Petrography and Diagenesis of the Travis Peak (Hosston) Formation, East Texas

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Date

1985

Authors

Dutton, Shirley P.

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Abstract

Petrographic studies of the Travis Peak Formation in East Texas were used to interpret the diagenetic history of Travis Peak sandstones and to relate the diagenetic history to permeability variations within the formation.

Travis Peak sandstones are fine to very fine-grained quartzarenites and subarkoses that were derived from sedimentary, metamorphic, and igneous rocks exposed in a large area of the southwestern United States. The originally high depositional porosity in matrix-free sandstones was reduced by compaction and precipitation of authigenic cements, particularly quartz, ankerite, illite, and chlorite. In addition, reservoir bitumen, a high molecular weight hydrocarbon residue, occludes porosity in some zones near the top of the Travis Peak. Porosity and permeability have a wide range of values at the top of the formation, but both the range of values and the maximum values decrease with depth below the top of the Travis Peak. Dissolution of orthoclase and plagioclase has formed most of the secondary porosity. Porosimeter-measured porosity is the best predictor of permeability, and there is a significant inverse correlation between the total volume of cement and permeability.

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