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Data Series 547

Improved USGS Methodology for Assessing Continuous Petroleum Resources

By Ronald R. Charpentier and Troy A. Cook

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This report presents an improved methodology for estimating volumes of continuous (unconventional) oil and gas resources within the United States and around the world. The methodology is based on previously developed U.S. Geological Survey methodologies that rely on well-scale production data. Improvements were made primarily to how the uncertainty about estimated ultimate recoveries is incorporated in the estimates. This is particularly important when assessing areas with sparse or no production data, because the new methodology allows better use of analog data from areas with significant discovery histories.

Revised November 9, 2012

First posted December 3, 2010

For additional information contact:
Director, Central Energy Resources Science Center
U.S. Geological Survey
Box 25046, MS-939
Denver Federal Center
Denver, CO 80225-0046

This report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

Charpentier, R.R., and Cook, T.A., 2010, Improved USGS methodology for assessing continuous petroleum resources, version 2.0: U.S. Geological Survey Data Series 547, 22 p. and program. Revised November 2012.





Changes from Previous Methodology

Input Form

Use of Analogs


References Cited

Appendix 1. Input data form for continuous accumulations

Appendix 2. Monte Carlo program for assessment of continuous accumulations

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