Type F: Oceanic-ridge, Basaltic Resource

GEOTHERMAL ENERGY

Type F: Oceanic-ridge, Basaltic Resource:

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Brophy Occurrence Models

This classification scheme was developed by Brophy, as reported in Updating the Classification of Geothermal Resources.

• Type A: Magma-heated, Dry Steam Resource
• Type B: Andesitic Volcanic Resource
• Type C: Caldera Resource
• Type D: Sedimentary-hosted, Volcanic-related Resource
• Type E: Extensional Tectonic, Fault-Controlled Resource
• Type F: Oceanic-ridge, Basaltic Resource

Basaltic resources typically occur at oceanic-ridges, continental rifts, and hot spots. These geothermal systems are heated by magmatic activity and the exploited fluids are typically very high temperatures.

Examples of such resources include those in Hawaii, Iceland, and along the East African Rift.

According to Brophy, ocean-ridge, basaltic resources typically have the following properties:

• Topography – Rugged to flat
• Climate – Island – high precipitation
• Depth to resource –Shallow (1000-2000m)
• Surface manifestations - Common
• Permeability – High horizontal permeability, variable vertical permeability

Examples

Want to add an example to this list? Select a Geothermal Resource Area to edit its "Brophy Model" property using the "Edit with Form" option.

CSV

Geothermal Resource Area	Geothermal Region	Control Structure	Host Rock Age	Host Rock Lithology	Mean Capacity	Mean Reservoir Temp
Aluto-Langano Geothermal Area	East African Rift System - Ethiopian Rift Valley	Major Normal Fault		Basalt	7.5 MW7,500 kW <br />7,500,000 W <br />7,500,000,000 mW <br />0.0075 GW <br />7.5e-6 TW <br />	561.15 K288 °C <br />550.4 °F <br />1,010.07 °R <br />
Bjarnaflag Geothermal Area	Mid Atlantic Ridge			Basalt	3 MW3,000 kW <br />3,000,000 W <br />3,000,000,000 mW <br />0.003 GW <br />3.0e-6 TW <br />	573.15 K300 °C <br />572 °F <br />1,031.67 °R <br />
Hellisheidi Geothermal Area	South Iceland Seismic Zone - Mid Atlantic Ridge			Basalt	303 MW303,000 kW <br />303,000,000 W <br />303,000,000,000 mW <br />0.303 GW <br />3.03e-4 TW <br />	533.15 K260 °C <br />500 °F <br />959.67 °R <br />
Husavik (Hveravellir) Geothermal Area	Mid Atlantic Ridge			Basalt	2 MW2,000 kW <br />2,000,000 W <br />2,000,000,000 mW <br />0.002 GW <br />2.0e-6 TW <br />	395.15 K122 °C <br />251.6 °F <br />711.27 °R <br />
Kilauea East Rift Geothermal Area	Hawaii Geothermal Region	Intrusion Margins and Associated Fractures Fissure Swarms	Quaternary	Tholeiitic Basalt	47 MW47,000 kW <br />47,000,000 W <br />47,000,000,000 mW <br />0.047 GW <br />4.7e-5 TW <br />	575.15 K302 °C <br />575.6 °F <br />1,035.27 °R <br />
Krafla Geothermal Area	Mid Atlantic Ridge			Basalt	60 MW60,000 kW <br />60,000,000 W <br />60,000,000,000 mW <br />0.06 GW <br />6.0e-5 TW <br />	538.15 K265 °C <br />509 °F <br />968.67 °R <br />
Nesjavellir Geothermal Area	South Iceland Seismic Zone - Mid Atlantic Ridge			Basalt	120 MW120,000 kW <br />120,000,000 W <br />120,000,000,000 mW <br />0.12 GW <br />1.2e-4 TW <br />	568.15 K295 °C <br />563 °F <br />1,022.67 °R <br />
Olkaria Geothermal Area	East African Rift System - Kenya Rift				602 MW602,000 kW <br />602,000,000 W <br />602,000,000,000 mW <br />0.602 GW <br />6.02e-4 TW <br />	548.15 K275 °C <br />527 °F <br />986.67 °R <br />
Pico Vermelho-Ribeira Grande Geothermal Area	Mid Atlantic Ridge			Basalt	28.5 MW28,500 kW <br />28,500,000 W <br />28,500,000,000 mW <br />0.0285 GW <br />2.85e-5 TW <br />	511.15 K238 °C <br />460.4 °F <br />920.07 °R <br />
Reykjanes Geothermal Area	Mid Atlantic Ridge			Basalt	100 MW100,000 kW <br />100,000,000 W <br />100,000,000,000 mW <br />0.1 GW <br />1.0e-4 TW <br />	583.15 K310 °C <br />590 °F <br />1,049.67 °R <br />
Svartsengi Geothermal Area	Mid Atlantic Ridge	Fault Intersection		Basalt	76 MW76,000 kW <br />76,000,000 W <br />76,000,000,000 mW <br />0.076 GW <br />7.6e-5 TW <br />	513.15 K240 °C <br />464 °F <br />923.67 °R <br />