Identification of Permeability Geothermal Reservoir in an Active Fault Zone

Abstract

The Indonesian state on the ring of fire is an area that has geothermal potential. The existence of geothermal systems is generally closely related to the activities of volcanism and magmatism. Although producing geothermal systems occur in both compressional and extensional regions of strain in volcanic arcs. Volcanic areas have dominant lithology in the form of igneous rocks, and have complex geological structures. Rocks in the geothermal field are usually volcanic rocks. Which have small primary permeability of the fracture, the rock have a secondary permeability, so that the total permeability becomes larger. Fault is a fracture system that will help rocks have a large total permeability. Another relationship between fault and geothermal heat is that a fault create vertical permeability of a rock. So in the field of geothermal, there is usually a pattern of alignment between the location of a manifestation with the location of other manifestations in a similar fault system.