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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The lower San Andres Formation in Cochran and Hockley Counties, Texas, is one of the most prolific hydrocarbon-bearing horizons of the Permian basin. It is a cyclic sequence of shallow-water carbonates and evaporites which prograded across the Northwest shelf toward the Midland and Delaware basins. San Andres production results from the vertical stacking of porous dolomite reservoirs. Stratigraphic trapping of hydrocarbons results from porosity pinch-outs defined by the degree of dolomitization and anhydrite plugging, both vertically near the top of depositional cycles, and on a regional scale. Stratigraphic trapping, combined with subtle structural nosing and changes in dip, define the limits of production. Reservoir zones are regionally correlatable and mappable. Major roductive trends pinch out northward onto the Matador arch, defining this feature as a major influence on San Andres deposition and production.
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