Preliminary Examination of Geologic Relationships
2005. "Preliminary Examination of Geologic Relationships", 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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Although there have been individual analyses of source rock intervals and some elements of the total petroleum system (Klemme, 1986; Tissot et al., 1987; Klemme and Ulmishek, 1991; Perrodon, 1992; Magoon and Dow, 1994), the USGS (2000) study of world TPS provides many new geologic insights, petroleum volumes associated with the TPS, and a significant database for further studies. Some of these insights are discussed briefly for the elements of the TPS, and supporting data are shown in a series of Figures, maps, and Appendices.
In this study a large body of geologic information was assembled and synthesized for the TPS of the world included in the assessment. Eight geologic parameters from the geologic summaries for each of the assessment units (AU) were recorded in a spreadsheet (Appendix 4) and for each TPS (an aggregation of AU into their TPS) in Appendix 5. The geologic parameters are (1) source rock age, (2) source rock character, (3) peak maturation age, (4) reservoir rock age, (5) reservoir rock deposi- tional environment, (6) reservoir rock lithology, (7) seal lithology, and (8) trap type.
The data from the eight geologic parameters were examined in terms of frequency of occurrence in the world TPS and their correlation with petroleum resource volumes. Total petroleum resource volumes, in billion BOE, are further distinguished as (1) known (cumulative production plus remaining reserves, [data from Petroconsultants, 1996]); (2) undiscovered volumes (data from USGS, 2000); and (3) conventional endowment, which consists of the sum of known
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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.