CONCEPTUAL MODEL OF THE “UBL” REGION GEOTHERMAL SYSTEM OF LAMPUNG PROVINCE USING DRILL LOG DATA AND SURFACE MANIFESTATION GEOCHEMICALS

Abstract

The UBL area is included in the Tanggamus Regency, Lampung province, with the potential for geothermal resources. The study of geothermal in the UBL area continues to increase along with the existence of geothermal operating areas that have been proven to produce geothermal energy that is capable of being used as a Geothermal Power Plant (PLTP). Therefore, this research was conducted to look in more detail through surface data and subsurface data so that it can provide an overview of the geothermal model in this "ULB" area. Surface fluid manifestations show 3 types of springs, namely chloride water, sulfate water, and bicarbonate water. The main reservoir of the study area is diorite-basalt intermediate rock. It is estimated that the reservoir temperature ranges from 184.31O – 200.56O C. The geothermal system model shows the upflow zone in the north of the study area covering the Aek Besuk area (AB2) and the outflow zone in the southern part of the Batu Rejo area (BR2).