Omaha Pool and Mica-Periodotite Intrusives, Gallatin County, Illinois
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lb 14.GS: RPI 130 c. 2 STATE OF ILLINOIS DWIGHT H. GREEN, Governor DEPARTMENT OF REGISTRATION AND EDUCATION FRANK G. THOMPSON, Director DIVISION OF THE STATE GEOLOGICAL SURVEY M. M. LEIGHTON, Chief URBANA REPORT OF INVESTIGATIONS—NO. 130 OMAHA POOL AND MICA-PERIDOTITE INTRUSIVES, GALLATIN COUNTY, ILLINOIS BY R. M. ENGLISH and R. M. GROGAN Reprinted from STRUCTURE OF TYPICAL AMERICAN OIL FIELDS, VOLUME III Amer. Assoc. Petrol. Geol. (April, 1948), pp, 189-212 PRINTED BY AUTHORITY OF THE STATE OF ILLINOIS URBANA, ILLINOIS 1948 ORGANIZATION STATE OF ILLINOIS HON. DWIGHT H. GREEN, Governor DEPARTMENT OF REGISTRATION AND EDUCATION HON. FRANK G. THOMPSON. Director BOARD OF NATURAL RESOURCES AND CONSERVATION HON. FRANK G. THOMPSON, Chairman W. H. NEWHOUSE, Ph.D., Geology ROGER ADAMS, Ph.D., D.Sc, Chettiistry LOUIS R. HOWSON, C.E., Engineering A. E. EMERSON, Ph.D., Biology LEWIS H. TIFFANY, Ph.D., Forestry GEORGE D. STODDARD, Ph.D., Litt.D.. LL.D., L.H.D. » President of the University of Illinois GEOLOGICAL SURVEY DIVISION M. M. LEIGHTON, Ph.D., Chief (53430-2M) SCIENTIFIC AND TECHNICAL STAFF OF THE STATE GEOLOGICAL SURVEY DIVISION 100 Natural Resources DuUding, Urbana M. M. LEIGHTON, Ph.D., Chief Enid Townley, M.S., Assistant to the Chief Helen E. McMorris, Secretary to the Chief Velda a. Millard, Junior Asst. to the Chief Elizabktii Stephens, B.S., Geological Assistant GEOLOGICAL RESOURCES GEOCHEMISTRY Arthur Bevan, Ph.D., D.Sc, Principal Geologist in Frank H. Reed, P H.D., Chief Chemist Charge Gkace C. Johnson, B.S., Research Assistant Coal Coal G. H. Cady, Ph.JJ., Senior Geologist and Head G. R. YoHE, Ph.D., Chemist and Head R. J. Helfinstine, M.S., Mech. Engineer Ruth C. Wildman, M.S., Research Assistant Robert M. Kosanke, M.A., Assoc. Geologist Wm. F. Loranger, B.A., Research Assistant John A. Harrison. B.S., Asst. Geologist Jack A. Simon, M.S., Asst. Geologist (on leave) Raymond Siever, M.S., Asst. Geotogist Industrial Minerals Mary E. Barnes, li.S.. Asst. Geologist Margaret Parker, B.S., Asst. Geologist J. S. Machin, Ph.D., Chemist and Head "Tin Boo Yee, M.S., Assistant Chemist Paulene Ekman, B.A., Assistant Oil and Gas Research A. H. Bell, Ph.D., Geologist and Head Fluorspar Frederick Squires, B.S., Petroleum Engineer l^AviD H. Swann, Ph.D., Assoc. Geologist G. C. Finger, Ph.D., Chemist and Head Virginia Kline, Ph.D., Assoc. Geologist Horst G. Schneider, B.S., Special Research Asst. Paul G. Luckhardt, M.S., Asst. Geologist Robert E. Oesterling, B.A., Special Research As- Wayne F. Meents, Asst. Geologist sistant Richard J. Cassin, B.S., Reseai^ch Assistant Richard Blough, B.A., Research Assistant Nancy McDurmitt, B.S., Research Assistant William Frederick Buth, B.S., Special Research Assistant Industrial Minerals Chemical Engineering J. E. Lamar, B.S., Geologist and Head Robert M. Grogan, Ph.D., Assoc. Geologist H. W. Jackman, M.S.E., Chemical Engineer and Raymond S. Shrode, B.S., Research Assistant Head P. W. Henline, M.S., Assoc. Chemical Engineer Clay Resources and Clay Mineral Technology B. J. Greenwood, B.S., Mechanical Engineer James C. McCullougk, Research Associate Ralph E. Grim, Ph.D., Petrographer and Head William A. White, M.S., Asst. Geologist X-ray and Spectrography Groundwater Geology and Geophysical W. F. Bradley, Ph.D., Chemist and Head Exploration Analytical Chemistry Carl A. Bays, Ph.D., Geologist and Engineer, and Head O. W. Rees, Ph.D., Chemist and Head Robert R. Storm, A.B., Assoc. Geologist L. D. McVicker, B.S., Chemist Merlyn B. Buhle, M.S., Assoc. Geologist Howard S. Clark, A.B., Assoc. Chemist M. PuLLEN, M.S., Asst. Geologist W. Jr., Emile D. Pierron, M.S., Research Assistant Prescott, Asst. Geologist Gordon W. B.S., Elizabeth Bartz, A.B., Research Assistant Robert N. Urash, Asst. Geologist M. B.S., Gloria Gilkey, B.S., Research Assistant Margaret Castle, Asst. Geologic Draftsman J. J. Donald Russell Hill, B.S., Research Assistant Ruth E. Koski.B.S., Research Assistant Engineering Geology and Topographic Mapping Annabelle G. Elliott, B.S., Technical Assistant George E. Ekblaw, Ph.D., Geologist and Head Richard F. Fisher, M.S., Asst. Geologist MINERAL ECONOMICS Areal Geology and Paleontology W. H. VosKuiL, Ph.D., Mineral Economist W. L. BuscH, Research Associate Assista^tt H. B. WiLLMAN, Ph.D., Geologist and Head Nina Hamrick, A.M., Research Heinz A. Lowenstam, Ph.D., Assoc. Geologist Ethel M. King, Research Assistant Templeton, Assoc. Geologist J. S. Ph.D., EDUCATIONAL EXTENSION Subsurface Geology (Gilbert O. Raasch, Ph.D.. Assoc. Geologist L. E. Workman, M.S.. Geologist and Head Dorothy Ranney, B.S., Technical Assistant Elwood Atherton, Ph.D., Assoc. Geologist Paul Herbert, Jr., B.S., Asst. Geologist LIBRARY Marvin P. Meyer, M.S., Asst. Geologist Donald Saxby, iSI.S., Asst. Geologist Anne E. Kovanda, 15. S., B.L.S., Librarian Robert C, McDonald, B.S., Research Assistant Ruby D. Frison, Technical Assistant Physics PUBLICATIONS R, J, PiERSoL, Ph.D., Physicist Emeritus poROTHv E. KogE, B.S., Technical Editor Mineral Resource Records M. Elizabeth Staaks, B.S., Assistant liditor MKSEpiTii M. Calkins, Geologic Draftsman VniAN (jfiRDON, Head Ardis 1), PvE, Asst. Geologic Draftsman Ruth R. Wardrn, B.S.j Research Assistant Wayne W. Nofftz, Technical Assistant Dorothy F. Spencer, B.S., Technical Assistant Leslie D. Vaughan, Associate Photographer Hakriet C. Daniels, B.A,, Technical Assistant Beulah M. Uni-'er, Technical Assistant Konzo, Consultants: Ceramics. Ralph K. Huksh, B.S., University of Hlinois; Mechanical Engineering, Seichi M.S., University of Hlinois. Topographic Mapping in Cooperation with the United States Geological Survey. This report is a contribution of the Industrial Minerals Division. February 15, 1948 Digitized by the Internet Archive in 2012 with funding from University of Illinois Urbana-Champaign http://archive.org/details/omahapoolmica130engl OMAHA POOL AND MICA-PERTDOTITE INTRUSIVES, GALLATIN COUNTY, ILLINOIS^ M. ENGLISH^ AND R. M. GROGAN^ Mattoon and Urbana, Illinois ABSTRACT The Omaha pool was discovered in November, 1940, by the Carter Oil Company's York No. I, SE. i, SE. i, SW. I of Sec. 33, T. 7 S., R. 8 E., Gallatin County, Illinois. The producing area is now defined and extends o\ er 450 acres located generally southwest of the discovery well. Production is from the Paksline and Tar Springs formations of the Chester (Upper Mississippian) series. The pool is on the crest of a large dome and is exceptional in that igneous rock is found in intrusive contact with the prodrcing sands. Sills and dikes ranging from less than one foot to 50 feet in thickness, composed of mica-peridotite, occur at many levels in the Pennsylvanian and Chester series. Contact effects indicate that some oil was in the sands before intrusion of the igneous mate- rial, suggesting a certain amount of prior uplift. The pronounced doming of the structure and the intrusion of dikes and sills may have accompanied intrusion of a hypothetical subjacent laccolithic or stock like igneous body, probably in post-Pennsylvanian-pre-Cretaceous time. Minor folding occurred earUer at the close of the Mississippian period. INTRODUCTION The Omaha pool is located in northwestern Gallatin County which is in south- eastern Illinois (Fig. i). This field is one of the few localities in the state where igneous rock has been encountered while drilling for oil, and it is the only field where the producing sands are found in contact with igneous rock. The first well drilled on the Omaha structure was the Kingwood's Robin- in son No. I, NE. i, NW. i, NW. i of Sec. 4, T. 8 S., R. 8 E., and was located what is now the northwest corner of the field. This well, completed as a dry hole in February, 1940, found poorly developed Palestine and Tar Springs sands. 1 Manuscript received , May 9, 1946. The parts of this paper deahng with the stratigraphy and structure of the field, and with the general discussion of the producing area and of production statistics are the work of the senior writer. The junior writer studied the available cores of igneous rock and prepared tlie section deahng with their description. The writers collaborated in the discussion of time of accumulation and the reasons for the small size of productive area. The maps showing oil wells represent development to October i , 1945. The writers gratefully acknowledge the advice and criticism given by M. D. Mclvin and Allen Ehlers of the Carter Oil Company; by M. M. Leighton, A. H. Bell, L. E. Workman, O. VV. Rees, P. W. Henhne, J. E. Lamar, and R. E. Grim of the Illinois Geological Survey; and by Professor F. F. Grout of the University of Minnesota. 2 Division geologist, Carter Oil Company. 2 the chief. Associate geologist, Illinois State Geological Sur\ ey . Published by permission of 189 IQO R. M. ENGLISH AND R. M. GROGAN The discovery well of the pool, the Carter Oil Company's York No. i, SE. .J, SE. J, SW. I of Sec. 33, T. 7 S., R. 8 E., is located in the north part of the field. This well was completed in November, 1940, and produced at the rate of 186 barrels of oil and 40 barrels of water per day from the Palestine sand. Since that time 20 wells have been completed in the Omaha pool— 14 in the Palestine INDEX TO NUMBERED POOLS 1 CENTERVILLE EAST 5 HERALD 2 NEW HARMONY CONSOL. 6 NEW HAVEN 3 MAUNIE 7 INMAN WEST 4 ROLAND e INMAN EAST Fig. I. —Index map showing location of Omaha pool and of near-by pools producmg from Chester formations. sand, 3 in the Tar Springs sand, and 3 as dual completions in both sands.