Brophy Occurrence Models
From Open Energy Information
Brophy Occurrence Models:
Paul Brophy has classified geothermal areas based on a variety of properties such as tectonic setting, controlling structures, and fluid properties.
Type | Examples | Topography | Climate | Depth to Resource (m) | Surface Manifestations | Permeability |
Type A: Magma-heated, Dry Steam Resource | The Geysers | Rugged to mountainous | Variable | Usually deep (2500-4000) | Restricted | Low to moderate fracture permeability |
Type B: Andesitic Volcanic Resource | Philippines, Indonesia, Central and South America | Usually mountainous | Variable - usually high precipitation | Deep to moderate | Restricted, depending on depth and shallow ground water | Low to moderate fracture permeability - often high |
Type C: Caldera Resource | Medicine Lake, Valles Caldera, Los Humeros, Yellowstone | Ring fractures; often rugged with gentle floor topography | Variable | Moderate to shallow (<2500) | Common | Low fracture permeability - often thin tuff units |
Type D: Sedimentary-hosted, Volcanic-related Resource | Imperial Valley | Usually low topography | Arid; low precipitation | Intermediate (2000-3500) | Very restricted | Variable |
Type E: Extensional Tectonic, Fault-Controlled Resource | Great Basin | Rugged on upthrow; low on valley floor | Usually dry with low precipitation | Usually deep (2500-3500) | Usually restricted to fault traces | Dominantly fault-controlled |
Type F: Oceanic-ridge, Basaltic Resource | Hawai'i, Iceland | Rugged to flat | Islands - high precipitation | Shallow (1000-2000) | Common | High horizontal permeability, variable vertical permeability |
These values are part of Category:Brophy Occurrence Models[1], and are used for Property:BrophyModel.[2]
References
- ↑ Paul Brophy. 2007. A Brief Classification of Geothermal Systems. Sparks, Nevada. GRC Annual Meeting. Geophysical Techniques in Geothermal Exploration Workshop; nap.
- ↑ Colin F. Williams, Marshall J. Reed and Arlene F. Anderson. 2011. Updating the Classification of Geothermal Resources - Presentation. In: Thirty-Sixth Workshop on Geothermal Reservoir Engineering; 2011/02/02; Stanford, California. Stanford, California: Stanford University; p. 23