| Title | A New Leapfrog Model and Geothermal Reservoir Model of Waesano, Indonesia |
|---|---|
| Authors | Ando DEUHART, John O'SULLIVAN |
| Year | 2020 |
| Conference | World Geothermal Congress |
| Keywords | Waesano, 3D Geological Model, Natural State Simulation, Geothermal Reservoir Model |
| Abstract | Waesano field is a high terrain geothermal system situated in West Manggarai Regency, East Nusa Tenggara, Indonesia. The heat source is believed to come from volcanic activity beneath a large caldera lake in the centre of the Waesano Caldera. Geothermometers from nearby hot springs give a reservoir temperature of 230oC, with an associated power potential of 36 MWe. A comprehensive reservoir modelling study of Waesano geothermal area was carried out during this project in order to represent the subsurface condition of the system. Geology, geochemical and geophysics data from the Ministry of Energy and Mineral Resources of the Republic of Indonesia were used as inputs to the conceptual model of Waesano geothermal system that was developed. The conceptual model was then used to build a new 3D geological model using Leapfrog Geothermal and a new natural state reservoir model was set up using the AUTOUGH2 simulator. A good match to natural-state conditions was obtained by adjusting values of permeability and heat and mass inputs. The model was calibrated by comparing the model output to field data such as the locations of hot springs and temperature gradient information from two shallow wells. The new combined 3D geological model/reservoir model provides a valuable tool for supporting decision making aimed at ensuring the sustainable development and management of the system. It will also help with communication and engagement with the local community. |