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Integration of gravity and magnetic inversion for geothermal system evaluation in Suli and Tulehu, Ambon, eastern Indonesia

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Abstract

The geothermal field of Suli and Tulehu is located in the eastern part of the Ambon Island, administratively situated in central Maluku regency, Maluku province, Indonesia. In the year 2017, the measurement of the Earth’s gravity and magnetic field has been done to evaluate the geothermal system in Suli and Tulehu. The application of gravity and magnetic methods was applied to determine the subsurface geological model describing geothermal sources, reservoirs, and faulting as a fluid conduit in the study area. Bouguer anomalies are positive in the range from 93 to 105 mGal, while magnetic anomalies are negative to positive in the range from − 656 to 310 nT, generally southwest to northeast. Geothermal manifestations in the form of hot springs associated with low residual Bouguer and magnetic anomalies positioned on the Banda-Hatuasa, Banda, and Huwe fault lines related to the alteration zone. Euler deconvolution analysis of the complete Bouguer anomaly data shows the maximum depth of fault detected at 1200 m. Gravity and magnetic inversion show high density and susceptibility contrast of rocks associated with Eriwakang and Simalopu pyroclastic rocks as geothermal sources. Low density and susceptibility contrast is estimated to be geothermal reservoirs due to interactions with geothermal source rocks below. A geological conceptual model based on the inversion modeling of gravity and magnetic data provides clear and comprehensive information on the geothermal systems in Suli and Tulehu, Ambon, the eastern part of Indonesia.

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Data availability

The datasets used during the current study are available from the corresponding author with a reasonable request.

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Acknowledgments

The authors are grateful to the Ministry of Research and Technology, the Republic of Indonesia, for the opportunity for the first author to take a doctoral program in physics, at Universitas Gadjah Mada, Yogyakarta, in 2014. The authors also thank the government of Maluku province and PT PLN of Maluku and North Maluku regions, which have permitted this research in the Suli and Tulehu geothermal fields. Also thanks to Mr. Markku Pirttijarvi for developing the GRABLOX gravity software for inversion modeling, and Geosoft Inc., which prompted the invitation of authors to use Oasis Montaj software for magnetic inversion modeling for 1 month.

Funding

Data collection refinement and article writing were funded by the Ministry of Research and Technology, the Republic of Indonesia, through a dissertation research grant (1444/E3/LT/2017) with a contract (089/SP2H/LT/DRPM/2017).

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Authors and Affiliations

  1. Department of Physics, Faculty of Mathematics and Natural Sciences, Papua University, Manokwari, Papua Barat, 98314, Indonesia

    Richard Lewerissa

  2. Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, 55281, Indonesia

    Sismanto Sismanto & Ari Setiawan

  3. Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, 55281, Indonesia

    Subagyo Pramumijoyo

  4. Department of Physics, Faculty of Sciences and Technology, Nusa Cendana University, Kupang, Nusa Tenggara Timur, 85148, Indonesia

    Laura Lapono

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  1. Richard Lewerissa
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  2. Sismanto Sismanto
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  4. Subagyo Pramumijoyo
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  5. Laura Lapono
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Contributions

R.L. and S.S. formulated ideas and designs for gravity and magnetic data collection. A.S. reviewed its theory and modeling processing. S.P. evaluated the geology in Indonesia, as well as the geology of Suli and Tulehu in Ambon, while R.L. and L.L. collected a gravity and magnetic data; then, R.L. and S.S. compiled an article that was based on the input from A.S. and S.P.

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Correspondence to Sismanto Sismanto.

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The authors declare that they have no competing interests.

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Lewerissa, R., Sismanto, S., Setiawan, A. et al. Integration of gravity and magnetic inversion for geothermal system evaluation in Suli and Tulehu, Ambon, eastern Indonesia. Arab J Geosci 13, 726 (2020). https://doi.org/10.1007/s12517-020-05735-7

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  • DOI: https://doi.org/10.1007/s12517-020-05735-7

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