THE USE OF MAGNETIC METHOD IN MODELING UNDER SURFACE STRUCTURE OF THE "X" AREA TO DETECT GEOTHERMAL POTENTIAL

• Main Author: Elviani Sitepu, Junita
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/54715
• Institution: Institut Teknologi Bandung

Indonesia is one of the countries with abundant renewable energy potential. One of these energies is geothermal energy which is estimated at 23.9 Giga watts. This potential can be used as a source of energy for electricity and community economic activities. However, currently the geothermal energy that is still being utilized is 8.9% or 2,130.6 MW. The government is targeting to increase geothermal utilization to 7,241.5 MW or 16.8% in 2025. Therefore, efforts are needed to explore areas that have geothermal potential in support of government targets using magnetic methods. This method can be used to interpret the invisible subsurface layers of the earth and the rock types. The purpose of this final project is to use magnetic methods to determine the distribution pattern of magnetic field anomalies, determine the condition of magnetic materials and display 2D modeling of magnetic data for the "X" region to detect the potential for Earth's heat. The magnetic data of this research is secondary data which is processed using microsoft excel software, magPick, surfer-10, and mag2DC. The interpretation of the research data is quantitative and qualitative. The results of quantitative interpretation using Mag2DC software with forward modeling by trial and error (trial and error) obtained rock types in the area "X" are rock, namely rhyolite and granite as well as pyroclastic rocks, namely pumice and trachydecite. While the results of the qualitative interpretation are based on the results of the magnetic anomaly contour which has positive and negative anomaly values. Negative anomaly results, namely purple to blue contours with a value range of -3000 nT to -500 nT, and dark green with a value range of -500 nT to 0 nT. The negative anomaly value indicates that in the "X" area there is a demagnetization process due to an increase in temperature, which indicates that there is geothermal potential below the surface of the "X" area. This information is in accordance with the geological information of the research area which has geothermal manifestations of hot springs and fumaroles.