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The AAPG/Datapages Combined Publications Database
Williston Basin Symposium
Abstract
MTGS-AAPG
Seventh International Williston Basin Symposium, July 23,
Cretaceous System Stratigraphy and Shallow Gas Resources on the Fort Peck Reservation, Northeastern Montana
ABSTRACT
Four upper Cretaceous formations have been identified as shallow gas exploration targets on the Fort Peck Reservation in northeastern
Montana. Gas shows are documented and sandy intervals correlated with Canadian equivalents. Progradational, regressive, depositional
environments vary from inner shelf, sand ridge complexes to outer shelf, shaly, sheet sands. The Judith River, Eagle, Niobrara
and Greenhorn Formations present suitable horizons for further investigation. Stratigraphic thinning in upper Cretaceous rocks
generally occurs where these sands are better developed over the prominent structural
feature known as the Wolf Creek nose.
Conventional drilling for deeper oil zones has not properly tested the shallow gas zones. Shows, net pay
maps
, and reservoir
quality determinations will guide exploration and development along
structural
trends.
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