Integrated Research For Geothermal Prospect Zone Of Lawu Mountain Based On Geothermal Manifestation, Rock Alteration, Geochemical Analysis Of Fluid, Fault Fracture Density And Magnetotelluric Data

Rinaldo Siagian, Muhamad Maryudi, Verilla Purba

Abstract


Indonesia has abundant geothermal resources due to the number of volcanoes in its geographical region. The volcanoes in Indonesia stretch along Sumatra, Java, Nusa Tenggara, Sulawesi to the Moluccas. It causes Geothermal can be a prospective source of renewable energy in Indonesia. The research is focusing in Mount Lawu as one of the volcanoes in Indonesia that located in Karanganyar, Central Java. This research conducted by descriptive and analytical method. The geothermal reservoir is formed due to the geological structure in subsurface. The geological structure will be the way for the emergence of geothermal manifestations on the surface which reflecting the existence of geothermal activity. The parameters of the geothermal reservoir are determined by the permeability, temperature and reservoir volume. These parameters can be obtained from imaging-based investigation and surface geological data collection. This study also features an image investigation using digital elevation model data to create a fault fracture density (FFD) map which will show the distribution of the geothermal prospect zone. The prospect zone based on the FFD is validated with geochemical data to show outflow zones and geophysical data using magnetotelluric to show anomaly values. Through descriptive methods, manifestations and rock alteration research areas are around Fumaroles Candradimuka area, Post 4 Ascent of Mount Lawu, and Jenawi due to the analysis and interpretation of the alteration types argillic – advanced argillic. Based on Geothermometer Na-K-Ca, the temperature ranges from 174 - 177°C. Based on Geothermal manifestation, Rock alteration, Geochemical analysis of fluid, FFD method and Magnetotelluric data, it is known that Lawu geothermal prospect zone is located in The Southwestern part of the Lawu mountain slope around fumarole Candradimuka.


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References


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