Results of Resource Assessment of Undiscovered Conventional Petroleum
2005. "Results of Resource Assessment of Undiscovered Conventional Petroleum", Global Resource Estimates from Total Petroleum Systems, Thomas S. Ahlbrandt, Ronald R. Charpentier, T. R. Klett, James W. Schmoker, Christopher J. Schenk, Gregory F. Ulmishek
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Volumes (statistical mean estimates) of undiscovered conventional oil, natural gas, and NGL (exclusive of the U.S.) as assessed in USGS (2000) are: Â∈¢ 649 billion bbl of oil (Figure 9) Â∈¢ 4669 tcf of natural gas (778 billion BOE) (Figure 10) Â∈¢ 207 billion bbl of natural gas liquids (NGL) (Figure 11) Table 1 summarizes the estimates of the ranges of volumes of undiscovered conventional oil, natural gas, and NGL for the world both exclusive and inclusive of U.S. petroleum resources. Lognormal probability distributions for the three commodities, exclusive of the U.S., are shown in Figures 9, 10, and 11. These estimates demonstrate that a significant volume of undiscovered petroleum is yet to be found in the world. The estimates of undiscovered resources of individual assessment units were aggregated into TPS, provinces, regions, and finally the world. Perfect positive dependency among estimates was assumed at the AU, TPS, province, country, and region levels. In aggregating the eight region-level sets of estimates to the world level, a positive dependency of 0.5 was assumed. Dependencies assumed for aggregations are described in USGS (2000) by Charpentier et al. (2000).
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Presented in this publication are the results of a major study of the petroleum resources of the world as analyzed by total petroleum systems. The distribution and volumes of resources available in these systems are critically important for the future of the world's economies.Â Geologic insights gained from studying these 149 systems and their constituent assessment units in 128 provinces and 96 countries, exclusive of the United States, allow a new look at petroleum accumulations and the rocks that are intimately associated with them. The geographic distributions of oil and natural gas systems show significant differences. Lists of new areas of potential and new estimates of resources make this a must-have addition to the petroleum geologist's library.