Potential for Enhanced Geothermal Systems In The Western United States

Basic Information
Author: Robertson-Tait, Ann, and Sass, J.H.
Description:Most presently active or contemplated hot dry rock (HDR) projects vary significantly from the original HDR concept of creating an engineered reservoir in an effectively impermeable medium. Instead, they form part of a spectrum of geothermal resources thatexhibit less-than-commercial productivity, but are not completely impermeable. A new working definition,"Enhanced Geothermal Systems"(EGS), is now being used to describe all but the high-gradehydrothermal portion of the geothermal resource spectrum. To promote the commercial development of these lower permeability and/or fluid-deficient resources, EGS research and development in the U.S. during the next few years is likely to include field experiments that target hot, low permeability zones within or near the margins of commercially developed hydrothermal systems. These systems are located in areas of elevated regional heat flow(Cascade Range, Basin and Range Province, Salton Trough, California Coast Ranges and Rio Grande Rift Zone), where temperatures of 250C can be reached at depths of 4 km or less. Potential sites for EGS experiments were identified with the objectiveof yielding immediate benefits to the geothermal industry while also contributing to the commercial development of an incrementally broader range of geothermal resources.
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Author Contact Information
Distributor Contact Information
Organization Name: Arizona Geological Survey
Street: 416 W. Congress St., Suite 100
City: Tucson
State: AZ
Zip: 85701
Phone: 520-770-3500
Geographic Extent
North Bounding Latitude: 38.9106
South Bounding Latitude: 34.6901
East Bounding Longitude: -116.719
West Bounding Longitude: -123.047