2005. "Introduction", 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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Fossil fuels will remain an important source of energy for much of this century under most energy projections, although their abundance and potential shortages are debated. Their distribution, quantities, and availability will thus continue to be of paramount importance for world economies. Policy decisions made in the U.S. and elsewhere depend on detailed knowledge of petroleum resources and their distribution in the world. Therefore, petroleum resources are periodically reassessed, not just because new data become available and better geologic models are developed, but also because many non-geologic factors such as technologic advances, accessibility to markets, and geographic or societal constraints determine which part of the crustal abundance of petroleum will be economic and acceptable throughout some foreseeable future.
Detailed petroleum information was published in a recent world assessment of petroleum resources conducted by the U.S. Geological Survey (USGS) in their World Petroleum Assessment (WPA) 2000 (USGS, 2000). Two major components of world petroleum resources exclusive of the United States were assessed by the U.S. Geological Survey (USGS, 2000): undiscovered conventional resources and reserve (field) growth. This assessment provided estimates of the quantities of conventional technically recoverable oil, natural gas, and natural gas liquids (NGL), outside the United States, that have the potential to be added to reserves (Table 1). Many individuals and groups, such as the International Energy Agency (IEA 2000, 2001, 2002) and the Energy Information Administration of the Department of Energy (EIA, 2000, 2001a,b), Cavallo (2002), and Greene et al. (2003) use the USGS (2000) study as
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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.