...A. V. Robertson ABSTRACT 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...

...A. V. Robertson Coe ABSTRACT The Pitchfork oil field, discovered in 1930, is on a steeply dipping, surface-anticlinal structure along the west flank of the Big Horn basin, Park County, Wyoming. The discovery well was completed at a total depth of 3,903 ft. in the Tensleep Sandstone. Field...

...Fig. 6. —Structure-contour map of Pitchfork anticline. ...

...Richard L. Hay ABSTRACT The Pitchfork formation is here defined as the lowest series of beds in the southeastern part of the Absaroka Range, Wyoming. The Pitchfork formation consists largely of detrital rocks—sandstones, siltstones, and conglomerates—containing volcanic débris from eruptive centers...

... the Paleozoic section. The important hydrocarbon reservoir rocks include limestone, dolostone, chert, sandstone, siltstone, and conglomerate. Many significant oil and gas accumulations occur in carbonate rocks. Trapping mechanisms include anticlines, structures related to faults, various stratigraphic traps...

... drilled wells (for locations, see Fig. 1 ), including (1) 49 cutting samples from the American Quasar Sellers Draw-1 well (U.S. Geological Survey [USGS] library number: CA00006; lat 44.11°N, long 108.62°W), (2) two solid core samples from the Husky Oil 87 Pitchfork well (USGS library number: C477; lat...

...), Garland (2,600± feet), and Salt Creek (1,600 feet). Ten of the fields in this classification are rather elongated, narrow, and unsymmetrical anticlines, such as Pitchfork, 63 and Alkali Butte; and one field—Labarge—may be a complexly faulted structure resembling an anticline. Eleven of the 21...

... of 550 to 1,040 feet, and the beds below are essentially undeformed. Characteristic features of the South Fork thrust mass, which suggest a detachment thrust (decollement), are: (1) tightly folded anticlines and synclines and overturned, recumbent, and faulted folds; (2) the base of the thrust mass...

... classification, as illustrated by the Manderson-Nowood trend in the southeastern part of the basin. These oils are in a series of contiguous traps along a steeply plunging anticline, becoming shallower from Manderson to Nowood. The cross section ( Fig. 4 ) is along the crest of the anticline ( A-A ′, Fig. 3...

...-water contacts observed in the normal multi-zoned Paleozoic anticlinal fields to height of the oil column, formational thicknesses in the crestal area, and number of Paleozoic formations productive of hydrocarbons in each field. The similar chemical composition of the Paleozoic crude oils...

... also deposited in crevices and underground channels. Samples from the Husky Oil Company’s Unit 5 well in the Pitchfork field on the west side of the Big Horn Basin exhibit fragments of limestone cut by basal Amsden sandstone stringers, 200 feet below the top of the Mississippian. The relief...

...., Wyoming 14 Frannie Park Co., Wyoming 28 Hamilton Dome Hot Springs Co., Wyoming 15 Lamb Big Horn Co., Wyoming 24 Lost Soldier Sweetwater Co., Wyoming 34 Oregon Basin Park Co., Wyoming 20 Pitchfork Park Co., Wyoming 15 Red Springs Hot Springs Co., Wyoming 10 Spence...