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Irawati, Selvi Misnia
Geophysical Engineering, Institut Teknologi Sumatra (ITERA) Jalan Terusan Ryacudu, Lampung Selatan 35365, Indonesia
Humanities Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Physics Public Health

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Journal : Journal of Engineering and Technological Sciences

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Integrated Magnetotelluric (MT), Gravity and Seismic Study of Lower Kutai Basin Configuration Selvi Misnia Irawati; Hidayat Hidayat; Edy Wijanarko; Hendra Grandis
Journal of Engineering and Technological Sciences Vol. 54 No. 1 (2022)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2022.54.1.3

Abstract

This work describes a subsurface basin configuration of the Lower Kutai Basin (hereinafter LKB) in East Kalimantan, Indonesia, as inferred from combination of magnetotelluric (MT), seismic, and gravity data. LKB is structurally controlled mainly by the Samarinda Anticlinorium extending in a NNE-SSW direction and is one of the most prolific hydrocarbon basins in Indonesia. The phase tensor analysis of MT data from most stations and frequencies exhibited a 2D character with a relatively low skew (-3° < β < 3°).  The geo-electrical strike direction was estimated at N30°E, which is in good agreement with the regional geological strike with a NNE-SSW direction. 2D MT inversion modeling was performed to infer the subsurface resistivity distribution associated with LKB’s configuration. From the integration of MT, seismic and gravity models it was shown that LKB’s configuration is composed mainly of sandstone, black shale, claystone, and basement rocks. The conductive zones of the MT models are associated with thermal alteration of black shale, which changes its mineralization, leading to lower resistivity. Hence, the black shale may be interpreted as potential hydrocarbon source rock in LKB.
Co-Authors Adilla, Rifa Prima Agus Laesanpura Airlangga, Feby Alutsyah Luthfian Amin, Fadhlan amin Andika, Putu Pradnya Andri Yadi Paembonan Andri Yadi Paembonan Antosia, Risky Martin Asido Saputra Sigalingging Dahlila, Dea Dorlensa Sitorus Edy Wijanarko Farduwin, Alhada Fernanda, Leonardo Handoyo Handoyo Hendra Grandis Hidayat Hidayat Jaya, Muhammad Rendi Junian, Wahyu Eko Lita Maharani M. Strack, Kurt Maharani, Lita Mahendra, Merizki Ade Manurung, Sarah Merizki Ade Mahendra Nathania, Edlyn Yoadan Nugraha, Purwaditya Pahri, Pahri Purwaditya Nugraha Putri, Intan Andriani Santoso, Nono Agus Wibowo, Andy Setyo