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Banjarnegara Regency has several locations of geothermal potential. Geothermal manifestations are observed in 9 locations of Batur, Wanayasa, Kalibening and Susukan Districts. This study aims to characterize the geothermal fluid, reservoir temperature based on fluid geochemistry and anion-cation contents. Origin and type of fluid are analyzed based on data plotting on Cl-HCO3-SO4 and Cl-Li-B ternary diagrams. Reservoir temperature is based on Na-K-Ca, K-Na-Mg and Na-K geothermometer calculation. Results showed that the geothermal fluid has bicarbonate, chloride and sulfate types. This fluid is directly originated from the reservoir or has interaction with sedimentary rocks around. There are 4 identified reservoirs in the study area. Reservoir-1 is located in Gumelem Susukan Village of the southern part of Banjarnegara Regency with reservoir temperature of 81oC, and natural heat loss potential is 95.5 KW. Reservoir-2 is located around Wanayasa and Kalibening Districts with reservoir temperature between 222 – 264°C and natural heat loss potential is 4.691 MW. Reservoir-3 is located in the northern part of Dieng in Batur District with reservoir temperature of 137°C and natural heat loss potential is 246.4 KW. Reservoir-4 is located in the southern part of Dieng in Batur District with reservoir temperature between 334 – 374°C and natural heat loss potential is 26.58 MW.

buletin sumber daya geologi/buletin sumber daya geologi

PENENTUAN TIPE FLUIDA, GEOTERMOMETER RESERVOIR DAN HILANG PANAS ALAMIAH BERDASARKAN ANALISIS DATA GEOKIMIA PANAS BUMI DI KABUPATEN BANJARNEGARA, JAWA TENGAH