Analisis Geokimia Fluida dan Pemodelan Sistem Panas Bumi Wilayah Prospek “X”, Jambi

Abstract

The “X” is located in the magmatic arc of the Barisan circuit which has the potential to produce geothermal energy. The area of Mount Turmeric is in the “X” region, found several hot manifestations such as hot springs, fumaroles, Solfatara, Ubahan rocks, and mud pools. Geochemical analysis of the geothermal work area of Sungai full-X is intended to identify the model of the geothermal system based on the interpretation of geological, geochemistry and geophysical data. Analysis conducted in the research area is analysis of geomorphological form, the structure identified from image Landsat, and rocks distribution. In the “X” the method used to measure temperature is using the method of Geothermometer Na-K-Ca (Fournier and Truesdell, 1973), Silica Geothermometer (Fournier, 1977), Na-K Geothermometer (Fournier, 1979; Giggenbach, 1988), K – Mg Geothermometer (Giggenbach, 1988), H2-CO2-Ar geothermometer with calculation using Powell 2010. Fluid type analysis and fluid flow patterns using the ternary diagram methods are Cl-SO4-HCO3, Na-K-Mg, N2-He-Ar and Cl-Li-B. Analysis of isotopes using the 18O-2D diagram method. Results of fluid samples taken from the manifestation of hot springs, found anomalies that are many content SO4 cause all the fluid type of condensate and chloride content is very low. In the research area of the Grau Rasau-X was conducted MT-TDEM survey and produced a 2D cross section. The River full Geothermal field has a system controlled by the Horst and Graben structures. The heat source comes from the magmatic activity of Mount Turmeric. The reservoirs start from 1.2 km with a rock cap thickness of 1.1 km in the form of clay stones. Yantze temperatures are estimated to be around 260oC – 330 oC.