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Chris Schenk
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2007-2008 Assessment Updates

The main objective of the National Assessment of Oil and Gas Project is to assess the potential for undiscovered oil and natural gas resources of the onshore United States. The last comprehensive National Assessment was completed by the USGS in 1995, and since 2000 the USGS has been re-assessing basins of the U.S. that are considered to be priorities for oil and gas resources rather than assessing all of the basins of the U.S. The maps ands tables accompanying this introduction represent the update to the National Assessment as of the end of December, 2006. Since 2000, the USGS has re-assessed 22 priority basins, and has plans to re-assess 10 more basins. These 32 basins represent about 97% of the discovered and undiscovered oil and gas resources of the United States. As each basin is re-assessed the assessment results are added to the tables, and these new values replace the assessment results from 1995. New assessments completed in 2006 include Alaska North Slope coalbed methane, the Sacramento Basin, the Eastern Oregon-Washington Province, and the conventional
oil and gas resources of the Powder River Basin.

The maps illustrate the mean values for undiscovered conventional, continuous, and coal-bed gas resources. The tables include the F95 and F5 values of the distributions of undiscovered resources in addition to the mean value.

Assessment Summary Tables

Comprehensive Resource Summary (PDF) Conventional, Continuous, Coal-bed Gas

Assessment Summary Maps

Mean Conventional Oil Resources (PDF)

Mean Conventional Gas Resources (PDF)

Total Mean Continuous Gas Resources (PDF) Inclusive of Coalbed Gas

Total Mean Continuous Gas Resources (PDF) Exclusive of Coalbed Gas

Mean Coalbed Gas Resources (PDF)

Mean Continuous Oil Resources (PDF)

Total Mean Oil Resources 2005 (PDF) New -- Total Mean Oil Resources 2008 (PDF, Includes Bakken-Lodgepole TPS)

Total Mean Gas Resources (PDF)