APPLICATION OF GEOELECTRIC AND TRANSIENT ELECTROMAGNETIC (TEM) METHODS TO IDENTIFY SHALLOW CONDUCTIVE ZONES IN THE PATUHA GEOTHERMAL FIELD AREA, WEST JAVA

• Main Author: Aisyah, Nur
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66371
• Institution: Institut Teknologi Bandung

As time goes by, the demand for energy resources in Indonesia continues to increase. To meet the demand for energy resources, a sustainable and environmentally friendly management development of energy resources is needed, one of which is geothermal energy. Geothermal exploration is used to find out a potential geothermal in a prospect area. The geo-electricity and electromagnetic methods are the geophysical methods which commonly used to identify the presence of reservoirs in the subsurface through the value of resistivity. A low resistivity is related to the high conductivity zone that may be interpreted as a high permeable zone (fracture zone) which can be used as a hot fluid path in a geothermal system. In this study, geo-electricity and transient electromagnetic (TEM) surveys were conducted in the geothermal field area of Patuha, Ciwidey, West Java to identify the shallow structure by the resistivity distribution which may be related to the high permeability zone and a fluid pathway from the reservoir. Measurements are taken in areas that showed medium to high concentrations of radon gas. The data processing was conducted using RES2DINV and TEM-Researcher v.8.52 software. The modeling result from both geophysical methods showed the presence of low resistivity zones in the TTN area at the depth of 30 - 50 m from the measurement point with a resistivity range of 10 - 100 Ohm-m which is interpreted as fractures zone. This result was supported by the core logging from two TCH holes that showed fracturing zones in some parts.