Jaboi Geothermal Field Boundary, Nanggroe Aceh Darussalam, Based on Geology and Geophysics Exploration Data

Abstract

Jaboi geothermal area is located at the most Western part of Indonesia at Weh island, Nanggroe Aceh Darussalam. The Weh island is located at the most northern part of Great Sumatra fault system which has NW-SE trend elongated from Weh island until Semangko bay about 1650 km within Sumatra island.
The heat source in the southern part is inferred from Leumo Matte partial melting magma about 1800 m in depth, which indicated by gravity survey. However, the geothermal surface manifestation is not clearly appeared at the northeastern part. Geolectrical survey carried out in the southern part give good information of shallow geothermal reservoir about 500 m depth. Furthermore, based on geochemical data the reservoir temperature is above 225 oC, which categorize as high temperature geothermal area. Therefore, Jaboi geothermal area is promising geothermal field to be develop for electric power plant in the near future, since the area is high entalphy geothermal area with shallow depth reservoir.