Karakteristik Fluida Panas Bumi Non Vulkanik di Pulau Sulawesi dan Pemanfaatannya untuk Pembangkit Listrik dengan Siklus Kalina
Non volcanic hydrothermal systems in Sulawesi have not been optimally developed, due to limitations of geoscience information. This research was carried out to provide base references of the fluid characteristics in non volcanic system that can be used to recommend prospect areas in Sulawesi to generate Kalina cycle power plant. The data used in this research are water chemistry and stable isotopes of surface manifestation, geological data to see the lithology and geological structures, the magnetotelluric data for estimating top of reservoir, and the gradient temperature data to estimate the temperature reservoir. The characteristics of geothermal fluid in Sulawesi are chloride, bicarbonate, and sulfate type or their combination with a pH of 6-9. Sulfate water is found in several places with a neutral pH. Using Na/K Fournier geothermometry, the reservoir temperature are between 100 and 200°C, but in an active fault zone can reach 230°C. Chemical characteristics in the non-volcanic system are heavily influenced by local lithology, whereas physical characteristics such as flow rate and temperature are influenced by the presence of geological structures. Upflow zone are characterized by the presence of chloride or chloride bicarbonate water at full or partial equilibrium, at boiling temperature, at chloride concentration of 500-4000 mg/L, contain of silica sinter, and high enrichment of stable isotopes. Outflow zone are characterized by the presence of bicarbonate or sulfate water in immature zone, containing travertine sinter, with varied concentration of chloride 10-500 mg/L. There are five prospect areas that can be developed with Kalina cycle based on the sufficient reservoir temperature i.e Lilli, Maranda, Suwawa, Pentadio, dan Massepe.