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The upper San Andres Formation at West Seminole field can be divided into three depositional sequences of transgressive, regressive, and transgressive cycles culminating in thick tidal-flat deposits. Diagenesis altered sabkha environments via dolomitization, anhydration, and de-anhydration. Heterogeneous porosity and permeability result in porous and permeable layers separated by nonporous and impermeable layers or porous and impermeable layers. The reservoir characteristics are the combined results of depositional facies and diagenesis.
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