Specific Characteristics of the Gravity Aanalysis Within the Ulubelu Geothermal System Tanggamus, Lampung Indonesia

Abstract

Interpretation of a gravitiy survey has been carried out in the Ulubelu geothermal system. Detailed data within the geothermal system have been collected, then processed and interpreted. Density is determined by measuring the cores and cuttings and interpreted using the Parasnis and Nettleton methods. Geobodies were modeled using a three dimensional gravity inversion program.
The gravity model shows that four specific models occur in the Ulebelu geothermal system. The caldera or graben groups outlined in the study area, are at an average dept of about 3 km below the surface. The permeable area outlined in in the survey surrounds Mt. Duduk and spreads out to the northern part of the study area.