RADON GAS CONCENTRATION ANALYSIS FOR GEOTHERMAL POTENTIAL ZONE DELINEATION IN PATUHA GEOTHERMAL FIELD, CIWIDEY, BANDUNG REGENCY

• Main Author: Muhammad Rashad, Rifki
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/47227
• Institution: Institut Teknologi Bandung

According to the data from PT Perusahaan Listrik Negara (Persero), the contribution of renewable energy to power plants can also be quite significant, already reaching 13.42% until May 2019. Indonesia is located in the circle of fire, which increases energy with geothermal energy resources. With this potential resources, Indonesia can improve it’s geothermal energy development. One of the first steps in enhancing the geothermal utilization in Indonesia is exploration activity. A preliminary exploration method for determining zones that have geothermal potential from the surface is by analyzing the concentration of radon gas in ground gas. In this study, delineation of the geothermal potential zone in the Patuha geothermal field was carried out by measuring the composition of radon from soil gas that has been taken out from 1,5 meter depth shallow wells. The radon measurement of 18 wells were conducted from April to August 2019. Measured radon gas concentrations are ranging from 190 Bq/m3 to 27,400 Bq/m3. Radon gas concentration with the highest values are at PPL05, PPL06, PPL07 and PA02. Radon gas concentration values are then correlated with lithology and geological structure. Radon gas concentration values have stong correlaton with geological structures i.e. faults. Whereas for lithology parameters, there is no correlation. Radon gas concentration values are used for delineation of geothermal potential zones. Based on this study, it can be concluded that there are two geothermal potential zones, namely at S-N directed zone in PPL07-PPL06 and at NW-SE directed zone in PPL05-PA02.