Updating Reservoir Model of Ulumbu Geothermal Field Using Numerical Simulation
Fadhil K. Hammad (a), Sutopo (a)

(a) Geothermal Master Program, Institute Technology of Bandung, Jln. Ganesha No.6, Bandung 40132, Indonesia

Abstract

The Ulumbu geothermal field is the most promising prospect on the island of Flores from government program, which has a temperature of 230-239 C with steam cap overlying liquid dominated reservoir and possible reserve of 103 MWe from based on previous study. Reservoir model need to be updated comprehensively and periodically according to the latest data. Therefore, reservoir simulations and reservoir characteristics were compared with previous studies to mitigate risks in exploitation and update the reservoir model. The numerical reservoir model was carried out by using the TOUGH2 V.2.0 EOS 1 simulator with one calibration stages: three wells at different years during natural state. Calibration results indicate has alignment between the simulation model and observation data. The results were compared with the previous model, which had natural state calibration. The differences revealed in heat distribution, mass distribution, and fluid saturation conditions. These differences may be due to the availability of recent data, making the model results more representative.

Keywords: Numercial simulations, model comparison, natural state, Ulumbu Geothermal Field

Topic: Interdisciplinary Earth Science and Technology