Diagenesis and burial history of the lower Cretaceous Travis Peak Formation, East Texas
Sandstone in the Travis Peak (Hosston) Formation has been extensively modified by burial diagenesis. Permeability has been reduced to less than 0.1 md as a result of compaction, extensive precipitation of authigenic minerals, and minor pressure solution. Thin zones of higher porosity and permeability occur mainly near the top of the formation; porosity and permeability decrease with depth below the top. The first authigenic cement to precipitate was illite. Next, extensive quartz cement occluded much of the primary porosity. Oxygen-isotopic composition of quartz overgrowths indicates that they precipitated from meteoric fluids at temperatures of 130 to 165 F. These temperatures equate to depths of 3000 to 5000 ft. Dissolution of orthoclase and albitization of plagioclase followed quartz cementation and occurred prior to mid-Cretaceous movement of the Sabine Uplift. An abrupt loss of orthoclase occurs at 1200 ft below the top of the Travis Peak, and albitization is more extensive deeper in the formation. Illite, chlorite, and ankerite precipitated after feldspar diagenesis; these late authigenic phases incorporate ferrous iron released by thermal reduction of iron compounds. Ankerite was derived primarily from early dolomite cement, but it incorporated some light carbon from maturation of organic matter and radiogenic strontium from feldspar dissolution. Oil migrated into Travis Peak reservoirs about 65 mya from shale in the Bossier Formation. Later deasphalting of the oil filled much of the remaining porosity in some zones near the top of the formation with reservoir bitumen.
- Research Organization:
- Texas Univ., Austin (USA)
- OSTI ID:
- 6443411
- Country of Publication:
- United States
- Language:
- English
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