Reservoir analysis, Pennsylvanian Tensleep formation, Little Buffalo Basin, Wyoming

Conference · Mon Feb 01 04:00:00 EST 1971 · Am. Assoc. Pet. Geol. Bull.; (United States)

OSTI ID:5785089

McCaleb, J A; Emmett, W R; Beaver, K W

The Little Buffalo Basin field, in NW. Wyoming on the SW. side of the Big Horn Basin, is a N.-S. asymmetric anticline 3-1/2 miles long, 1-1/2 mile wide, with about 1,000 ft of structural closure. Oil was discovered in 1943 in the Pennsylvanian Tensleep. Cumulative production has been over 30 million bbl of oil from the 1,500 acres. Reservoir energy is from an active water drive from the north-northwest. A core study of the Tensleep revealed that extensive cross-bedding, permeability variation and fraction orientation influence oil recovery from the reservoir. The Tensleep Sandstone and Dolomite gradationally overlie the Amsden Formation carbonates and shales, and average 275 ft in thickness. There is a general increase in average grain size of the Tensleep Sandstone progressing upward in the section and also an increasing amount of cross-bedding and poor sorting. Deposition occurred in relatively high-energy transporting currents in a shallow water, nearshore, and/or deltaic marine environment. Nonmarine channeling and sanddunes also occur in the upper part of the section.

• Research Organization: Pan American Petr Corp
• OSTI ID: 5785089
• Report Number(s): CONF-710364-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol. Bull.; (United States) Journal Volume: 55:2
• Country of Publication: United States
• Language: English

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02 PETROLEUM
020200* -- Petroleum-- Reserves
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CARBONATES
DOLOMITE
ENERGY SOURCES
FOSSIL FUELS
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GEOLOGIC AGES
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