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Reservoir Characterization Using Logs, Core, and Borehole Images, Mesaverde Sandstone: North LaBarge Field, Sublette County, Wyoming
North LaBarge field, which produces oil from Cretaceous Mesaverde Sandstone reservoirs, is located on the northern extension of the Moxa arch in southwestern Wyoming. Principal Mesaverde reservoirs consist of stacked lower shoreface parasequences, which stratigraphically belong to the Lazeart member of the Adaville Formation. Borehole images and cores were used to subdivide sandstones into "high energy" and "mixed-energy" sandstone facies. Facies maps of high-energy sandstones indicate that production patterns are, in part, facies controlled. Vertical porosity/permeability variations are related to sedimentary structures and calcite cementation.
Facies and erosion patterns indicate that east-west trending faults identified with 3-D seismic are reactivated structures. Early movement along such faults exerted a primary control on sandstone deposition, such that thick high-energy sandstones were deposited on ancestral "highs," and mixed-energy deposits accumulated in low areas. The only compartmentalizing fault within North LaBarge field has a history of reactivation.
At North LaBarge field, coaly Mesaverde Group deposits overlie lower shoreface sandstones. The discontinuity represented by this unconformable sequence of rocks may represent a regional lowstand surface of erosion and sequence boundary.
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