TEMPERATURE ANALYSIS OF TINGGI RAJA GEOTHERMAL RESERVOIR, SIMALUNGUN DISTRICT

Reservoir temperature measurements have been carried out using the empirical geotermometer method at the High Raja Geothermal Simalungun district in order to determine the value of the High Raja geothermal reservoir temperature. The study was conducted using the Na-K geotermometer method, the Na-K-Ca-Mg geotermometer, a Na-K-Ca-Mg geotermometer to obtain the temperature value of the geothermal reservoir. The results of the study Based on the empirical Geotermometer equation show the surface temperature of hot water at three points showed that at the point I obtained hot water surface temperature of (65.0 ± 0.5°C) with a surface pH of 5.2 hot water, point II the hot water surface temperature of (65.0 ± 0.5°C) with a large surface pH of hot water 5.8, and point III the surface temperature of hot water is (63.0 ± 0.5°C) with a large pH surface of hot water 5.8. The average concentration of chemical elements contained in hot water samples include Ca for (255.33 mg / L), K for (150 mg / L), Mg for (43.63 mg / L), Na for (34, 13 mg / L) and the average temperature of the reservoir that can be received using the Na-K-Ca Geotermometer is a temperature of 182.89921°C