MODELLING AND INTERPRETATION OF SUBSURFACE IN MUARA LABOH GEOTHERMAL AREA WITH GRAVITY METHOD

• Main Author: Ode Aisyah Kahar, Wa
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74865
• Institution: Institut Teknologi Bandung

The gravity method is a method which its primary parameter depends on the density. The gravity method is used to seveal cases, for example identifying faults or investigate subsurface structure in the geothermal area. On the geothermal area, the area where the heat source located is associated by low density, so that its Bouguer anomaly is low. For the most part of this thesis, the modelled case of geothermal area contains faults and intrusive rock. The modelling used here is forward modelling. This model is based on variation of the rock density. There are two models with the maximum depth equal 2500 metres. Next, two models will be compared. The assumption applied here is no heat source, yet an intrusion rock exists in the deepest surface. The modelling system used is five surfaces system with the granite as an intrusion rock, the reservoir(s) are surrounded by andesite and sandstone, the caprock area consists shales, and the graben exists. The result of the modelling shows the curve of the distance vs anomaly response.