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Stratigraphy and exploration of the lower Cretaceous Muddy formation northern Powder River Basin, Wyoming and Montana

Journal Article · · Mt. Geol.; (United States)
OSTI ID:5007643
The Muddy Formation in the N. Powder River Basin of Wyoming and Montana is divided into 2 units: lower and upper. The lower Muddy sandstones are preserved as infill of a dendritic channel system which was incised into the Skull Creek Shale during an earlier period of emergence. The sand was supplied from the delta to the northeast and transported to the south by longshore currents. The lower Muddy sandstones were deposited principally in a transitional marine and estuarine environment. Oil and gas production from the Muddy Formation is principally from stratigraphic traps. However, structure plays an important role in the localization of many Muddy fields. Lower Muddy production is restricted to updip channel boundaries and is localized by structural noses and updip channel re-entrants. Upper Muddy production is controlled chiefly by porosity development and lateral facies changes. (15 refs.)
Research Organization:
Davis Oil Co.
OSTI ID:
5007643
Journal Information:
Mt. Geol.; (United States), Journal Name: Mt. Geol.; (United States) Vol. 9:4; ISSN MOGEA
Country of Publication:
United States
Language:
English

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