Attractive Potential of Geothermal System in Hululais Geothermal Field, Bengkulu, Indonesia

Abstract

Hululais Geothermal Field (HGF) is a liquid dominated system geothermal which is located on quaternary volcano-tectonic Hululais Volcanic Complex (HVC) and related to a prominent depression structure along an NW-SE trend axis along Bengkulu province. It is operated by PT Pertamina Geothermal Energy and currently ready to generate 2x55 MW.

The geology, geochemistry, geophysics and deep exploration drilling have been conducted to understand the geothermal system and locate the main components which control the system such as permeability, heat source, reservoir, caprock formation, and hydrothermal fluid flow direction. The Exploration phase result reveals that the permeability is associated with the formation and structural geology control. These permeability indicated by the presence of hot temperature above 260°C and fluid flows rate.

With this attractive subsurface condition and excellent exploration result, the discussion about HGF will be very interesting and can be a reference for geothermal development along the Sumatra especially in geothermal fields within a volcano-tectonic environment.