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Read before the Association at Atlantic City, New Jersey, April 25, 1960. Manuscript received, January 1, 1960.
Department of Geology, University of Colorado, Boulder, Colorado.
Committee consists of the following members and area representatives.
Chairman: Bruce F. Curtis
Statistical work: Ruth B. Curtis, Consultant, Boulder, Colo.
California, Central: C. A. Bengtson, Standard Oil Co. of California, Oildale, Calif.
Louisiana, South: Jules Braunstein, Shell Oil Co., New Orleans, La.
San Juan Basin: Harrcll Budd, Consultant, Farming-ton, N. Mex.
Kansas: Virgil B. Cole, Consultant, Wichita, Kans.
Texas, East; Louisiana, North; Arkansas: Bruce \V. Fox, The Atlantic Refining Co., Tyler, Tex.
Oklahoma: Harry Glover, Texaco, Inc., Tulsa, Okla.
Colorado, North; Nebraska; Utah: Penn L. Gooldy, The British-American Oil Prod. Co., Denver, Colo.
Appalachian Basin: T. P. McCann, Shell Oil Co., Pittsburgh, Pa.
Illinois Basin: D. P. Meagher, Humble Oil and Refining Co., Carter Division, Mattoon, III.
Permian Basin: K. F. Meyer, Humble Oil and Refining Co., Roswell, N. Mex.
Texas, North: North Texas Geological Society, Wichita Falls, Tex.
Texas, Southeast: J. H. Pound, Houston Geological Society, Houston, Tex.
California, South and North: Keith L. Rathbun, Continental Oil Co., Los Angeles, Calif.
Mississippi, Alabama: Ted R. Russell, The Atlantic Refining Co., Jackson, Miss.
Wyoming, South: F. D. Spindle, The Ohio Oil Co., Casper, Wyo.
Texas, Panhandle: S. Keith Tuthill, Panhandle Geological Society, Amarillo, Tex.
Texas, Soutliwest: R. D. White, Southern Minerals Corp., Corpus Christi, Tex.
Wyoming, North: John H. Wiese, Richfield Oil Corp., Casper, Wyo.
Montana: D. L. Zicglar, The California Co., Billings, Mont.
The committee gratefully acknowledges the work of many other geologists and organizations who assisted the area representatives. The following contributed particularly large parts of the study—California, Central: J. W. Bedford, J. S. Bigelow, R. D. Hoffman, T. A. Roy, T. S. Wyman. Louisiana, South: Eugene Miller. Texas, Southeast: R. T. Carville. Kansas: Roy P. Lehman, L. B. Fugitt. Ark-La-Tex Area: Gerald W. Thomas, William Champion, Gerald C. Merket. Oklahoma: J. B. Petta. Colorado-Nebraska-Utah: Arthur W. Johnson, David C. Gagliardo. Appalachian Basin: New York Museum Science Service (John C. Broughton, State Geologist) Arthur Van Tyne, William L. Kreidler; Pennsylvania Geological Survey (Carlyle Gray, State Geologist) Addison Cate, William S. Lytle; West Virginia Geological Survey (Paul H. Price, Director) Oscar L. Haught; Ohio Geological Survey (Ralph L. Bern-hagen, Chief) Theodore A. DeBrosse; Ashland Oil and Refining Co., Frank Fisher and staff. Illinois Basin: J. C. Tolle, Dale C. Finley, Jr., S. H. Stith, A. S. Brau-millcr, James H. Griffith. Permian Basin: K. K. Kinney, R. F. Montgomery, John Runyon, N. A. Sax, B. A. Belknap, M. L. Feldman, Monty Gist, Eugene Green-wood, Raymond Nicholas. California, South and North: F. E. Minshall, R. B. Kelly. Wyoming, South: W. L. Skipp, Robert Steed. Texas, Southwest: Gene Dressier. Wyoming, North: Leonard M. Taucher.


A statistical study of 7,241 reservoir sandstones in various oil-producting regions of the United States was completed by a committee of petroleum geologists. The study shows that 68 per cent of the sandstones are of Tertiary age, although each geologic age from Cambrian to Pleistocene, inclusive, is represented. Most of the sandstones are restricted in physical dimensions; they commonly cover less than 100 square miles of areal extent, and have an average thickness of about 39 feet.

The factors which control petroleum accumulation in the sandstones more commonly result from the structural configuration (56 per cent of reservoirs) than from stratigraphie conditions (10 per cent) or from combinations of structural and stratigraphie features (34 per cent), and it is found that the thicker sandstones tend to be broader and better reservoirs than their relative thickness, alone, would suggest. A closer analysis of the sandstones involved in stratigraphie type accumulations shows that 61 per cent of them were deposited under shoreline or nearshore conditions. It is found that 54 per cent of all the reservoir sandstones studied contain mainly oil, 27 per cent contain gas, and the remainder carry substantial amounts of both oil and gas.

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