Print this page2003 U.S. Geological Survey Assessment of Undiscovered Oil and Gas Resources in Upper Cretaceous Navarro and Taylor Groups, Western Gulf Province, Texas
T. S. Dyman1, S. M. Condon2, R. R. Charpentier2, T. A. Cook2,
T. R. Klett2, M. D. Lewan2, M. J. Pawlewicz3, R. M. Pollastro2, and
C. J. Schenk2
1 U.S. Geological Survey, Denver, CO
2 U.S. Geological Survey, N/A
3 U.S. Geological Survey
The U.S. Geological Survey (USGS) recently completed an assessment of the undiscovered oil and gas potential of the Upper Cretaceous Navarro and Taylor Groups in the Western Gulf Province of the Gulf Coast Region as part of a national oil and gas assessment effort. The assessment was based on the general geologic elements used to define a total petroleum system (TPS): hydrocarbon source rocks (source rock maturation, hydrocarbon generation and migration), reservoir rocks (sequence stratigraphy and petrophysical properties), and hydrocarbon traps (trap formation and timing). Using this geologic framework, the USGS defined a single TPS, the Smackover-Austin-Eagle Ford Composite TPS and five assessment units (AU) in the Navarro and Taylor Groups: Travis Volcanic Mounds Oil AU, Uvalde Volcanic Mounds Gas and Oil AU, Navarro-Taylor Updip Oil and Gas AU, Navarro-Taylor Downdip Gas and Oil AU, and Navarro-Taylor Slope-Basin Gas AU.
The USGS assessed undiscovered conventional oil and gas for each of the AUs resulting, at the mean value, in estimated volumes of 1,682.8 billion cubic feet of nonassociated gas and associated gas in oil fields, 33.22 million barrels of oil, and 34.26 million barrels of natural gas liquids. All of the undiscovered gas is conventional. The Navarro-Taylor Slope-Basin Gas AU contains an estimated mean of 924.96 billion cubic feet of gas, representing about 55 percent of the total mean undiscovered gas resource (1,682.8 billion cubic feet) for the Navarro-Taylor Groups.
AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005