1st Research Conference - Gulf Coast Section SEPM
1st Research Conference - Gulf Coast Section SEPM
1st Research Conference - Gulf Coast Section SEPM
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Depositional Environment of Woodbine Sandstones,<br />
Polk County, Texas<br />
Foss, D.E., Chevron USA, Denver, CO (p. 17-19)<br />
Woodbine sandstones produce mostly natural gas in stratigraphic traps at<br />
Seven Oaks, Hortense, Leggett, and R.B. fields in Polk County, Texas. The<br />
Woodbine section can be divided into lower, middle, and non-bioturbated and<br />
bioturbated upper units of interbedded sandstones and shales. Strike-trending<br />
pod-shaped concentrations of bioturbated upper Woodbine sandstones are the<br />
principal reservoirs in these fields.<br />
Lower and middle Woodbine sandstones are thinly to thickly bedded and<br />
isolated in black non-bioturbated shales. Thinner sandstones average 0.25 ft<br />
and typically consist of more complete turbidite sequences (i.e., ABCE, ABCDE,<br />
BCDE, and CDE). Thicker sandstones that range from 0.5 ft to as much as 2.5<br />
ft contain less complete sequences (i.e., A, AB, B, and BC). Thicker sandstones