Abstract
Dieng-Batur is a geothermal resource located in west Mt. Sindoro and Mt. Sumbing, Central Java, Indonesia. The Dieng Unit 1 project of Geo Dipa Energy have successfully obtained 22 MW electricity from a geothermal power plant. Geological literature predicts that the Dieng geothermal system is controlled by geologic structures. Several geophysical methods can be used to monitor the geothermal area periodically. Monitoring has been carried out by implementing a magnetic method that aims to interpret the geological structure and create a 2.5D geological model of the Dieng-Batur geothermal area. Geological structure is predicted on the basis of upward continuation of both reduce to pole (RTP) and non-reduce to pole (non-RTP) total magnetic field anomaly data. Furthermore, the geological model was used to distinguish altered and non-altered bodies caused by geothermal activity. The results gave two main closures in both continuation maps and two cloistered bodies in the geological model. The total anomaly-field map with RTP showed low total anomaly flanked by high total anomaly. By contrast, the map without RTP showed high total anomaly flanked by low total anomaly. Both maps indicated two fault zones and geothermal activity. The geothermal activity was clearly visible from the geological model. The two cloistered bodies were distinguished by their susceptibility. The susceptibility of the lower body was predicted to be about 0.17 as a non-altered body, which was higher than the value of 0.003 for the upper body as an altered body. Furthermore, the size of the low total anomaly indicates that the size of the reservoir is about 1.2 km2, with optimum electricity production of 7.2–18.36 MWe for fluid and 13.68–34.884 MWe for fluid and rock.
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Acknowledgements
We would like to thank the Energy Security Department of Indonesia Defense University: Lieutenant General I Wayan Midhio, M.Phil, and Energy Security Co-5 supported, helped, and encouraged us during the preparing and writing process. We thank Mr. Imam Suyanto, M. Irfan Agus Faizal and assistants of the geophysics subdepartment of Universitas Gadjah Mada, who supported and helped us learn about the acquisition and interpretation processes. We also thank Alutsyah Luthfian for help preparing the references and composing the geological and topography maps, and GEOFISIKA 2011 for being the best mates during these 5 years.
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Rahayu, D.M., Supriyadi, I., El Hafidz Fatahillah, H., Sasongko, N.A., Octavian, A., Kuntjoro, Y.D. (2018). Magnetic Monitoring of the Dieng Geothermal Area. In: Sayigh, A. (eds) Transition Towards 100% Renewable Energy. Innovative Renewable Energy. Springer, Cham. https://doi.org/10.1007/978-3-319-69844-1_32
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DOI: https://doi.org/10.1007/978-3-319-69844-1_32
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