Interpretation of Subsurface Geological Structure of Massepe Geothermal Area Using Resistivity Data

Abstract

Massepe geothermal area is located in Sidenreng Rappang Regency, South Sulawesi Province, Indonesia, approximately 194 km north of Makassar.
The geology of the area consists of Miocene marine sedimentary rock, Tertiary volcanic rock and Quaternary of lava domes that are interpreted as the heat sources of the geothermal systems of the area. The geothermal features include hot springs, volcanic gas bubbling and hydrothermal altered rock.
The morphology is high relief terrain composed of Tertiary volcanic rock that occupies the west side, and flat area composed of Tertiary marine sedimentary rock at the east side, where some geothermal surface manifestations occur.
Resistivity data show indications of geological structures on the sedimentary basin such as lava domes, rock bedding and normal faults. These fault structures are interpreted to control geothermal surface manifestation of the area.