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All Journal Jurnal Pendidikan Fisika dan Teknologi Indonesian Physical Review
Rahmawati, Nurul 'Ilmi
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Education Physics

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DELINEATING RESISTIVITY VALUES OF POTENTIAL GEOTHERMAL AREAS ALONG THE BOGOR FAULT USING 2D MAGNETOTELLURIC INVERSION Hardiansa, Debi; Farid, M; Hadi, Arif Ismul; Al-Ansory, Andre Rahmat; Raihana, Hana; Rahmawati, Nurul 'Ilmi
Indonesian Physical Review Vol. 8 No. 2 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i2.431

Abstract

Kepahiang Regency, located in an active fault zone, has great geothermal potential with an estimated capacity of up to 154 MW(e), making it a strategic renewable energy source to be developed. This research discusses the geothermal potential in the Kabawetan area, Kepahiang, Bengkulu. The main objective of this research is to evaluate the potential of geothermal resources around the Bogor segment by analyzing the subsurface structure using the Magnetotelluric inversion method and 2D resistivity modeling, in order to identify prospective geothermal reservoir zones. It can evaluate the potential of geothermal reservoirs in Kepahiang. The method used is the Magnetotelluric method, which utilizes the Earth's natural electromagnetic field to determine the distribution of resistivity in the subsurface. The results of 2D modeling with the MT method show potential zones associated with variations in subsurface thermal conditions and the presence of conductive clay minerals with resistivity values between 0.14-1 Ωm. These minerals are thought to be associated with the overburden (reservoir) of the geothermal system that has a depth of 2-4 km. The subsurface layer containing hot water and steam originating from heat emitted from the earth's core with a resistivity value of 2.5-45 Ωm at a depth of 1-4 km is thought to be caprock in the geothermal system, a resistivity value of 120-800 Ωm is thought to be hot rock with a depth between 1.5-10 km. It is estimated that there is a type of andesite rock that has been fractured as a reservoir of geothermal fluid. The findings of this research are expected to contribute to renewable energy as an alternative energy in the future, not only for energy needs but also for regional economic development through tourism and to support sustainable governance.
Identification of Groundwater Presence Using ERT (Electrical Resistivity Tomography) in Berkas Village, Teluk Segara Sub-district, Bengkulu City Fauzi, M. Wilzam; Suhendra, Suhendra; Refrizon, Refrizon; Halauddin, Halauddin; Rabbani, M Rifqi; Al Rafly, Tegar; Al Ansory, Andre Rahmat; Raihana, Hana; Rahmawati, Nurul 'Ilmi; Tri Utami, Olga
Jurnal Pendidikan Fisika dan Teknologi (JPFT) Vol 10 No 2 (2024): July - December
Publisher : Department of Physics Education, Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpft.v10i2.7717

Abstract

Kelurahan Berkas is a coastal area in Teluk Segara Sub-district, Bengkulu Regency, Bengkulu Province. The purpose of this research is to identify the presence of groundwater in Kelurahan Berkas. The method used was resistivity geoelectric method with Wenner-Schlumberger configuration. This research applied three lines, the first in the Southwest-Northeast direction and the second in the East-West direction, with a length of 240 metres each. The results show that the free aquifer layer in the first pass has a resistivity value of 1.61 Ω.m to 3.98 Ω.m at a depth of 7 metres to 24 metres. While the second pass has a resistivity value of 3.17 Ω.m to 9.23 Ω.m at a depth of 8 metres to 36.9 metres and the third pass has a resistivity value of 1.62 Ω.m to 7.05 Ω.m at a depth of 2 metres to 20 metres. The results also show that the lithology of the aquifer layer in the study area is interpreted as clay, sandy clay, and sand. This layer contains groundwater that has been affected by seawater intrusion. The influence of this intrusion causes the groundwater to have a relatively low percentage of salinity so that the groundwater at the research location feels brackish. The existence of seawater intrusion is caused by the kelurahan berkas right on the coast so that the kelurahan berkas community lacks clean water, so the well water becomes brackish, therefore with this research the community can find out the location or point where there is groundwater.
Co-Authors Al Ansory, Andre Rahmat Al Rafly, Tegar Al-Ansory, Andre Rahmat Arif Ismul Hadi Fauzi, M. Wilzam Halauddin Halauddin Hardiansa, Debi M Farid Rabbani, M Rifqi Raihana, Hana Refrizon Refrizon Suhendra Suhendra Tri Utami, Olga