TY - JOUR
T1 - Investigation of deep-seated heat source through 3-D Magnetotelluric inversion in Arjuno-Welirang volcanic complex (East Java)
AU - Daud, Yunus
AU - Nuqramadha, Wambra Aswo
AU - Fitriastuti, Andini
AU - Darmawan, Dwiandaru
AU - Fahmi, Fikri
AU - Tifani, Magdalena Ari
AU - Tarmidi, Suwijanto
AU - Iskandar, Chevy
AU - Ibrahim, Riki Firmandha
N1 - Funding Information:
The authors thank PT Geo Dipa Energi (GDE) for providing the MT data as well as management of PT NewQuest Geotechnology for their support in providing MT data processing software. This work was also supported by the 2020 International Indexed Publications (IIP) Research Grant number NKB-1656/UN2.RST/HKP.05.00/2020 from Universitas Indonesia. Thank also to Ms. Fadhila Friany Putri for her assistance in formatting the paper. Special thanks to Dr. Christopher Bromley, Professor Martyn Unsworth, and all the reviewers for their suggestions in completing this paper.
Funding Information:
The authors thank PT Geo Dipa Energi (GDE) for providing the MT data as well as management of PT NewQuest Geotechnology for their support in providing MT data processing software. This work was also supported by the 2020 International Indexed Publications (IIP) Research Grant number NKB-1656/UN2.RST/HKP.05.00/2020 from Universitas Indonesia. Thank also to Ms. Fadhila Friany Putri for her assistance in formatting the paper. Special thanks to Dr. Christopher Bromley, Professor Martyn Unsworth, and all the reviewers for their suggestions in completing this paper.
Publisher Copyright:
© 2023
PY - 2023/9
Y1 - 2023/9
N2 - Arjuno-Welirang is a volcanic complex with quaternary ages in East Java Province, Indonesia. Various geothermal systems in the area might exist, from inactive to still-active hydrothermal systems and even volcanic (magmatic) hydrothermal systems. To differentiate the status of geothermal systems to be useful for further exploration programs, it is necessary to investigate the deep-seated heat source responsible for supporting heat to the existing geothermal systems. To achieve the objective, Magnetotelluric (MT) is used to image the subsurface resistivity variation down to about 20 km. A total of 117 MT stations have been included to fill the coverage area, especially in the eastern and southern regions of the research area. A series of data processing has been conducted to improve the quality of MT data, and 3-D inverse modeling has been applied after processing. In addition, the exploration is also focused on identifying the extension of the high-temperature reservoir with benign fluid. Based on the 3-D inversion of MT data, the updome of resistivity structure at the deeper level below Mt. Welirang is identified as a deep-seated heat source indication supporting the main upflow reservoir zone. A possible reservoir extension to the western side of Mt. Welirang–Mt. Kembar complex is more prominent as indicated by the resistivity pattern, supported by the Cangar and Coban hot springs occurrence as an indication of an outflow zone. This extension zone could be one of the focused areas for further exploration drilling to avoid magmatic fluid that probably exists at the main upflow zone.
AB - Arjuno-Welirang is a volcanic complex with quaternary ages in East Java Province, Indonesia. Various geothermal systems in the area might exist, from inactive to still-active hydrothermal systems and even volcanic (magmatic) hydrothermal systems. To differentiate the status of geothermal systems to be useful for further exploration programs, it is necessary to investigate the deep-seated heat source responsible for supporting heat to the existing geothermal systems. To achieve the objective, Magnetotelluric (MT) is used to image the subsurface resistivity variation down to about 20 km. A total of 117 MT stations have been included to fill the coverage area, especially in the eastern and southern regions of the research area. A series of data processing has been conducted to improve the quality of MT data, and 3-D inverse modeling has been applied after processing. In addition, the exploration is also focused on identifying the extension of the high-temperature reservoir with benign fluid. Based on the 3-D inversion of MT data, the updome of resistivity structure at the deeper level below Mt. Welirang is identified as a deep-seated heat source indication supporting the main upflow reservoir zone. A possible reservoir extension to the western side of Mt. Welirang–Mt. Kembar complex is more prominent as indicated by the resistivity pattern, supported by the Cangar and Coban hot springs occurrence as an indication of an outflow zone. This extension zone could be one of the focused areas for further exploration drilling to avoid magmatic fluid that probably exists at the main upflow zone.
KW - 3-Dimensional Inversion
KW - Arjuno-welirang
KW - Deep-seated heat source
KW - Indonesia
KW - Magnetotellurics (MT)
UR - http://www.scopus.com/inward/record.url?scp=85162097275&partnerID=8YFLogxK
U2 - 10.1016/j.geothermics.2023.102768
DO - 10.1016/j.geothermics.2023.102768
M3 - Article
AN - SCOPUS:85162097275
SN - 0375-6505
VL - 113
JO - Geothermics
JF - Geothermics
M1 - 102768
ER -