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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
1Petroleum Consultant, 151 18th Avenue East, Seattle, Washington 98112; e-mail: [email protected]
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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