Article Sidebar

Submitted
Nov 16, 2022
Accepted
Dec 30, 2022
Published
Dec 31, 2022
Download
PDF
Statistic
Read Counter : 365 Download : 227

Main Article Content

Abstract

3D delineation of the geological structure of the Geothermal prospect area in Kepahiang Regency has been conducted. The purpose is to get an overview of the subsurface and geothermal system in Kepahiang and map the alteration zone. Forward modeling and inversion were performed on geomagnetic data measured using a Proton Precession Magnetometer. The results of the analysis found that geothermal field prospects  are distributed in Babakan Bogor, Barat Wetan, Pematang Donok, Tangsi Duren, Sido Makmur, and Air Sempiang with an average reservoir depth of 900 m. Four types of rock formations were found including volcanic breccia rocks, basalt rocks, gabbro rocks, and altered rocks. The low anomalies located in Babakan Bogor, Barat Wetan, Kuto Rejo, Pematang Donok, Tangsi Baru, Sido Makmur, and Air Sempiang are thought to be caused by the active and inductively magnetized Musi Segment Fault due to the geothermal reservoir from the activities of Mount Kaba.

Article Details

How to Cite
Nanang Sugianto, Refrizon, & Simbolon, P. (2022). 3D Deliniation of Geological Structure of Kepahiang Geothermal Area, Indonesia. Gravitasi, 21(2), 69-80. https://doi.org/10.22487/gravitasi.v21i2.16142

References

  1. Arsadipura, S., Kholid, M., Djukardi, D., 2010. Penyelidikan Geofisika Terpadu Gaya Berat, Geomagnet Dan Geolistrik Daerah Panas Bumi Kepahiang, Kecamatan Kaba Wetan, Kabupaten Kepahiang, Provinsi Bengkulu, Prosiding Hasil Kegiatan Pusat Sumber Daya Geologi Tahun Anggaran 2010.
  2. F. Fahmi, Y. Daud, B. N. Suwardi, A. Zarkasyi, A. Sugiyanto, and E. Suhanto, “3-D Inversion of Magnetotelluric Data in Kepahiang Geothermal System , Bengkulu,” pp. 3–8, 2015.
  3. A. Sugianto and A. K. A.W, “Survei Magnetotellurik Daerah Pana Bumi Kepahiang Kabupaten Kepahiang, Bengkulu,” Pus. Sumber Daya Geol., p. 19, 2012, [Online]. Available: http://psdg.bgl.esdm.go.id/prosiding_2012/Buku 1 Energi/17.SURVEI MAGNETOTELLURIK DAERAH PANAS BUMI KEPAHIANG.pdf
  4. M. S. Kusnadi, Dedi; Nurhadi, “Penyelidikan Terpadu Geologi dan Geokimia Daerah Panas Bumi Kepahiang, Kabupaten Kepahiang, Bengkulu,” Pros. Has. Kegiat. Pus. Sumber Daya Geol., pp. 435–445, 2019.
  5. R. F. Herlambang and K. Novranza, “Pemetaan Kelurusan Menggunakan Remote Sensing Dan Korelasinya Terhadap Distribusi Manifestasi Permukaan Di Daerah Potensi Geothermal Kepahiang, Bengkulu,” Pros. Semin. Nas. Fis. SNF2016, vol. V, pp. SNF2016-EPA-57-SNF2016-EPA-64, 2016, doi: 10.21009/0305020412.
  6. I. Nurdiyanto, Boko; Wahyudi; Suyanto, “ANALISN DATA MAGNETIK UNTUK MENGETAIIUI STRUKTUR BAWAH PERMUKAAN bAERAH MANIFESTASI AIRPANAS DI LERENG UTARA GUNUNGAPI UNGARAN,” Pros. Himpun. Ahli Geofis. Indones. Pertem. Ilm. Tah. Ke-29, Yogyakarta, pp. 37–45, 2004.
  7. B. Nurdiyanto, A. Zarkasyi, and Y. Daud, “Application of MT and Gravity Method To Potential Analysis of Kepahiang Geothermal, Bengkulu,” Proceeding Conf. Appl. Appl. Electromagn. Technol., no. March 2019, pp. 11–15, 2018.
  8. R. B. Sihombing and R. Rustadi, “Pemodelan Dan Analisa Struktur Bawah Permukaan Daerah Prospek Panasbumi Kepahiang Berdasarkan Metode Gayaberat,” JGE (Jurnal Geofis. Eksplorasi), vol. 4, no. 2, pp. 159–172, 2018, doi: 10.23960/jge.v4i2.14.
  9. A. M. Lubis, D. Anggini, L. Puspitasari, and M. Farid, “Preliminary 2.5D Geothermal Distribution in Kepahiang Region Deduced by Inversion Magnetotelluric (MT) Data,” AIP Conf. Proc., vol. 2320, no. March, 2021, doi: 10.1063/5.0037575.
  10. M. Abdel Zaher, H. Saibi, K. Mansour, A. Khalil, and M. Soliman, “Geothermal exploration using airborne gravity and magnetic data at Siwa Oasis, Western Desert, Egypt,” Renew. Sustain. Energy Rev., vol. 82, no. June, pp. 3824–3832, 2018, doi: 10.1016/j.rser.2017.10.088.
  11. R. T. Suci and A. Putra, “Pemetaan Struktur Bawah Permukaan di sekitar Manifestasi Panas Bumi Desa Sungai Tutung Kerinci Menggunakan Metode Geomagnetik,” J. Fis. Unand, vol. 10, no. 4, pp. 540–547, 2021, doi: 10.25077/jfu.10.4.540-547.2021.
  12. W. M. Maubana, S. Maryanto, I. W. Utami, and A. Nadir, “Reservoir magnetic anomaly at geothermal area of mount Pandan, East Java, Indonesia,” Int. J. Renew. Energy Res., vol. 9, no. 2, pp. 887–892, 2019, doi: 10.20508/ijrer.v9i2.9182.g7655.
  13. M. Syukri, M. M. Nordiana, R. Saad, Marwan, and N. A. Kamaruddin, “Magnetic method used in geothermal exploration in Ie-Seu ’Um, Aceh Besar (Indonesia),” Electron. J. Geotech. Eng., vol. 19 J, pp. 2149–2157, 2014.
  14. S. N. K. T, “Ulasan Tentang Landasan Fisis Anisoropi Magnetik Pada Batuan,” Ekp, vol. 13, no. 3, pp. 1576–1580, 2015.
  15. A. Idral, “Pemaparan Hasil Kegiatan Lapangan Subdit Panas Bumi 2005,” J. Penyelid., pp. 4–6, 2005.
  16. I. N. Manyoe, D. A. Suriamihardja, U. R. Irfan, S. S. Eraku, S. S. S. Napu, and D. D. Tolodo, “Geology and 2D modelling of magnetic data to evaluate surface and subsurface setting in Bongongoayu geothermal area, Gorontalo,” IOP Conf. Ser. Earth Environ. Sci., vol. 589, no. 1, 2020, doi: 10.1088/1755-1315/589/1/012002.
  17. P. Simbolon, R. Refrizon, and N. Sugianto, “Peta Sebaran Intensitas Anomali Magnetik Di Daerah Prospek Geothermal Kepahiang Berdasarkan Survei Metode Geomagnet,” Newton-Maxwell J. Phys., vol. 1, no. 1, pp. 7–12, 2020, doi: 10.33369/nmj.v1i1.14290.
  18. Gafoer, S., Amin, T. C., & Pardede, R. 1992. Peta Geologi Lembar Bengkulu dan Sekitarnya. Bandung: Pusat Survei Geologi.
  19. Natawidjaja, D. H., K. Sieh, M. Chlieh, J. Galetzka, B. W. Suwargadi, H. Cheng, R. L. Edwards, J. Avouac, and S. N. Ward. 2006, Source parameters of the great Sumatran megathrust earthquakes of 1797 and 1833 inferred from coral microatolls, J. Geophys. Res., 111, B06403, doi:10.1029/2005JB004025
  20. Blakely, R.J,. 1995. Potential Theory in Gravity and Magnetic Applications. Cambridge University Press. New York.
  21. Telford, W. M., Geldrat, L. P., & Sheriff, R. E. 1990. Applied Geophysics Second Edition. New York: Cambridge Univerity Press.