Dikes as Hydrothermal Reservoirs in Sedimentary Basins
- Key words
- dike, sedimentary basin, hydrothermal reservoir, permeability, Kii Peninsula, Hongu hot spring
- Location
- Hongu Hot Spring, Japan
- Conference
- Asian Geothermal Symposium
- Year
- 2006
- Session
- Session-5 Geology, Geochemistry and Tectonics
- Language
- English
Full text
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Abstract
Dikes often play a key role of permeable reservoirs in impermeable host rocks. Cooling joints penetrate the entire dike body, providing a permeable conduit for aquifer. The dike reservoir phenomenon is typically observed in the flyschtype sedimentary basins where sediments are commonly impermeable. If we have such a deep aquifer conduit as dikes from the surface to a depth from a several km to a few tens km in a high geothermal gradient region, hydrothermal convection will inevitably occur. The genesis of the Hongu hot spring is a typical example for the dike reservoir phenomenon.
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