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The AAPG/Datapages Combined Publications Database
Wyoming Geological Association
Abstract
North Fork and Cellers Ranch Fields: "Differential Sedimentation" or Thrust-Folding?
Abstract
Seismic and dipmeter data show that the oil in the North Fork and Cellers Ranch fields on the western flank of the Powder River basin is trapped in thrustfaulted structural closures at the level of the productive Minnelusa Formation sandstone reservoir. The causal thrust, which emanates from Precambrian basement, extends upward into a regional decollement surface within the upper Goose Egg salt zone and is attenuated there. Attempts to explain these data in terms of "late Permian tectonism and resultant differential sedimentation" (Moore, 1984) repudiate structural constraints.
Log studies show that thinning of the Goose Egg section along the North Fork axis is the result of Goose Egg deposition over a paleotopographic high on the underlying Minnelusa Formation that is more or less coincident with the superimposed, thrust-fold, Laramide structure.
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