Attainment of solution and gas equilibrium in Japanese geothermal systems

H. Chiba

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The geothermal fluids in seven Japanese geothermal systems are tested for attainment of aqueous and gaseous equilibrium. Equilibrium between CH4, CO2 and H2 is attained at high temperatures but not maintained to lower temperatures in most Japanese geothermal systems. The H2/H2S ratio is probably equilibrated with Fe-bearing minerals. Gaseous compositions are very good indicators to identify processes in the geothermal reservoir, such as boiling and dilution. Lastly, the major aqueous composition and pH of Japanese neutral Na-Cl type geothermal fluid are predictable if two variables (e.g., temperature and one of the cation activities) are provided. -from Author

Original languageEnglish
Pages (from-to)335-355
Number of pages21
JournalGeochemical Journal
Volume25
Issue number4
Publication statusPublished - 1991

Fingerprint

geothermal system
Gases
fluid
fluids
Bearings (structural)
gases
gas
boiling
dilution
Fluids
cation
minerals
Chemical analysis
cations
Temperature
Boiling liquids
Dilution
Minerals
Cations
mineral

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Attainment of solution and gas equilibrium in Japanese geothermal systems. / Chiba, H.

In: Geochemical Journal, Vol. 25, No. 4, 1991, p. 335-355.

Research output: Contribution to journalArticle

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