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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Analysis of the
Tuscaloosa-Woodbine Total Petroleum System and Implications for Assessing
Conventional Gas Resources in the Downdip Trend
Dubiel, Russell F.1 and
Pitman, Janet K.1
ABSTRACT
The overpressured Upper Cretaceous Tuscaloosa
and Woodbine Formations in the downdip trend of onshore Texas and Louisiana
have produced nearly 3 trillion cubic feet of gas from 20 fields. The U.S.
Geological Survey recently assessed undiscovered conventional gas fields
in the Tuscaloosa-Woodbine trend. Determining the number and sizes of undiscovered
fields in the downdip trend requires comprehensive geologic and petroleum-system
models that describe the principal source rocks, reservoir rocks, seals
and traps in the total petroleum system since much of the area is under-
or unexplored and has no data. Sequence- and seismic-stratigraphic analysis
documented a Cenomanian, shelf-margin and deep-water clastic system overlain
by Turonian marine shale in the downdip trend. The shelf-margin system is
composed of several higher-order sequences, each with lowstand and highstand
complexes. The higher order sequences are separated by sequence boundaries
and contain marine flooding surfaces. Moderately deformed salt underlies
the downdip trend, as it does the entire region, and the salt forms ridges
and diapirs that influenced sediment accumulation in the downdip system.
Rapid sediment deposition in mini-basins between salt ridges resulted in
syn-depositional growth faults and subtle structures. Interpretations of
reprocessed 2D seismic lines indicated that the majority of gas fields in
the downdip trend are associated with sandstone reservoirs in the mini-basins.
The bulk of the gas in the Tuscaloosa and Woodbine Formations is interpreted
to have formed in situ and is trapped in overpressured reservoirs
bounded by sealing growth faults and low-permeability shales. Knowledge of
the salt geometry, basin architecture, and controls on gas generation, migration,
and accumulation is crucial in identifying and assessing undiscovered fields
in the trend.
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