Author : Helda Andayany*, Mirtha Yunitha Sari Risakotta
The appearance of the temperature on the surface of Haruku hot springs range 58 - 59°C while on Tehoru hot springs range 60 - 61oC. To estimate reservoir temperature then applied geochemical method based on analysis from compound of SiO2 that is implemented in geotermometer empirical equation (SiO2)p. The estimation results indicate that the reservoir temperature of Haruku range between 175 ± 0.9oC to 180 ± 0.9oC and reservoir temperature of Tehoru range between 185 ± 1.0oC to 190 ± 1.1oC. Thus, the geothermal system in Haruku and Tehoru is a medium temperature, containing high concentration of Sulfate ions and has an upflow area through the fractures. For that needed further exploration (pre feasibility study) in the Haruku and Tehoru areas as geothermal prospect areas. Key words: Geothermal equations; Reservoir temperature; Silica.
Dr. Arend L Mapanawang, Sp.PD, FINASIM, PhD