INTERPRETATION OF GRAVITY METHOD IN IDENTIFYING GEOTHERMAL POTENTIAL IN KADIDIA, SIGI DISTRICT, CENTER SULAWESI

• Main Author: Sahrul
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66903
• Institution: Institut Teknologi Bandung

The target for the use of new and renewable energy in Indonesia in 2025 is 23% and 31% in 2050. However, based on data from EBTKE-ESDM in 2020, the use of new and renewable energy is 10.9%. However, the target of 31% by 2050 is very large to achieve and geothermal is one of the alternative energy sources that has the potential to achieve this target. The Kadidia area, Sigi Regency, Central Sulawesi is the object of study in this research, based on data from the geological agency in 2012, it is predicted that there will be geothermal reserves of around 66 MWe. This study aims to model the geothermal system in the Kadidia area using the gravity method. The gravity method is used because it is able to identify the structure of the subsurface image by utilizing variations in the gravitational field to determine geothermal potential based on variations in rock density. The Bouguer anomaly map obtained illustrates the dominant structural pattern with a northwestsoutheast trend which is thought to be the controller of the emergence of hot springs in the Kadidia area. Furthermore, anomaly separation is carried out using the Gaussian method and Filter Assisted BEMD to generate regional and residual anomalies. The results of the Gaussian filtering method, namely the residual anomaly, show the distribution of the anomaly values that are considered to be in accordance with the geological information so that they are used as input in carrying out 2,5D forward modeling. The main components of the geothermal system in the Kadidia area obtained are: apart from heat from magma, plutonic granite rocks which are also estimated to be a heat source, volcanic rocks which are predicted to be reservoirs, while those suspected to be caprock are sedimentary layers in the form of lake deposits which are considered to have porosity and permeability. The low one.