Determination of Geothermal Fluid Characteristics in Pawan and Pendalian IV Koto Villages, Rokan Hulu Regency, Riau Province Using Geochemical Methods

Geothermal in Pawan and Pendalian IV Koto Villages is one of the post-volcanic geothermal areas Rokan Hulu Regency. This study aims to determine characteristics fluids estimate reservoir temperature based on geothermometer estimation. The research method used consisted several stages, namely field data collection fluid geochemical analysis. results from 12 hot springs plotted Cl-Li-B triangle diagram show that all water samples are dominated by Cl, indicating far reservoir. Cl-SO4-HCO3triangle shows bicarbonate types HCO3. Na-K-Mg immature area, which indicates has undergone a reaction with other elements or influence meteoric quite dominant. calculations geothermometer, estimated area range 160.69°-176.76°C, included medium-temperature system. this can be as potential for developing power plants.