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AAPG Bulletin

Abstract

DOI: 10.1306/02072218153

Geologic models underpinning the 2018 US Geological Survey assessment of hydrocarbon resources in the Eagle Ford Group and associated Cenomanian–Turonian strata, United States Gulf Coast, Texas

Katherine J. Whidden,1 Janet K. Pitman,2 Heidi M. Leathers-Miller,3 Ofori N. Pearson,4 Nicholas J. Gianoutsos,5 Scott A. Kinney,6 Justin E. Birdwell,7 Stanley T. Paxton,8 Lauri A. Burke,9 and Russell F. Dubiel10

1Central Energy Resources Science Center, US Geological Survey (USGS), Denver, Colorado; [email protected]
2Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]
3Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]
4Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]
5Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]
6Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]
7Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]
8Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]
9Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]
10Central Energy Resources Science Center, USGS, Denver, Colorado; [email protected]

Abstract

The availability of new geologic and production data has greatly increased since 2010, when the US Geological Survey (USGS) last assessed undiscovered, technically recoverable oil and gas resources in the Cenomanian–Turonian (CT) Eagle Ford Group (EFG) across Texas. This new information facilitated an updated assessment of undiscovered continuous oil and gas resources in the Eagle Ford and associated CT strata.

 Literature and USGS research data were used to build the geologic models for the assessment units (AUs). The USGS defined six continuous AUs within the EFG: (1) Eagle Ford Marl Continuous Oil, (2) Eagle Ford Marl Continuous Gas, (3) Submarine Plateau-Karnes Trough Continuous Oil, (4) Submarine Plateau-Karnes Trough Continuous Gas, (5) CT Mudstone Continuous Oil, and (6) CT Mudstone Continuous Gas. An additional AU, the CT Slope Continuous Gas AU, was defined but not quantitatively assessed. The boundaries of these AUs were defined by thickness, lithofacies, thermal maturity, regional geology, and the spatial distribution of productive fairways.

 The resulting total mean estimates for undiscovered, technically recoverable resources for these six AUs are 8.5 billion bbl of oil and 66 trillion ft3 of gas. These results for both oil and gas resources are within the top five volumes of previously assessed continuous accumulations in the United States and attest to the importance of the EFG and associated CT strata as a significant source of petroleum well into the future.

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