A Review of Methods Applied by the US Geological Survey in the Assessment of Identified Geothermal Resources

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Report: A Review of Methods Applied by the US Geological Survey in the Assessment of Identified Geothermal Resources

Abstract
The U. S. Geological Survey (USGS) is conducting an updated assessment of geothermal resources in the United States. The primary method applied in assessments of identified geothermal systems by the USGS and other organizations is the volume method, in which the recoverable heat is estimated from the thermal energy available in a reservoir. An important focus in the assessment project is on the development of geothermal resource models consistent with the production histories and observed characteristics of exploited geothermal fields. The new assessment will incorporate some changes in the models for temperature and depth ranges for electric power production, preferred chemical geothermometers for estimates of reservoir temperatures, estimates of reservoir volumes, and geothermal energy recovery factors. Monte Carlo simulations are used to characterize uncertainties in the estimates of electric power generation. These new models for the recovery of heat from heterogeneous, fractured reservoirs provide a physically realistic basis for evaluating the production potential of natural geothermal reservoirs.

Authors 
Colin F. Williams, Marshall J. Reed and Robert H. Mariner








Published 
U.S. Geological Survey, 2008



Report Number 
Open-File Report 2008-1296


DOI 
Not Provided
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Online 
Internet link for A Review of Methods Applied by the US Geological Survey in the Assessment of Identified Geothermal Resources

Citation

Colin F. Williams, Marshall J. Reed, Robert H. Mariner. 2008. A Review of Methods Applied by the US Geological Survey in the Assessment of Identified Geothermal Resources. U.S. Department of the Interior: U.S. Geological Survey. Report No.: Open-File Report 2008-1296.