3D Natural State Modeling of Mount Iyang-Argopuro Geothermal Area, East Java, Indonesia

Dewi Asmorowati (Department of Petroleum Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional “Veteran” Yogyakarta, Sleman, Special Region of Yogyakarta, Indonesia.)
Allen Haryanto Lukmana (Department of Petroleum Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional “Veteran” Yogyakarta, Sleman, Special Region of Yogyakarta, Indonesia.)
Rizqi Mahfudz Prasetyo (Department of Petroleum Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional “Veteran” Yogyakarta, Sleman, Special Region of Yogyakarta, Indonesia.)

Journal of Geoscience, Engineering, Environment, and Technology
Vol. 6 No. 2 (2021): JGEET Vol 06 No 02 : June (2021)

Mount Iyang-Argopuro is one of the geothermal working areas in the East Java. Mount Iyang-Argopuro has the potential of 185 MWe of reserves and 110 MWe of resources. It is estimated to have a liquid dominated reservoir with temperature up to 250-275 oC. An early 3D natural state numerical model of Mount Iyang-Argopuro Field is created using TOUGH2 simulator in order to identify the undisturbed condition of reservoir and resource assessment. Since Mount Iyang-Argopuro geothermal area is still in the exploration stage, the model created based on based on geological, geophysical, and geochemical data. The model has an area 14 km x 8.2 km and 9180 m in thickness. The model consists of 7410 of rectangular cell blocks with the roughest cell size is 1000 m x 1000 m and the finest is 200 m x 500 m. The model is verified by matching the model temperature and pressure profiles to the calculated geothermometer temperature and pressure, which shows good match enough.