Diagenesis of Cotton Valley sandstone (Upper Jurassic), East Texas: Implications for tight gas formation pay recognition
The Upper Jurassic Cotton Valley sandstone comprises a thick siliciclastic sequence in the East Texas basin. These sediments were deposited in a dominantly progradational sequence of shallow marine and fluvial-deltaic environments. Along the eastern flank of the basin, natural gas is produced from low porosity and low-permeability reservoirs which have been stimulated by massive hydraulic fracturing. Cotton Valley sandstones generally are very finegrained, well-sorted quartz arenites and subarkoses. Principal framework constituents are monocrystalline quartz and feldspars. The sandstones have a complex diagenetic history and are cemented by authigenic quartz, calcite, phyllosilicates, and iron oxides. The most common paragenetic sequence of pore-fill minerals is development of clay coats on grains; formation of syntaxial overgrowths; dissolution of unstable grains followed by precipitation of phyllosilicates; precipitation of calcite in relict primary and secondary pores; and replacement of grains by calcite resulting in a poikilotopic texture. Cotton Valley sandstones are classified by R-mode factor.
- Research Organization:
- Amoco Production Co., Houston, TX
- OSTI ID:
- 6891458
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 67:6
- Country of Publication:
- United States
- Language:
- English
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RESERVOIR ROCK
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FEDERAL REGION VI
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GEOLOGIC AGES
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NORTH AMERICA
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USA
030200* - Natural Gas- Reserves
Geology
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