Abstract
A research to estimate geothermal reservoir temperature in Cubadak Area, Pasaman Regency, had been carried out as one of the early stages for geothermal system development in West Sumatera. 100 ml of fluids was examined from 20 hot springs in the vicinity of Cubadak area. Estimated reservoir temperature is calculated using geothermometer equation by determining Na, K, Ca, and SiO2 concentration. The Na, K and Ca concentration are measured by Atomic Absorption Spectroscopy (AAS), and the SiO2 concentrations is computed by Visible Spectroscopy. The results of this research shows that a suitable geothermometer in Cubadak Area is a Na-K geothermometer. Estimated average reservoir temperature ranges between 222.6°C and 234.9°C, computed from Na-K geothermometer equations developed by Fournier and Giggenbach.
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