Chemical and isotopic geothermometers to estimate geothermal reservoir temperature and vapor fraction
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According to thermodynamics, the equilibrium constant of a chemical or isotopic fractionation reaction is a state function and in general is a function of two state variables (e.g. temperature and pressure). Depending on the type of species involved in the reaction, it can be used as geothermometer and/or geobarometer. Using these thermodynamic concepts, the chemical and isotopic geothermometers: silica solubility, cation-exchange, methane breakdown, and oxygen-18 in dissolved sulfate and water are revised. The cation exchange geothermometer is a violation of laws of chemistry and thermodynamics, and is not used in this study. The Los Azufres reservoir temperature is in the range 190-310°C with an uncertainty of ±20°C and the vapor fraction is 13-85% with uncertainty of ±2%. This suggests the existence of liquid-vapor phase segregation within the reservoir.
Document Type:Trabajo in extenso congreso
Citation:Verma, M.P., 2015. Chemical and isotopic geothermometers to estimate geothermal reservoir temperature and vapor fraction, in: Proceedings World Geothermal Congress. Melbourne, Australia, p. 13.
UNESCO International Nomenclature: Geología-> Energía y procesos geotérmicos
 Geoquímica-> Geoquímica exploratoria
INIS/ETDE Thesaurus:Geothermal field