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The U.S. Geological Survey (USGS) assessed undiscovered, technically recoverable oil and gas resources in the conventional sandstone reservoirs of downdip Paleogene formations deposited along an arcuate extent from south Texas through Louisiana (Salvador, 1991). The USGS conducts geology-based assessments of undiscovered petroleum resources by evaluating components of a total petroleum system (TPS), including source and reservoir rocks, seals and traps, and petroleum products geohistory. The interval assessed here is part of the Upper Jurassic–Cretaceous–Tertiary Composite TPS from Warwick and others (2007) in onshore lands and State waters of the U.S. Gulf Coast region (fig. 1). Within a TPS, strata in an assessment unit (AU) share similar stratigraphic, structural, and petroleum-charge histories. In this update of previous assessment work (Schenk and Viger, 1996; Dubiel and others, 2007), the USGS outlined 11 such AUs in the downdip Paleogene formations of the TPS (fig. 1). Eight AUs for conventional resources were quantitatively assessed, and three AUs for continuous (unconventional) resources were not quantitatively assessed.

Assessment of undiscovered conventional oil and gas resources in the downdip Paleogene formations, U.S. Gulf Coast, 2017