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Book Chapter

Onshore, Offshore, and Country Allocations

Published:
January 01, 2005

Abstract

Economics of onshore petroleum exploration and production are very different from offshore. In the assessment process, allocations of estimated undiscovered volumes were made to onshore and offshore locations (where applicable) in order to enhance the utility of the results for further economic analysis. Offshore areas were deemed those that required offshore infrastructure, in either fresh or salt water.

Estimated volumes of onshore and offshore undiscovered oil by region (excluding the U.S.) are shown in Figure 96; of undiscovered natural gas, in Figure 97; and of NGL, in Figure 98. Most of the onshore undiscovered resources are expected to be in Regions 1 (Former Soviet Union) and 2 (Middle East and North Africa). Figure 99 shows that, at the world level, approximately equal amounts of each of the three undiscovered commodities are expected to be onshore and offshore. Figure 100 shows that for Regions 3 through 8, about one-fourth of the undiscovered volume of each commodity is expected to be onshore and nearly three-quarters of the potential is offshore. The offshore potential of each assessment unit (AU), total petroleum system (TPS), and province and the water depths associated with the offshore portion for each AU, is documented in USGS (2000). Most offshore provinces extend to water depths of 6562 ft (2000 m) with the exception of areas where exploration has already begun in deeper water depths. For example, the water depth limits of the AU were extended to 13,123 ft (4000 m) in the Campos Basin

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Contents

AAPG Memoir

Global Resource Estimates from Total Petroleum Systems

Thomas S. Ahlbrandt
Thomas S. Ahlbrandt
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Ronald R. Charpentier
Ronald R. Charpentier
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T. R. Klett
T. R. Klett
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James W. Schmoker
James W. Schmoker
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Christopher J. Schenk
Christopher J. Schenk
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Gregory F. Ulmishek
Gregory F. Ulmishek
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American Association of Petroleum Geologists
Volume
86
ISBN electronic:
9781629810430
Publication date:
January 01, 2005

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