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Open-File Report 2011–1167

USGS Methodology for Assessing Continuous Petroleum Resources

By Ronald R. Charpentier and Troy A. Cook

Thumbnail of and link to report PDF (974 kB)Abstract

The U.S. Geological Survey (USGS) has developed a revised quantitative methodology for assessing resources in continuous (unconventional) petroleum deposits. Continuous petroleum resources include shale gas, coalbed gas, and other oil and gas deposits in low-permeability (“tight”) reservoirs. The methodology is based on an approach combining geologic understanding with well productivities. The methodology is probabilistic, with both input and output variables as probability distributions, and uses Monte Carlo simulation to calculate the estimates. The revised methodology is an improvement of previous USGS methodologies in that it better accommodates the uncertainties in undrilled or minimally drilled deposits that must be assessed using analogs. The publication is a collection of PowerPoint slides with accompanying comments.

First posted August 4, 2011

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

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Suggested citation:

Charpentier, R.R., and Cook, T.A., 2011, USGS Methodology for Assessing Continuous Petroleum Resources: U.S. Geological Survey Open File Report 2011–1167.

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