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AAPG Bulletin

Abstract


Volume: 41 (1957)

Issue: 5. (May)

First Page: 923

Last Page: 936

Title: Red Wash-Walker Hollow Field, Stratigraphic Trap, Eastern Uinta Basin, Utah

Author(s): M. Dane Picard (2)

Abstract:

Red Wash-Walker Hollow, Utah's largest stratigraphic oil field, produces from the lowermost member (Douglas Creek) and the overlying Garden Gulch member of the Green River formation of Eocene age. One sub-commercial gas well has been completed in the lower part of the Uinta (Eocene) formation, and a single oil well produces from the lower part of the Douglas Creek member and the upper part of the underlying Wasatch (Eocene) formation. To November 1, 1956, there were 50 oil and 6 gas wells in the field.

The percentage of sandstone and siltstone in the productive interval increases from 20 per cent on the southeastern edge of the field to 70 per cent on the northwestern edge, and isopercentage lines strike N. 45° E. The source was on the northwest, north, and northeast (ancestral Uinta mountains) from pre-existing sediments. The productive interval consists primarily of lacustrine sandstones and siltstones, which are mature orthoquartzites for the most part.

The entrapment can be characterized as a complex, lenticular sandstone network blanketing a part of a relatively large northwest to westerly plunging anticlinal nose. Single sand lenses or closely related sandstone lens groups represent closed reservoir systems in themselves. For this reason fluid separations commonly appear anomalous, but are a reflection of relative structural position within a particular sandstone lens group. Most sand lenses, or connected sandstone lens networks, disappear southeast; however, there are some exceptions.

Isopach studies indicate that there may have been slight deformation at the beginning of "Uinta time," forming one or more very minor closures in the area; but it is not believed that this tectonic activity was significant to the stratigraphic entrapment of oil and gas.

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