Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure
Magnetotellurics (MT) is an important geophysical method for exploring geothermal systems, with the Earth resistivity obtained from the MT method proving to be useful for the hydrothermal imaging changes of the system. In this research, we applied the MT method to map the geothermal system of the Se...
| Main Authors: | , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/153730 |
| _version_ | 1826109988967284736 |
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| author | Marwan, Marwan Yanis, Muhammad Nugraha, Gartika Setiya Zainal, Muzakir Arahman, Nasrul Idroes, Rinaldi Dharma, Dian Budi Saputra, Deni Gunawan, Poernomo |
| author2 | School of Chemical and Biomedical Engineering |
| author_facet | School of Chemical and Biomedical Engineering Marwan, Marwan Yanis, Muhammad Nugraha, Gartika Setiya Zainal, Muzakir Arahman, Nasrul Idroes, Rinaldi Dharma, Dian Budi Saputra, Deni Gunawan, Poernomo |
| author_sort | Marwan, Marwan |
| collection | NTU |
| description | Magnetotellurics (MT) is an important geophysical method for exploring geothermal systems, with the Earth resistivity obtained from the MT method proving to be useful for the hydrothermal imaging changes of the system. In this research, we applied the MT method to map the geothermal system of the Seulawah Agam volcano in northern Sumatra, a site intended for the construction of a geothermal power plant with an estimated energy of 230 Mwe. Herein, 3D MT measurements were carried out, covering the entire area of the volcano and the various intersecting local faults from the Seulimeum segment in the NW–SE direction. Based on Occam 2D inversion, a conductive anomaly (<10 ohm∙m) near the surface was identified in response to specific manifestation areas, including the Heutsz crater on the northern side and the Cempaga crater on the southern side. A further conductive anomaly was also found at a depth of 1 km, which was presumably due to a clay cap layer covering the fluid in the reservoir layer below the surface, where the manifestation areas are formed at various locations (where faults and fractures are found) owing to the fluid in the reservoir rising to the surface. The MT modeling also revealed that the reservoir layer in Seulawah Agam lies at a depth of 2 km with a higher resistivity of 40–150 ohm∙m, which is the main target of geothermal energy exploration. At the same time, the heat source zone where magma is located was estimated to lie in two locations, namely, on the northern side centering on the Heutsz crater area and the southern side in the Cempaga crater area. A clear 3D structure obtained via Occam inversion was also used to visualize the hydrothermal flow in the Seulawah Agam volcano that originates from two heat source zones, where one structure that was consistent across all models is the conductive zone that reaches a depth of 5 km in the south in response to the regional faulting of the Seulimeum segment. Based on the MT research, we concluded that the volcano has the geothermal potential to be tapped into power plant energy in the future. |
| first_indexed | 2024-10-01T02:27:26Z |
| format | Journal Article |
| id | ntu-10356/153730 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:27:26Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1537302023-12-29T06:45:17Z Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure Marwan, Marwan Yanis, Muhammad Nugraha, Gartika Setiya Zainal, Muzakir Arahman, Nasrul Idroes, Rinaldi Dharma, Dian Budi Saputra, Deni Gunawan, Poernomo School of Chemical and Biomedical Engineering Engineering::Chemical engineering Magnetotelluric Phase Tensor Magnetotellurics (MT) is an important geophysical method for exploring geothermal systems, with the Earth resistivity obtained from the MT method proving to be useful for the hydrothermal imaging changes of the system. In this research, we applied the MT method to map the geothermal system of the Seulawah Agam volcano in northern Sumatra, a site intended for the construction of a geothermal power plant with an estimated energy of 230 Mwe. Herein, 3D MT measurements were carried out, covering the entire area of the volcano and the various intersecting local faults from the Seulimeum segment in the NW–SE direction. Based on Occam 2D inversion, a conductive anomaly (<10 ohm∙m) near the surface was identified in response to specific manifestation areas, including the Heutsz crater on the northern side and the Cempaga crater on the southern side. A further conductive anomaly was also found at a depth of 1 km, which was presumably due to a clay cap layer covering the fluid in the reservoir layer below the surface, where the manifestation areas are formed at various locations (where faults and fractures are found) owing to the fluid in the reservoir rising to the surface. The MT modeling also revealed that the reservoir layer in Seulawah Agam lies at a depth of 2 km with a higher resistivity of 40–150 ohm∙m, which is the main target of geothermal energy exploration. At the same time, the heat source zone where magma is located was estimated to lie in two locations, namely, on the northern side centering on the Heutsz crater area and the southern side in the Cempaga crater area. A clear 3D structure obtained via Occam inversion was also used to visualize the hydrothermal flow in the Seulawah Agam volcano that originates from two heat source zones, where one structure that was consistent across all models is the conductive zone that reaches a depth of 5 km in the south in response to the regional faulting of the Seulimeum segment. Based on the MT research, we concluded that the volcano has the geothermal potential to be tapped into power plant energy in the future. Published version 2021-12-23T04:26:47Z 2021-12-23T04:26:47Z 2021 Journal Article Marwan, M., Yanis, M., Nugraha, G. S., Zainal, M., Arahman, N., Idroes, R., Dharma, D. B., Saputra, D. & Gunawan, P. (2021). Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure. Energies, 14(19), 6091-. https://dx.doi.org/10.3390/en14196091 1996-1073 https://hdl.handle.net/10356/153730 10.3390/en14196091 2-s2.0-85115688269 19 14 6091 en Energies © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). application/pdf |
| spellingShingle | Engineering::Chemical engineering Magnetotelluric Phase Tensor Marwan, Marwan Yanis, Muhammad Nugraha, Gartika Setiya Zainal, Muzakir Arahman, Nasrul Idroes, Rinaldi Dharma, Dian Budi Saputra, Deni Gunawan, Poernomo Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure |
| title | Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure |
| title_full | Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure |
| title_fullStr | Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure |
| title_full_unstemmed | Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure |
| title_short | Mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure |
| title_sort | mapping of fault and hydrothermal system beneath the seulawah volcano inferred from a magnetotellurics structure |
| topic | Engineering::Chemical engineering Magnetotelluric Phase Tensor |
| url | https://hdl.handle.net/10356/153730 |
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