| Title | Natural State Model of Kerinci Geothermal System, Jambi, Indonesia |
|---|---|
| Authors | Y. Prastika, J. O`Sullivan, M. O`Sullivan |
| Year | 2016 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | Kerinci geothermal field, natural state, computer modelling |
| Abstract | The Kerinci geothermal system is located in Jambi Province, Indonesia. The study area is located on part of the Great Sumatra Fault which means it is a fault-controlled system. Many surface manifestations are found along the faults, such as steaming ground, fumaroles, hot springs and mud pools. The development of Kerinci is problematic as the Sikai area is situated in the Kerinci Seblat National Park in which all deforestation-related acitivities are banned. The geothermal prospect is controlled by Pertamina Geothermal Energy (PGE) who have recently drilled an exploration well. In the present study a conceptual model was developed based on an analysis of information available in the literature. Then the conceptual model was used as the basis of a natural state, computer model of Kerinci. Manual calibration was used to improve the model by adjusting the model parameters, mostly the permeabilities, in order to obtain results corresponding to the conceptual model. However, the calibration process was difficult because little field data are available. Finally the model was used to carry out production simulations to understand the behaviour of the system under unconstrained exploitation and to predict the sustainable production level of the Kerinci geothermal system. Overall, the production rate decreases over a 25 year production period (either the total mass flow rate or steam flow rate) accompanied by a gradual decline in pressure. On the other hand, the enthalpy is almost stable throughout the period. |