Geothermal Reservoir Identification in Way Ratai Area Based on Gravity Data Analysis
2021
Gravity research in the Way Ratai geothermal prospect area was conducted to
determine geothermal reservoirs, heat sources, and the structure of the geothermal reservoir. The
research carried out includes 3D inversion modeling of gravity data. The Bouguer anomaly in
the study area has 50 mGal to 120 mGal with low anomalies located in the southeast (Ketang
and Kelagian), Northeast (Gedong Air, Sungai Langka, Gunung Betung) areas, and in the
Pesawaran mountain area. The high anomaly is in Merawan – Hanuberak – Padang Cermin,
Sumbersari and Kaliawi. The horizontal gravity gradient map analysis shows a pattern of fault
structure trending northwest-southeast and southwest-northeast, according to the main fault
structure in the area. 3D inversion modeling obtains a density distribution between 1.8 g/cc to
3 g/cc with a low-density distribution in the south, Mount Pesawaran/Ratai, Gunung Betung, and
Sidoharum. The location of the manifestation is 9 km southeast of the Mount Ratai/Pesawaran
summit. The existence of geothermal reservoirs is estimated to be in the Lubuk Badak and
Miwung Hills areas which are located between the peaks of Mount Ratai/Pesawaran and
geothermal manifestations. This is supported by the low-density distribution in the area and the
resistivity map from audio-magnetotelluric data.
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