Brophy Occurrence Models

GEOTHERMAL ENERGY

Brophy Occurrence Models:

Paul Brophy has classified geothermal areas based on a variety of properties such as tectonic setting, controlling structures, and fluid properties.

Other definitions:Wikipedia Reegle

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, and are used for Property:BrophyModel.