ESTIMATION OF GEOTHERMAL POTENTIAL ZONE BY ANALYZING MERCURY AND RADON GAS CONCENTRATION IN SOIL GAS AT WAYANG WINDU GEOTHERMAL FIELD, PANGALENGAN, BANDUNG REGENCY

• Main Author: IQBAL RAHMANSAH (NIM : 12114091), NURADIVA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29758
• Institution: Institut Teknologi Bandung

Alternative energy source that is renewable, sustainable, and eco-friendly is geothermal energy. <br /> <br /> The main obstacle of geothermal development is the cost of the exploration and development. In <br /> <br /> the exploration stage, the estimation of geothermal potential zone can be analyzed by mercury and <br /> <br /> radon gas measurement in soil gas. The methods are relatively cheap and effective for the <br /> <br /> deliniating potential zone from surficial survey. The survey was conducted at Wayang-Windu <br /> <br /> geothermal field, West Java, by measuring soil gas in 23 monitoring wells. Each measurment was <br /> <br /> conducted in four cycles for mercury and two cycles for radon in period of April to August 2018. <br /> <br /> Based on the research, it can be obtained that there are three spots which have the highest mercury <br /> <br /> concentration anomaly. Those are K-09 (20.8 ng/m3), K-26 (39.8 ng/m3), and NSD-03 (17.2 <br /> <br /> ng/m3). It’s also obtained that there are two spots which have the highest radon concentration, <br /> <br /> those are K-15 (31,268 Bq/m3) and NSD-04 (21,138 Bq/m3). The gas concentration obtained from <br /> <br /> the measurement was analyzed by correlating the values with some geological features e.g. the <br /> <br /> lithology, fault lines, and geothermal manifestations. It can be concluded that the mercury and <br /> <br /> radon gas concentration results are showing reverse spatial correlation. Mercury and radon gas <br /> <br /> concentrations are strongly influenced by the existence of fault strucutre especially on the fault <br /> <br /> where geothermal manifestation are presents. It can be distinguished that there are two major <br /> <br /> potential zones in the northern part based K-09 to K-11 mercury concentration and in the southern <br /> <br /> part around K-26. Separate with the two major potential zone, it can be found that there are three <br /> <br /> minor potential zones around NSD-03, K-19, and K-22 in the central zone of the research area.