--> ABSTRACT: Facies-Related Permeability Trends in the Frontier Formation along the Moxa Arch, Green River Basin, Wyoming, by H. Scott Hamlin, Robert L. Buehring; #91002 (1990).
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ABSTRACT: Facies-Related Previous HitPermeabilityNext Hit Trends in the Frontier Formation along the Moxa Arch, Green River Basin, Wyoming

H. Scott Hamlin, Robert L. Buehring

In the western part of the Green River basin, the Frontier Formation comprises marine and nonmarine Previous HitsandstoneNext Hit and shale facies, which record early Late Cretaceous foreland-basin sedimentation. Diporiented fluvial channel-fill Previous HitsandstoneNext Hit and strike-aligned marine shoreface Previous HitsandstoneNext Hit are enclosed in coastal-plain and nearshore-marine shale and sandy shale. The Frontier Previous HitsandstoneNext Hit facies form a major low-Previous HitpermeabilityNext Hit gas play in the Green River basin. Frontier reservoirs typically lie in laterally extensive but shale-rich Previous HitsandstoneNext Hit "benches" that contain variable amounts of clean Previous HitsandstoneNext Hit in which porosity and Previous HitpermeabilityNext Hit are best developed.

Studies of core show that the clay plus silt (mud) component of Frontier reservoirs is an important control on porosity and Previous HitpermeabilityNext Hit and that detrital mud content is related to depositional environment. Unlaminated mixtures of sand and mud typify bioturbated shoreface facies, whereas in channel-fill facies mud occurs as rip-up clasts, drapes, and interlayers. Shaly Previous HitsandstoneNext Hit facies generally have permeabilities less than 0.5 md (commonly less than 0.1 md). Clean Previous HitsandstoneNext Hit, having permeabilities between 0.1 and 10.0 md, is most commonly found in units having well-developed cross-stratification or planar lamination.

Gross Previous HitsandstoneNext Hit thickness can be obtained Previous HitfromNext Hit the gamma-ray log alone, but net clean Previous HitsandstoneNext Hit in the Frontier is most reliably interpreted using SP, gamma-ray, and resistivity logs in conjunction. More sparsely distributed core and porosity-log data are used to calibrate log responses. For this study logs Previous HitfromNext Hit more than 700 wells and cores Previous HitfromNext Hit 15 wells form the database for regional and field-scale Previous HitsandstoneNext Hit mapping. Netclean-Previous HitsandstoneNext Hit maps reveal facies-related trends, which can be extended into sparsely drilled areas, and therefore are useful in guiding strategies for development in low-Previous HitpermeabilityTop gas-bearing Frontier sandstones.

AAPG Search and Discovery Article #91002©1990 AAPG Rocky Mountain Section Meeting, Denver, Colorado, September 16-19, 1990