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The AAPG/Datapages Combined Publications Database
Utah Geological Association
Abstract
Lower Green River Formation in the Pleasant Valley Producing Area, Duchesne and Uintah Counties, Utah
Abstract
Several oil fields which produce from the lower Green River Formation (Eocene) in the vicinity of Pleasant Valley have expanded in recent years into a single large producing area. A 2,000 foot thick interval produces from multiple stratigraphic traps on regional structural dip along the southern margin of the Uinta Basin. One typical reservoir which has been mapped is a channel sand and is part of a fluvial delta system with a southerly source depositing lithic arkoses and feldspathic litharenites. Compaction, alteration, clay precipitation, and carbonate replacement and cementation have resulted in a low porosity and permeability reservoir. Completion procedures can be complicated by migration of fine particles and by acid sensitivity to an abundance of iron rich minerals. Primary production of 60,000 to 100,000 barrels only represents about 5% of the oil in place.
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