Cotton Valley Sandstone of East Texas: a log-core study

Conference · Sat Sep 01 04:00:00 EDT 1984 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6426946

Wilson, D A; Hensel, Jr, W M

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-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 68:9
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
COMPARATIVE EVALUATIONS
CRYSTAL STRUCTURE
DRILL CORES
FEDERAL REGION VI
GEOLOGIC FORMATIONS
GRAIN SIZE
MICROSTRUCTURE
NORTH AMERICA
PERMEABILITY
POROSITY
RESERVOIR ROCK
ROCKS
SANDSTONES
SATURATION
SEDIMENTARY ROCKS
SIZE
TEXAS
USA
WATER SATURATION
WELL LOGGING