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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT:
Distribution of Diagenetic Overprints and Reservoir Quality in Woodbine Sandstones,
Double A Wells Field, Polk County, Texas
Barrett, Mary L.,1 Bresch, Chris,1 and
Kitchingham, Trevor2
ABSTRACT
Four conventional cores were studied from the Woodbine
interval of Double A Wells Field, Polk County, Texas. The objective was
to characterize
the distribution of diagenetic overprints and petrophysical properties
in relation to lithologic units. The cores are from the Champion International
C no. 1, 57 ft; the Alabama-Coushatta no. 6, 58 ft; the W. T. Carter
Battise GU no. 1, 119 ft; and the W. T. Carter no. 7, 118 ft. Cores were
described,
and lithologic units, lithofacies, and diagenetic overprints were characterized.
Fifty thin-sections were also studied so as to verify and interpret the
diagenetic
overprints recognized initially by using a binocular scope. Measured
core data and well log curves were compared to lithologic and diagenetic
data
to delineate reservoir-quality patterns.
The diagenetic overprints are calcite, quartz,
quartz and carbonate, and matrix. The secondary cements and recrystallized
depositional matrix vary at the finer scale of lithologic units, not
lithofacies. The best reservoir properties, 16-22% porosity and permeability
greater
than 10-100 millidarcies, occur in clean sandstones of medium bed thickness
or
greater and have a quartz or quartz and carbonate overprint. There are
also thin-bedded to laminated clean sandstones that alternate with argillaceous
sandstones or shales. These clean sandstones have similar diagenetic
overprints as medium-bedded clean sandstones but are extensively cemented.
Other sandstones
contain a depositional matrix, and this fabric limits the amount of later
diagenetic products. These argillaceous sandstones may have porosity
up to
12-16 % but permeability values are often less than one millidarcy.
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