Geothermal Reservoir Identification based on Gravity Data Analysis in Rajabasa Area- Lampung

Gravity research in the Rajabasa geothermal prospect area was conducted to determine geothermalreservoirs and faults as reservoir boundaries. The includes spectrum analysis separation of Bouguer anomaly obtain a residual anomaly, gradient using second vertical derivative (SVD) technique identify fault structures or lithological contact, 3D inversion modeling density distribution subsurface model. Analysis performed based on all results with supplementary data from geology, geochemistry, micro-earthquake (MEQ) epicenter map, magnetotelluric (MT) profiles. study found 3 (three) reservoirs Mount Balirang, west Rajabasa, south Pangkul Hot Spring, depth around 1,000-1,500 m ground level. Fault lithologies separate three reservoirs. location Balirang mountain corresponds model MEQ, temperature, resistivity data. heat source system is under which indicated by presence high-density values (might be frozen magma), high-temperature values, high number micro-earthquakes epicenters below peak Rajabasa.