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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The Desert Springs gas field in central Sweetwater County, Wyoming, is gas and distillate productive from four zones in two Upper Cretaceous formations. The field exhibits stratigraphic traps on the regional dip of the west flank of the Red Desert-Great Divide basin.
The uppermost productive zone is a sandstone in the Lewis shale, and it appears to be a northward trending offshore bar.
The upper two-thirds of the Almond formation of the Mesaverde group have been zoned, in descending order, into five zones--of which the upper three are productive.
The trap in zone II is a result of a westward (updip) lateral facies change from sandstone into relatively impermeable, finer-grained clastics. The trap in zone III seems to be due to an updip wedge-out of the productive sandstone. Another wedge-out (southward) is indicated in zone IV which is, as yet, not productive. Both wedge-outs are thought to be beneath unconformities.
In summary, the Desert Springs gas field provides an excellent opportunity to study three of the main stratigraphic-type traps: offshore bar, lateral facies change, and wedge-out below an unconformity.
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