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AAPG Bulletin

Abstract

AAPG Bulletin, V. 83 (1999), No. (August 1999), P. 1207-1222.

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Powder River Basin, Wyoming: An Expanding Coalbed Methane (CBM) Play 

Scott L. Montgomery1

©Copyright 1999.  The American Association of Petroleum Geologists.  All Rights Reserved

1Petroleum Consultant, 151 18th Avenue East, Seattle, Washington 98112; e-mail: [email protected]

Information used in the preparation of this article was kindly supplied by the following individuals and companies: Tom Doll, Barrett Resources; Don Freeman, Lance Oil & Gas Company, Inc.; Nancy Doelger, Bureau of Land Management (Casper, Wyoming), U.S. Department of the Interior; Paul Rady, Pennaco; Tim Lohmann, Petrie Parkman & Company; Peter Dea, Barrett Resources. I extend my sincere appreciation to these individuals and companies for making this paper possible. 

ABSTRACT

Coalbed methane exploration in the Powder River basin represents an active play with considerable potential for future expansion and success. Such potential is related to the specific geology and character of the target coals, which exist in the Paleocene Fort Union Formation at depths of 300-2000 ft (91-610 m). Although of low rank (lignite-subbituminous), these coals are volumetrically very large, consisting of thick (50-150 ft;15-45 m), laterally extensive seams with significant amounts of late-stage biogenic methane. Wells drilled to exploit this resource in updip areas have benefited from dewatering associated with existing coal mining, as well as from existing pipeline infrastructure. In downdip areas, Fort Union coal beds are artesian aquifers and require significant drawdown for gas production. Innovative drilling and completion practices have been instrumental in lowering costs and increasing production, thus contributing to the overall success of the existing play. Production data suggest ultimate recoverable reserves of 0.3-0.4 bcf per well, making the play economical even at relatively low gas prices. 

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