Cotton Valley Sandstone of East Texas: a log-core study
A comparison of calculations of various reservoir parameters, from logs and cores, provides guidelines for understanding reservoir evaluation in the Cotton Valley Sandstone of east Texas. The cores and logs are from the Carthage field area in Panola County. In these rocks, grain size distribution and the degree of shaliness, in addition to porosity, control permeability and irreducible water saturation. Clays in the Cotton Valley are mainly illite and chlorite. Cementation factor and saturation exponent values vary on a bed-by-bed basis; however, values of a = 1, m = 1.83, and an average value of n = 1.89 are acceptable for general evaluations. Sun's BITRI program was used to compute values for lithology porosity and water saturation, in good agreement with standard core and x-ray analysis. Cotton Valley Sandstone intervals with porosities less than 4% appear to be nonproductive.
- Research Organization:
- Sun Exploration and Production Co., Richardson, TX
- OSTI ID:
- 6426946
- Report Number(s):
- CONF-8410143-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 68:9; Conference: 34. annual meeting of the Gulf Coast Association of Geological Societies and Gulf Coast Section of SEPM, Shreveport, LA, USA, 24 Oct 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
RESERVOIR ROCK
DRILL CORES
WELL LOGGING
TEXAS
COMPARATIVE EVALUATIONS
GEOLOGIC FORMATIONS
GRAIN SIZE
PERMEABILITY
POROSITY
SANDSTONES
WATER SATURATION
CRYSTAL STRUCTURE
FEDERAL REGION VI
MICROSTRUCTURE
NORTH AMERICA
ROCKS
SATURATION
SEDIMENTARY ROCKS
SIZE
USA
020200* - Petroleum- Reserves
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030200 - Natural Gas- Reserves
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