Numerical Simulation of a Vapor Core Geothermal System, Ungaran Geothermal Field, Indonesia

Abstract

The geoscience conceptual model shows that Ungaran geothermal system is a possible vapor core system and has an approximately 280oC reservoir temperature. In this paper, the numerical model of the Ungaran geothermal system was constructed based on the previous geoscience survey results in 2017 including geological survey results, geochemistry, geophysics, hydrology, and surface manifestations parameter. The aim is to build a numerical reservoir simulation and to update the conceptual model of Ungaran Geothermal Field. The numerical model of Ungaran geothermal prospect reservoir was simulated using TOUGH2 with EOS1 software. Based on this reservoir simulation result, the updated conceptual model of Ungaran geothermal system has been created, and it visualizes several updated information including the occurrence of subsurface geothermal components, fluid flow, and the distribution of subsurface temperature. This updated conceptual model might be used as an input of updated resource assessment of Ungaran Geothermal Prospect.