Clarification of Generation Mechanism of Distinct Pressure and Temperature Regimes in Geothermal Systems Around the Bandung Basin, Indonesia by Numerical Simulation

Abstract

This research aims to clarify the generation mechanism of distinct pressure and temperature regimes in the adjacent geothermal systems around the Bandung Basin, West Java, Indonesia. Deep downhole measurement data revealed an interesting feature of the system that the reservoir has different pressure and temperature regimes located within in a relatively close to each other in the field. To simulate such condition using information of geologic anomalies and TOUGH2, we constructed different hypothetical reservoir models by using many geologic, geophysical, and deep downhole pressure and temperature data. Through calibration of model parameters about permeability, heat and recharge magnitude and locations, and geometry of the geologic feature, the reasonable result was obtained by the small difference in pressure and temperature between the simulated and observed values. A merit of this result is that the most influential fault on driving the fluid flow in this system was identified.