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U.S. Department of the Interior U.S. Geological Survey Fact Sheet 2013–3101 November 2013 Assessment of Undiscovered Technically Recoverable Oil and Gas Resources of Puerto Rico and the Puerto Rico–U.S. Virgin Islands Exclusive Economic Zone, 2013 Introduction The U.S. Geological Survey (USGS) assessed the potential for undiscovered conventional oil and natural gas resources of Puerto Rico and the Puerto Rico–U.S. Virgin Islands Exclusive Economic Zone (EEZ; EEZ–Scan Scientific Staff, 1987) (fig. 1). The assessment was based on the postulated presence and viability of petroleum-system elements including petroleum source rocks (quality, source-rock maturation, generation, and migration), reser­ voir rocks (depositional environments, sequence stratigraphy, and petrophysical properties), traps (type and formation), and timing considerations. Using this geologic framework, the USGS defined three hypothetical petroleum systems and five assessment units (AUs) (table 1). This study assessed the potential for technically recoverable resources in new field discoveries; economic resources were not evaluated. Five hypothetical AUs were geologically defined to encom­ pass those areas of the EEZ that were further evaluated for potential oil and gas resources (fig. 1): North Coast Basin AU, San Juan Basin AU, South Coast Basin AU, North Mona Basin AU, and the Muertos Deformed Belt AU. The five AUs combine to form about 13 percent of the total area of evaluation. Most of the evalu­ ation area, including Atlantic oceanic crust, Caribbean oceanic crust, Puerto Rico Trench area, and shelf areas have no petroleum potential and were not considered further. In addition, there is no potential for oil and gas resources within the onshore area of Puerto Rico or the U.S. Virgin Islands. Using a geology-based assessment methodology, the U.S. Geological Survey estimated means of 19 million barrels of undiscovered, technically recoverable oil and 244 billion cubic feet of undiscovered natural gas in the Puerto Rico–U.S. Virgin Islands Exclusive Economic Zone. DOMINICAN REPUBLIC PUERTO RICO UNITED STATES CUBA SOUTH AMERICA ATLANTIC OCEAN PACIFIC OCEAN GULF OF MEXICO CARIBBEAN SEA Area of assessment –65° –64° –66° –67° –68° –69° –70° –71° 22° 21° 20° 19° 18° 17° 16° 15° North Coast Basin AU San Juan Basin AU South Coast Basin AU Muertos Deformed Belt AU North Mona Basin AU Mona Canyon Mu erto s Tr ough Puerto Rico Trench 0 50 100 KILOMETERS 0 50 100 MILES VIRGIN ISLANDS St. Croix ATLANTIC OCEAN CARIBBEAN SEA Venezuelan Basin Puerto Rico–U.S. Virgin Islands Exclusive Economic Zone Figure 1.  Map showing the extent of the Puerto Rico–U.S. Virgin Islands Exclusive Economic Zone (red line) and the five geologic assessment units (AUs) defined for this study (yellow polygons). World Petroleum Resources Project Resource Summary The areas represented by the AUs of the Puerto Rico–U.S. Virgin Islands EEZ, with the exception of the Muertos Deformed Belt AU, have been considered in previous oil and gas investi­ gations (Zapp and others, 1948; Monroe, 1973; Meyerhoff and others, 1983; Larue and Torrini, 1995). In this study the postulated petroleum-system elements of the North Coast Basin AU, San Juan Basin AU, South Coast Basin AU, and the North Mona Basin AU are highly uncertain resulting in low geologic probabilities (that is, the geologic probability of at least one oil or gas accumulation of 5 million barrels of oil equivalent or greater based on postulated petroleum-system elements) (table 1) and were not quantitatively assessed. The petroleum-system elements of the Muertos Deformed Belt AU, although largely uncertain and risked, resulted in geologic AU probability above the threshold of 10 percent, and the AU was assessed quantitatively (table 1). Within the portion of the Muer­ tos Deformed Belt AU that is part of the Puerto Rico–U.S. Virgin Islands EEZ, we estimated fully risked means of 19 million barrels of oil, 244 billion cubic feet of gas, and 6 million barrels of natural gas liquids. The assessment of undiscovered petroleum resources at the 95th and 50th fractiles (table 1) is zero and reflects the low geo­ logic AU probability of 20 percent and high geologic uncertainty on petroleum-system elements. For Further Information Supporting geologic studies of the Puerto Rico–U.S. Virgin Islands EEZ assessment are in progress. Assessment results are available at the USGS Energy Program Web site at http://energy. usgs.gov/OilGas/. References Cited EEZ–Scan Scientific Staff, 1987, Atlas of U.S. Exclusive Economic Zone, Gulf of Mexico and Eastern Caribbean Areas: U.S. Geo­ logical Survey Miscellaneous Investigations Series I–1864–B, p. B1–B58. Larue, D.K., and Torrini, R., 1995, Sedimentary basins and petro­ leum potential of Puerto Rico, in Miller, R.L., Escalante, G., Reinemund, J.A., and Bergin, M.J., eds., Energy and mineral potential of the Central American–Caribbean regions: Berlin, Springer-Verlag, Circum-Pacific Council for Energy and Mineral Resources, v. 16, p. 131–136. Meyerhoff, A.A., Krieg, E.A., Cloos, J.D., and Taner, Irfan, 1983, Petroleum potential of Puerto Rico: Oil and Gas Journal, v. 81, December 19, 1983, p. 113–120. Monroe, W.H., 1973, Stratigraphy and petroleum possibilities of mid-Tertiary rocks in Puerto Rico: American Association of Petroleum Geologists Bulletin, v. 57, no. 6, p. 1086–1099. Zapp, A.D., Berquist, H.R., and Thomas, C.R., 1948, Tertiary geol­ ogy of the coastal plains of Puerto Rico: U.S. Geological Survey Oil and Gas Investigations Preliminary Map No. 85, 2 sheets, scale 1:60,000. Puerto Rico–U.S. Virgin Islands EEZ Assessment Team Christopher J. Schenk, Ronald R. Charpentier, Timothy R. Klett, Stephanie B. Gaswirth, Janet K. Pitman, Michael E. Brownfield, Tracey J. Mercier, Craig J. Wandrey, and Jean N. Weaver. Table 1.  Puerto Rico–U.S. Virgin Islands Exclusive Economic Zone assessment results. [MMBO, million barrels of oil; BCFG, billion cubic feet of gas; MMBNGL, million barrels of natural gas liquids. Results shown are fully risked estimates. For gas accumulations, all liquids are included as NGL (natural gas liquids). Undiscovered gas resources are the sum of nonassociated gas (gas in gas accumulations) and associated gas (gas in oil accumulations). F95 represents a 95-percent chance of at least the amount tabulated; other fractiles are defined similarly. Fractiles are additive under the assumption of perfect positive correlation. TPS, Total Petroleum System; AU, Assessment Unit. Gray shading indicates not applicable] Total Petroleum Systems (TPS) and Assessment Units (AU) AU Proba- bility Field Type Total Undiscovered Resources Oil (MMBO) Gas (BCFG) NGL (MMBNGL) F95 F50 F5 Mean F95 F50 F5 Mean F95 F50 F5 Mean Paleogene TPS North Coast Basin AU (61170201) 0.04 Oil Not quantitatively assessed Gas San Juan Basin AU (61170202) 0.04 Oil Not quantitatively assessed Gas North Mona Basin AU (61170203) 0.02 Oil Not quantitatively assessed Gas Paleogene TPS South Coast Basin AU (61160201) 0.008 Oil Not quantitatively assessed Gas Upper Cretaceous-Tertiary TPS Muertos Deformed Belt AU (61160101) 0.20 Oil 0 0 120 19 0 0 236 39 0 0 9 1 Gas 0 0 1,296 205 0 0 30 5 Total conventional resources 0 0 120 19 0 0 1,532 244 0 0 39 6 ISSN 2327-6932 (online) http://dx.doi.org/10.3133/fs20133101