Integrated geophysical methods used to explore geothermal potential areas in Siogung-Ogung, North Sumatra, Indonesia

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Author : Muhammad Kadri, Nordiana Mohd Muztaza*, Mohd Nawawi Mohd Nordin, Muhammad Taqiuddin Zakaria, Farid Najmi Rosli, Mustapha Adeejo Mohammed, Siti Zulaika
Publication : Bulletin of the Geological Society of Malaysia
Page : 47 - 53
Volume Number : 76
Year : 2023
DOI : https://doi.org/10.7186/bgsm76202304

Bulletin of the Geological Society of Malaysia, Volume 76, November 2023, pp. 47 – 53

Integrated geophysical methods used to explore geothermal potential areas in Siogung-Ogung, North Sumatra, Indonesia

Muhammad Kadri1,2, Nordiana Mohd Muztaza1,*, Mohd Nawawi Mohd Nordin1, Muhammad Taqiuddin Zakaria1, Farid Najmi Rosli1, Mustapha Adeejo Mohammed3, Siti Zulaika4

1 Geophysics Section, School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia
2 Physics Department, Universitas Negeri Medan, Jl. Willem Iskandar / Pasar V, 20221 Medan, Sumatera Utara, Indonesia
3 Department of Physics, Federal University of Lafia, P.M.B 146, Maraba Akunza, Obi Road, Lafia, Nasarawa State, Nigeria
4 Faculty of Mathematic and Natural Sciences, Universitas Negeri Malang, 65145 Malang, East Java, Indonesia

*Corresponding author email address: mmnordiana@usm.my

Abstract: The manifestations of some hot springs in Siogung-Ogung, North Sumatra, Indonesia have increased speculation of likely geothermal sources. Therefore, integrated geochemical and geophysical methods were employed to identify the geothermal prospect of the area. Two-dimensional electrical resistivity and geomagnetic methods were used for the geophysical survey. The geochemical survey used three concentration measurements: geothermometer silica (SiO2), geothermometer Na-K, and geothermometer Na-K-Ca. A Wenner Schlumberger array with a 5-meter electrode spacing was used to acquire the 2-D resistivity data, which was processed using Res2Dinv software. The geomagnetic method was performed with a proton precession magnetometer, and the data were processed using Surfer to produce the magnetic residual map. The 2-D electrical resistivity results show that the area has low resistivity values (1-700 Ωm). The resistivity values from 1 to 100 Ωm could be due to the presence of hot waters in alluvium, and the resistivity values > 400 indicate andesite rock, which can function as a hot water conductor from the source. The magnetic residual map shows geomagnetic values from 150 nT to 360 nT, which infer the potentiality of geothermal within the study area. The geochemical results show that the reservoir temperature is 572 °C. Based on the integrated results, the study area has promising geothermal potential.

Keywords: Geochemical, 2-D resistivity, geomagnetic, Siogung – Ogung North Sumatra

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Manuscript received 3 March 2023;
Received in revised form 1 May 2023;
Accepted 17 July 2023
Available online 29 November 2023

DOI: https://doi.org/10.7186/bgsm76202304

0126-6187; 2637-109X / Published by the Geological Society of Malaysia.
© 2023 by the Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution (CC-BY) License 4.0.


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