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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract:
Sequence
Stratigraphy of the Downdip Woodbine
Sandstone, Upper Gulf Coast, East Texas
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By
Oryx Energy
Dallas, Texas
Cretaceous Woodbine deltas in the East Texas basin have
fifty years of production history. Recently, the uncertain
relationship of reservoir sands within the Woodbine and those
in the overlying Eagleford strata has been clarified using
sequence
analysis
. The resulting Woodbine and Eagleford
stratigraphic sequences in the East Texas basin contain transgressive
and highstand deposits; associated lowstand components
comprise the downdip extensions of these intervals in
the upper Gulf Coast where thicknesses triple to nearly 3000 ft.
Downdip producing fields include Damascus, Hortense,
Leggett, Seven Oaks, Double A Wells, and Sugar Creek. Core
examination of downdip reservoir facies corroborated earlier
interpretations of turbidite sandstones in Sugar Creek field.
Twenty miles to the west, along present-day structure, reservoirs
within Double A Wells field exhibit massive to laminated
sands of distributary mouth bar (delta front) origin, frequently
slumped, and associated with bioturbated marine shelf shales.
The mouth bars abruptly overlie outer marine shelf to upper
slope shales, and are interpreted as the result of deposition
within a shelf-edge delta setting.
The juxtaposition of the turbidite and shelf-edge reservoir
sandstones, supported by biostratigraphic data, well
log
correlations,
and available seismic provides evidence for two lowstand
sequences. Regional mapping of the downdip Woodbine/Eagleford succession has identified that Hortense, Leggett, Seven
Oaks and Double A Wells fields as belonging to the younger
Eagleford
sequence
, while Damascus and Sugar Creek fields
occur in the Woodbine interval.
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