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Pitchfork oil field, Park County, Wyoming

A. V. Robertson Coe
Pitchfork oil field, Park County, Wyoming
The American Association of Petroleum Geologists Bulletin (1967) 51 (10): 2115-2121


Pitchfork field is on a surface anticline located on the western flank of the Big Horn basin approximately 45 mi southwest of Cody, Wyoming. The Tensleep Sandstone is the main producing formation, and the Phosphoria Formation contributes 15 to 20 bbl of oil per day from three dually completed wells. Development of Pitchfork field has proceeded in three stages. Refined or new techniques of geologic evaluation were used in re-evaluation of data gathered from each previous stage. Development in the first stage, from the discovery in 1930 to 1955, was based on surface data. It was slow because of poor economics. Development in the second stage, from 1955 to 1962, was based on a search for higher structural positions. In the final stage, from 1962 to the present, wells have been drilled on the flanks of the anticline in search of unflushed "pods" of oil. In a low-gravity, high-viscosity reservoir, it is difficult to define the oil-water contact. Because of the relatively thick oil-water transition zone and because of the abrupt stratigraphic and porosity changes within the reservoir, it was found that high water-cut wells were offset both along strike and downdip by economic procedures, some of which found almost no water.

ISSN: 0002-7464
Serial Title: The American Association of Petroleum Geologists Bulletin
Serial Volume: 51
Serial Issue: 10
Title: Pitchfork oil field, Park County, Wyoming
Pages: 2115-2121
Published: 1967
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
Accession Number: 1967-022691
Categories: Economic geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N41°00'00" - N45°00'00", W111°04'60" - W104°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1967
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