Summaries and analyses of data from the industry exploration wells are contained in eight Geological and Operational Summary publications accompanying this report. Table 1. Georges Bank wells Protraction Block Well Well Type Operator Spud Measured Diagram No. or Date Depth (ft) COST No. NK 19-9 975 1 Exploration Exxon 11-25-81 14,605 NK 19-11 79 - COST G-1 Ocean Production 04-06-76 16,071 NK 19-12 133 1 Exploration Exxon 07-24-81 14,118 NK 19-12 141 - COST G-2 Ocean Production 01-06-77 21,874 NK19-12 145 1 Exploration Conoco 05-13-82 14,500 NK19-12 187 1 Exploration Tenneco 03-12-82 18,127 NK 19-12 273 1 Exploration Mobil 06-30-82 15,580 NK 19-12 312 1 Exploration Mobil 12-08-81 20,000 NK 19-12 357 1 Exploration Shell 04-14-82 19,427 NK 19-12 410 1 Exploration Shell 08-10-81 15,568 Names of protraction diagrams are: NK 19-9, Corsair Canyon; NK 19-11, Hydrographer Canyon; NK 19-12, Lydonia Canyon. COST is Continental Offshore Stratigraphic Test. bonus bids totaling $816,516,546. LEASING HISTORY Subsequent sales (Numbers 52, 82, and 96) were canceled. Beginning in 1982, the Federal offshore Lease Sale 42, held on United States Congress enacted a series of December 18, 1979, was the only one-year leasing moratoria on portions of successful North Atlantic Planning Area the Outer Continental Shelf, and these (Georges Bank) lease offering. Sixty-three grew in area to include Federal waters blocks were leased to companies for 1 68 67 Chatham Corsair Canyon NK 19 - 8 NK 19 - 9 EXXON BLK. 975 NO. 1 41 41 COST NO. G-1 EXXON COST CONOCO BLK. 133 NO. 1 NO. G-2 BLK. 145 NO. 1 MOBIL BLK. 312 NO. 1 TENNECO BLK. 187 NO. 1 SHELL SHELL BLK. 357 NO. 1 BLK. 410 NO. 1 40 30' 00" MOBIL 40 30' 00" 0 M BLK. 273 NO. 1 10 Hydrographer Canyon Lydonia Canyon NK 19 - 11 NK 19 - 12 M 0 0 2 68 67 EXPLANATION MA. RI. Leased Tracts Sale 42 (1979) Atlantic Ocean Dry Hole 0 10 20 STATUTE MILES AREA OF INTEREST Figure 1. Map of the North Atlantic offshore area showing well locations. Bathymetry in meters. 2 along the entire United States Atlantic The COST G-1 well was drilled 89 statute coast. On June 12, 1998, President miles east-southeast of Nantucket Island in Clinton issued an executive order that Block 79 of OCS protraction diagram prevents the leasing of any area currently NK 19-11 (Hydrographer Canyon). under moratorium until June 30, 2012. Drilling took place from April through All of the 1979 Georges Bank leases have July of 1976 to a measured depth of now been relinquished or have expired. 16,071 feet. (All depths cited in this report are measured depths, i.e., relative to Since 1988, a leasing moratorium has also kelly bushing.) From January through been in effect on the Canadian portion of August of the following year, the COST Georges Bank, which is underlain by the G-2 well was drilled 43 miles farther east- East Georges Bank Basin, to the northeast southeast in Block 141 of NK 19-12 of the Yarmouth Arch (figure 2). Texaco, (Lydonia Canyon) to a measured depth of BP-Amoco, and Chevron hold three large 21,874 feet. Water depths were 157 and exploration concessions there. Exclusive 272 feet, respectively. Both wells were exploration rights belonging to these intentionally drilled off-structure, that is, companies remain intact but are suspended at locations where petroleum for the duration of the moratorium. This accumulations are unlikely, according to moratorium was reviewed in 1996 through analysis of seismic data. 1999, and the review committee recommended that the suspension of The COST wells were intended to provide exploration be extended to 2012, matching stratigraphic and other geologic and the adjoining U. S. moratorium. The Nova engineering data useful to companies and Scotian and Canadian governments the Government in preparing for the North accepted this recommendation. Atlantic lease sale. In addition, evaluation of subsequently drilled industry EXPLORATION HISTORY wells would be aided by comparison with COST well analytic results, and all the Seismic service companies acquired more wells could be correlated by means of than 100,000 line miles of seismic data by seismic data and wireline logs. permit in the North Atlantic Planning area since 1966 (figure 3). Between 1966 and The up-dip G-1 well (figure 4) penetrated 1990 there were two accelerated periods of Cenozoic and Mesozoic siliciclastic seismic data acquisition. More than sedimentary rocks to a depth in excess of 40,000 line miles were shot from 1974 9,000 feet (Upper Jurassic); interbedded through 1977 as companies evaluated the Middle and Lower (?) Jurassic basin before Lease Sale 42. In 1981 and siliciclastics and limestone from about 1982, more than 33,000 line miles were 9,000 to about 12,000 feet; and below that shot in the years that the exploration wells to total depth, Lower Jurassic (?) and were drilled. Triassic (?) interbedded siliciclastics, dolomite, anhydrite, and minor limestone. 3 68o 66o 64o 62o 60o 58o 56o Newfoundland Miquelon o UNITED L and 46 CANADA a STATES u St. Pierre r (FRANCE) 2 e o 0 n 46 0 2 m t 0 ia 0 New Brunswick n m Maine C h dy a un n F Nova Scotia n y of f e Ba hel l o Halifax S 44 an rm ti fo Sco t o la n 44 P i s Sable Gulf ve a Ha B Island La n of ia Maine ot Sc ch Ar 0 m o 20 42 h t Explanation Georges Banku o o m 200 m Isobath 42 r a East Georges Y Landward edge Georges Bank Basin of Mesozoic basins Bank Basin Canada - Nova Scotia 0 50 100 Miles petroleum leases o 40 68o 66o 64o 62o 60o 58o 56o Figure 2. Map of Georges Bank and the Scotian Shelf, showing sedimentary basin locations, areas of Canadian petroleum leases, and 200-meter (shelf-edge) isobath. 4 DEPTH COST COST FEET METERS NO. G-1 NO. G-2 0 0 42 STATUE MILES 67 KILOMETERS 1000 500 2000 3000 Siliciclastics 1000 4000 5000 1500 6000 2000 7000 Siliciclastics and 8000 2500 Limestone 9000 10000 3000 11000 3500 Limestone 12000 and Siliciclastics 13000 4000 Siliciclastics, Dolomite, Anhydrite and 14000 Minor Limestone 4500 15000 Dolomite, Anhydrite, 16000 Limestone, and Minor 5000 Siliciclastics 17000 TD 16,071 ft. 18000 5500 Paleozoic Dolomite and 19000 Phyllite 6000 20000 21000 6500 ? Halite 22000 TD 21,874 ft. Figure 4. Lithologic columns of the Georges Bank COST G-1 and G-2 wells. Adapted from Amato and Simonis (1980). 6 The well bottomed in metamorphic subbasin, where the sedimentary section is basement at a measured depth of 16,071 thickest. Water depths ranged from 209 to feet. 453 feet, and measured well depths from 14,118 to 20,000 feet. The companies’ The down-dip G-2 well encountered a exploration targets, stated in their higher proportion of carbonate rocks. Exploration Plans, were mostly identified Limestone began at about 2,400 feet as Middle or Upper Jurassic (one Lower (Upper Cretaceous) and was interbedded Jurassic) oolite banks, reefal buildups, and with siliciclastics to about 10,000 feet. carbonate drape structures over basement Below that, in Middle Jurassic (?) to highs or salt swells. Some predrilling Upper Triassic (?) strata, the proportion of interpretations predicted enhanced siliciclastics was subordinate, and porosity, caused by dolomitization. The limestone dominated to about 13,500 feet, seismic features, from which these targets with dolomite and anhydrite, subordinate were inferred, were all high-amplitude limestone, and minor siliciclastics below reflectors with apparent structural closure. that to total depth. This well bottomed in Located between two and three seconds, Upper Triassic or Lower Jurassic halite two-way travel times, the crests of these and anhydrite at a depth of 21,874 feet. features were expected to be between 9,000 and 16,000 feet. These depths are Federal regulations direct the Department within the Jurassic carbonate section of the of the Interior to release COST well COST G-2 well and the interbedded geologic data to the public 60 days after a Jurassic carbonate and siliciclastic section lease is granted within 50 nautical miles of of the G-1 well. well sites. Leases from OCS Sale 42 were granted in February of 1980, and the Hydrocarbons were not discovered on Conservation Division of the U.S.
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