--> Abstract: Geology and Case History of Buck Draw Field, Campbell County, Wyoming, by R. T. Sellars, Jr. and C. M. Hawkins; #91017 (1992).

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ABSTRACT: Geology and Case History of Buck Draw Field, Campbell County, Wyoming

SELLARS, R. T., JR., Independent, Denver, CO, and C. M. HAWKINS, Louisiana Land and Exploration Company, Denver, CO

Buck Draw field, a Lower Cretaceous Fall River (Dakota) pool, was discovered in Campbell County, Wyoming in 1983. Since 1986, the field has been unitized and pressure maintained (miscible flood) to enhance ultimate fluid recoveries. The field currently has 15 producing wells and 8 injection wells, and has produced approximately 14.4 million bbl of oil. Ultimate recovery is estimated to be more than 22 million bbl. The discovery focused industry attention on the central part of the Powder River basin as an area to explore for significant Fall River reserves.

Production at Buck Draw is from the Fall River channel facies.

Hydrocarbons are trapped where the sinuous channel facies' convex side is located updip against impermeable nonchannel facies. Impervious shales form the top and bottom seals. This pattern is consistent with other Fall River pools elsewhere in the basin where westward tilting of the eastern flank of the basin has taken place.

A transgressive erosional surface separates the overlying Fall River from the underlying Fuson-Lakota sequence in the Black Hills on the eastern side of the basin. This surface can be traced into the subsurface of the Powder River basin where Fuson nomenclature is erroneously used to describe the overlying black shales. These shales should be considered as part of the lower Fall River facies deposited during an initial advance of the Lower Cretaceous seaway. Palynological data suggest these shales, as well as the lower part of the Skull Creek Shale, were deposited in fresh to brackish water.

 

AAPG Search and Discovery Article #91017©1992 AAPG Rocky Mountain Section Meeting, Casper, Wyoming, September 13-16, 1992 (2009)