PEMODELAN INVERSI 2-D MENGGUNAKAN DATA MAGNETOTELLURIK DAERAH PANAS BUMI WAY SELABUNG, KABUPATEN OGAN KOMERING ULU SELATAN, PROVINSI SUMATERA SELATAN
2-D INVERSION MODELING USING MAGNETOTELLURIC DATA AT WAY SELABUNG GEOTHERMAL AREA, SOUTH OGAN KOMERING ULU REGENCY, SOUTH SUMATERA PROVINCE
Abstract
One of the physical properties of rocks that can be used to analyze a geothermal system is the resistivity of rock. Magnetotelluric method is one method that can be used to determine the resistivity of rock. MT measurements are carried out at 30 measuring points with north-south directed paths and the distance between measuring points is around 2000 meters. This research aims to do 2-D inversion modeling in determining location, delineation, and depth of the geothermal potential of Way Selabung. Based on the results of MT data analysis and 2-D inversion modeling, the Way Selabung geothermal system is in the graben structure zone. The manifestation of Way Selabung, Lubuk Suban and Selabung Damping hot water manifestations is formed due to intersection of Way Selabung, Kotadalam and Akarjangkang faults in a hydrogeological pattern in the outflow zone. 2-D modeling results show the top there is a group of low resistivity value <10 Ohm.m with a thickness of about 1500 meters from the surface which is interpreted as caprock. At the bottom there is a group of resistivity values of around 30-100 Ohm.m with a depth of 1500 meters to 1750 meters which is interpreted as a reservoir zone.
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References
Barber, A.J., Crow, M.J., Milsom, J., 2005. Sumatra: Geology, resources and tectonic evolution. Geological Society of London.
Baskoro, Y., 2016. Pemodelan 2-D Magnetotellurik Pada Sistem Panas Bumi Area “Parkir”, Kabupaten Oku Selatan, Sumatera Selatan. ETD Universitas Gadjah Mada.
Cagniard, L., 1953. Basic theory of the magneto-telluric method of geophysical prospecting. Geophysics 18, 605–635.
Grandis, H., 2013. Metoda Magnetotellurik (MT). Institut Teknologi Bandung, Bandung.
Grandis, H., 2010. Studi efek statik pada data magnetotellurik (MT) menggunakan pemodelan inversi 2-D, in: Prosiding Seminar Nasional Energi.
Grandis, H., 2009. Pengantar pemodelan inversi geofisika. Himpunan Ahli Geofisika Indonesia (HAGI).
Jones, A.G., A. D. Chave, G. Egbert, D. Auld, K. Bahr, 1989. A comparison of techniques for magnetotelluric response function estimation. J. Geophys. Res., 94, 14201-14213. https://doi.org/doi:10.1029/jb094ib10p14201.
Kusnadi, D., 2011. Laporan Akhir Survei Terpadu Geologi dan Geokimia Daerah Panas Bumi Way Selabung Kabupaten Ogan Kemiring Ulu Selatan, Provinsi Sumatera Selatan. Pusat Sumber Daya Geologi, Bandung.
Nurhadi, M., Munandar, A., Kusnadi, D., Zarkasyi, A., Suryakusuma, D., Sugianto, A., 2011. Survei Terpadu Geologi, Geokimia, dan Geofisika Daerah Panas Bumi Way Selabung, Kabupaten Oku Selatan, Provinsi Sumatera Selatan. Pusat Sumber Daya Geologi.
Phoenix Geophysics, 2007. V5 System 2000 MTU/MTU-A User Guide. Phoenix Geophysics. Phoenix Geophysics.
Rahadinata, T., Sugianto, A., 2014. Survei Magnetotellurik dan TDEM Daerah Panas Bumi Way Selabung, Kabupaten Oku Selatan, Provinsi Sumatera Selatan. PSDG.
Rodi, W., Mackie, R.L., 2001. Nonlinear conjugate gradients algorithm for 2-D magnettotelluric inversion. Geophysics Journal International 66(1):174-187.
Simarmata, R.S., Munandar, A., 2014. Survei Landaian Suhu Sumur WSL-2, in: Prosiding Hasil Kegiatan Sumber Daya Geologi.
Simarmata, R.S.L., Munandar, A., 2014. Survei Landaian Suhu Sumur WSL-1, in: Prosiding Hasil Kegiatan Sumber Daya Geologi. p. 10.
Simpson, F., Bahr, K., 2005. Practical magnetotellurics. Cambridge University Press.
Siripunvaraporn, W., 2012. Three Dimensional Magnetotelluric Inversion: An Introductory Guide for Developers and Users. SurvGeophys 33:5-27.
Sugianto, A., 2011. Laporan Akhir Survei Magnetotellurik Daerah Panas Bumi Way Selabung Kabupaten Oku Selatan, Sumatera Selatan. Pusat Sumber Daya Geologi, Bandung.
Takodama, I., Zarkasyi, A., Nurhadi, M., Dewi, R., 2018. Identifikasi Sistem Panas Bumi Daerah Wapsalit Berdasarkan Struktur Tahanan Jenis Data Magnetotellurik. Buletin Sumber daya Geologi.
Zarkasyi, A., Wahyuningsih, R., 2018. Pemodelan Reservoir Panas Bumi Daerah Dua Saudara, Kota Bitung, Provinsi Sulawesi Utara, Dengan Menggunakan Inversi 2-D Data Magnetotellurik. Buletin Sumber daya Geologi.
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