Supercritical geothermal reservoir revealed by a granite–porphyry system

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Abstract

To understand the geological properties of a supercritical geothermal reservoir, we investigated a granite–porphyry system as a natural analog. Quartz veins, hydrothermal breccia veins, and glassy veins are present in Neogene granitoids in NE Japan. The glassy veins formed at 500–550 °C under lithostatic pressures, and then pressures dropped drastically. The solubility of silica also dropped, resulting in formation of quartz veins under a hydrostatic pressure regime. Connections between the lithostatic and hydrostatic pressure regimes were key to the formation of the hydrothermal breccia veins, and the granite–porphyry system provides useful information for creation of fracture clouds in supercritical geothermal reservoirs.

Original languageEnglish
Pages (from-to)182-194
Number of pages13
JournalGeothermics
Volume63
DOIs
Publication statusPublished - 2016 Sep

Keywords

  • Geofluids
  • Granite–porphyry system
  • Mineral filling veins
  • Porphyry copper mineralization
  • Supercritical geothermal reservoir

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Geotechnical Engineering and Engineering Geology
  • Geology

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