2005. "Field Analyses", 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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To understand where the greatest potential for undiscovered resources lies, a summary of the estimated largest undiscovered fields from the USGS (2000) assessment is included here (Appendices 6, 7). Additionally, analyses of the depth, pressure, and temperature attributes of the world’s oil and natural gas fields provide insights into the world distribution of these parameters.
Appendices 6, 7, 8, and 9 present information about possible locations of large, undiscovered fields in the world by assessment units (AU). Because of the extreme skewness of field-size distributions, much uncertainty exists as to the size of the largest undiscovered fields. The procedure used provides a distribution that shows the uncertainty for size of the largest undiscovered field for each AU (Charpentier and Klett, 2000). Because of high uncertainty, the statistics in Appendices 6 through 9 should be viewed for their relative, rather than absolute, value.
Appendix 6 presents a ranked list of AU by the estimated size of the largest undiscovered oil field. Appendix 7 shows a similar list for the largest undiscovered natural gas field. Appendix 8 shows the ranking of AU by number of expected oil fields with at least 1024 MMBO. Appendix 9 illustrates AU ranking by number of expected natural gas fields with at least 6144 bcf (1024 million BOE).
All four of these appendices show that many of the largest fields remaining to be discovered are expected in Region 2, the Middle East and North Africa. East Greenland is also high on the oil ranking (Appendix 6)
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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.