Geochemistry of hot springs in the Ie Seu'um hydrothermal areas at Aceh Besar district, Indonesia

Indonesia geothermal resources are the largest in the world, about 40 percent of the total geothermal resources worldwide with a potential energy of 28,617 MW. Geothermal energy is one of the renewable energy in the world that can be developed sustainably. This kind of energy is not only environmentally friendly but also highly prospective compared to fossil energy. One of the potential geothermal energy in Indonesia is Seulawah Agam geothermal field with some manifestation areas. The fluid type of Ie Seu'um manifestation was chloride (Cl-) obtained from the ternary diagram Cl--SO42--HCO3-, using UV-Vis spectrophotometry, argentometry and acidimetry method. The reservoir range temperature was 188,7 +/- 9,3 degrees C calculated using geothermometer Na-K-Ca, Na-K Fournier and Na-K Giggenbach by applying Atomic Absorption Spectroscopy method. This data processing was carried out using liquid chemistry plotting spreadsheet version 3 powell geoscience Ltd. 3 September 2012 by Powell & Cumming. The potential in the geothermal manifestation of Ie Seu'um was estimated about 50-100 MW (medium enthalpy).