MODEL OF TEMPERATURE DISTRIBUTION GEOTHERMAL PESANGGRAHAN GEOTHERMAL SYSTEM, CENTRAL JAVA, INDONESIA
Publication Date : 01/12/2018
The Pesanggrahan geothermal field is located at Central Java, Indonesia. A numerical model proposes to understand the temperature distribution since the steady state condition up to transient model. The first step of research method was running the temperature simulation to determine the temperature background from the surface to the bottom of volcanic body on the steady state model. We assumed that there is no magma in the steady state model. Background temperature distribution and pattern of mass fluxes calculate for 100,000 years to get the steady-state condition. The next step is modelling temperature and pressure distribution caused by the magma intrusion. The final result shows that high-temperature reservoir has a good correlation to the geothermal manifestations of Sileri that has been research by Layman et.al. (2002), we interpret that the reservoir is located at a depth between 2000 - 2300 m with a temperature range from 300-350 °C. The intrusion model also contributed the mass flux flow pattern of water from the reservoir to the surface as the upflow zone (that is Sileri hot water manifestation and the outflow zone was discharged to the south and the north directions.
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