Time-stratigraphic analysis and petroleum accumulations, Patrick Draw field, Sweetwater County, Wyoming

The principal productive interval consists of two porous and permeable, north-trending, barrier-bar sandstone bodies at the top of the Almond Formation (Upper Cretaceous). They grade updip on the west into impermeable shale and sandstone that were deposited in a swamp and lagoonal environment. A second important productive interval is sandstone about 40 feet below the top of the Almond that was probably deposited as a tidal delta in a lagoon. An early trap was formed when the reservoir sandstone beds were warped over an east-plunging structural nose. When the present Wamsutter Arch was formed in post-early Eocene time, the old trap was opened and the petroleum spilled northward to be trapped at its present location.

This record provided courtesy of AGI/GeoRef.

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