2D Joint Inversion of Gravity and Magnetic Data to Evaluate a Geological Structure in Tanimbar Island

Arkanu Andaru, Praditiyo Riyadi, Muhammad Nafian

Abstract


The need for hydrocarbon energy, especially oil and gas, requires continuous exploration of hydrocarbon reserves, especially in eastern Indonesia. Tanimbar Islands, Maluku was chosen to be the research area because of its complex subsurface geology and is located on the fold thrust belt resulting from tectonic evolution. In this research, an innovation is carried out using joint inversion modeling by correlating physical parameters from two different geophysical data, which are gravity and geomagnetic. The purpose of this research is to determine the subsurface mapping of the research area, determine the density and susceptibility values of rocks, and determine the structural patterns that exist in the subsurface. The results of subsurface mapping of the Tanimbar Islands based on the results of Joint Inversion modelling have found a geological structure pattern in the form of a fold thrust belt due to the Banda Arc subduction zone. In section A-A', there is a sequence of fold thrust belt with 10 structural patterns, including 6 structures in the northwest-southeast direction and 4 structures in the northeast-southwest direction. In section B-B' there are 9 structural patterns in the northeast-southwest direction. High anomalies obtained density values ranging from 2.77 - 2.81 gr/cm3 and susceptibility ranging from 0.00125 - 0.0013 SI are thought to be caused by high basement in the form of volcanic rocks, while low anomalies obtained density values ranging from 2.45 - 2.49 gr/cm3 and susceptibility ranging from 0.0008 - 0.00085 SI are thought to be caused by thick sedimentary layers of the Batimafudi Formation.

Keywords


fold thrust belt, Geomagnetic, Gravity, Joint Inversion, Tanimbar

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References


H. A. Saputro, “Analisis Produksi Minyak Mentah Indonesia Dengan Pendekatan Error Correction Model,” Econ. Dev. Anal. J., vol. 3, no. 1, pp. 36–47, 2014, [Online]. Available: http://journal.unnes.ac.id/sju/index.php/edaj

L. Lamba, I. Haryanto, D. S. Herutomo, N. Ilmi, and E. Sunardi, “Geologi Bawah Permukaan Dan Perhitungan Cadangan Hidrokarbon Dengan Metode Volumetrik Berdasarkan Interpretasi Data Seismik 2D Daerah Cekungan Tanimbar,” Padjadjaran Geosci. J., vol. 5, no. 4, pp. 394–404, 2021.

Koesnama and A. K. Permana, “Sistem Minyak Dan Gas Di Cekungan Timor, Nusa Tenggara Timur Petroleum System In The Timor Basin, Nusa Tenggara Timur,” J.G.S.M, vol. 16, no. 1, pp. 23–32, 2015, [Online]. Available: https://jgsm.geologi.esdm.go.id/index.php/JGSM/article/view/48

M. G. Audley-Charles, “Geometrical problems and implications of large scale over-thrusting in the Banda Arc-Australian margin collision zone,” Geol. Soc. London, Spec. Publ., vol. 9, no. 1, pp. 407–416, 1981.

N. R. Amelia, Supriyanto, and H. Haryanto, “Identifikasi Stuktur Geologi Sebagai Potensi Area Jebakan Hidrokarbon Berdasarkan Integrasi Data Gaya Berat dan Data Seismik di Pulau Timor , Indonesia Timur,” Geosains Terap., vol. 4, no. 1, pp. 1–8, 2021.

T. R. Charlton, T. R. Charlton, and S. Omer, “The petroleum potential of inversion anticlines in the Banda Arc,” vol. 5, no. 5, pp. 565–585, 2004, doi: 10.1306/12290303055.

J. Poblet and R. J. Lisle, “Kinematic evolution and structural styles of fold-and-thrust belts,” Geol. Soc. Spec. Publ., vol. 349, pp. 1–24, 2011, doi: 10.1144/SP349.1.

T. Niluh, “Integrasi Metode Gayaberat Dan Data Seismik Untuk Mengidentifikasi Struktur Perangkap,” 2021.

R. Zhang, T. Li, C. Liu, X. Huang, K. Jensen, and M. Sommer, “3-D joint inversion of gravity and magnetic data using data-space and truncated Gauss–Newton methods,” IEEE Geosci. Remote Sens. Lett., vol. 19, pp. 1–5, 2021.

L. A. Gallardo, “Cross-Gradients Joint Inversion of Disparate Geophysical Data for Improved Subsurface Characterisation : Multiple-Physics Field Examples,” Philosophy, pp. 1–7.

L. Gross, “Weighted cross-gradient function for joint inversion with the application to regional 3-D gravity and magnetic anomalies,” Geophys. J. Int., vol. 217, no. 3, pp. 2035–2046, 2019, doi: 10.1093/gji/ggz134.

M. Tavakoli, A. Nejati Kalateh, and M. Rezaie, “Two-Dimensional Cross-Gradient Joint Inversion of Gravity and Magnetic Data By a Sequential Strategy,” 82nd EAGE Conf. Exhib. 2021, vol. 2, no. November, pp. 1112–1116, 2021, doi: 10.3997/2214-4609.202010967.

M. Syukri, Pengantar Geofisika. Syiah Kuala University Press, 2020.

S. H. Muchtar, “Penerapan Metode Geomagnetik Untuk Identifikasi Sebaran Batubara Daerah Klatak Kecamatan Besuki Kabupaten Tulungagung,” Universitas Islam Negeri Maulana Malik Ibrahim, 2018.

J. Purnomo, S. Koesuma, and M. Yunianto, “Pemisahan Anomali Regional-Residual pada Metode Gravitasi Menggunakan Metode Moving Average, Polynomial dan Inversion,” Indones. J. Appl. Phys., vol. 3, no. 01, p. 10, 2013, doi: 10.13057/ijap.v3i01.1208.

J. D. Phillips, Geosoft eXecutables (GX’s) developed by the US Geological Survey, version 2.0, with notes on GX development from Fortran code. US Geological Survey, 2007.

Supriyanto, Analisis Data Geofisika: Memahami Teori Inversi. 2007.

W. J. Hinze, R. R. B. Von Frese, R. Von Frese, and A. H. Saad, Gravity and magnetic exploration: Principles, practices, and applications. Cambridge University Press, 2013.

U. Permana, “Pengolahan Data Seismlk Refleksi 2d Untuk Memetakan Struktur Bawah Permukaan Lapangan X Prabumulihsumatra Selatan,” ALHAZEN J. Phys., vol. 2, no. 1, 2015.

A. Syafnur and T. A. Sunantyo, “Potensi Airborne Gravity untuk Studi Sesar,” Pros. Semin. Nas. Geotik, pp. 392–399, 2019.




DOI: https://doi.org/10.15408/fiziya.v6iI.34293 Abstract - 0 PDF - 0

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