EVALUATION OF GEOTHERMAL RESERVOIR CONDITIONS BASED ON WELL PADS GEOCHEMICAL DATA IN LX GEOTHERMAL FIELD

The research was conducted at the Geothermal Company Energy Lx Area. area includes three well pads of geothermal power plants, namely X1, X2, and X3, which are stratigraphically composed quaternary volcanic rocks. Based on geochemical data pad, it shows that chloride type fluid is in equilibrium/partial equilibrium with reservoir temperature range 230 – 300°C from silica Na-K geothermometer analysis. system a hydrothermal magmatic two-phase dominated by water. Evaluation conditions monitoring X3 pad decrease for last 3 years 320°C 2018 to 290°C 2020. Graphical analysis several chemical elements including Ca, Cl, SiO2, Boron HCO3 trend same pattern elements/compounds so can interpret there no mixing process occurs reservoir, especially drill pipe wall cement or groundwater. Utilization Field produces electricity capacity reaches more than 100 MW still being developed areas currently exploration stage.