Diagenesis of the San Andres Formation: Unit 4 Carbonate, G. Friemel and Detten Wells

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1987

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Petrographic examination of 71 thin sections from the San Andres unit 4 carbonate reveals a complex diagenetic history. Diagenetic events include precipitation of calcite cement, neomorphic replacement of micrite by sparry calcite, development of moldic porosity, dolomitization, precipitation of halite and anhydrite, minor precipitation of celestite, and replacement of halite by calcite, dolomite, and anhydrite. Porous intervals are recognized within the San Andres unit 4 carbonate, corresponding to partly or completely dolomitized intervals. These diagenetic phases reflect an active history of changes in water composition, suggesting potential for further studies of rock-water relationships.

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