Integrated Magnetotelluric (MT), Gravity and Seismic Study of Lower Kutai Basin Configuration

Irawati, Selvi Misnia; Wang, Li; Wijanarko, Edy; Grandis, Hendra

doi:10.5614/j.eng.technol.sci.2022.54.1.3

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Nevertheless, from the remaining period range valid for 2D modeling, i.e., 0.0001 to 100 sec., we expect that the MT data would be beneficial in obtaining overall subsurface resistivity structure of the area at a regional or subregional scale as was proven in another similar case with less dense MT stations distribution (e.g. Irawati et al, 2022). Rose diagrams and skew angle β for MT stations at lines AA', BB', and CC' are summarized in Fig.…”

Section: Resultsmentioning

confidence: 80%

Magnetotellurics study of Atambua area, West Timor, Indonesia

Wijanarko

Arisbaya

Sumintadireja

et al. 2022

Vietnam J. Earth Sci.

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Timor Island, located in the eastern Indonesian archipelago, has a complex tectonic evolution causing complex geological structures. Many hypothetical tectonic models are proposed mainly based on regional geological and geophysical data. Available geophysical data to support geological study at a more detailed scale are still very limited. Therefore, this study aimed to map the sub-regional subsurface geology in Atambua, West Timor, and its surroundings by using the magnetotelluric (MT) method. The estimated geo-electrical strike direction from the phase tensor analysis confirmed the regional Southwest - Northeast general structural orientation. The dimensionality analysis also showed the validity for 2D approximation in that direction. The subsurface resistivity models from 2D inversion of the MT data at representative lines perpendicular to the regional structural direction delineate the primary sequences and their boundaries from their resistivities. They are, from top to bottom, Viqueque and Bobonaro sequences, Kolbano sequence, Kekneno sequence, and the basement dominated by rocks with Australian affinity. These main rock formations represent the regional sedimentary depositional fill resulting from the major tectonic events on Timor Island.

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Section: Resultsmentioning

confidence: 80%

Magnetotellurics study of Atambua area, West Timor, Indonesia

Wijanarko

Arisbaya

Sumintadireja

et al. 2022

Vietnam J. Earth Sci.

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“…The anticlinorium folds are strong, asymmetrical, and have syncline boundaries. This syncline contains Miocene siliciclastic sediments [16]. Kutai Basin Statigraphy shown in Figure 1.…”

Section: Regional Geologymentioning

confidence: 99%

Analysis of two-dimensional magnetotelluric inversion for the delineation of the petroleum system in the Kutai basin, East Kalimantan, Indonesia

Muttakhin,

Hamidah,

Hapsoro

et al. 2024

J. Phys.: Conf. Ser.

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The Kutai Basin in East Kalimantan is known as a potential area for oil and gas exploration. Two-dimensional magnetotelluric (MT) analysis is applied to investigate the geological structure and distribution of subsurface resistivity. This study aims to delineate the petroleum system using MT data and identify zones with potential for the accumulation of hydrocarbons. MT data has been collected at several strategic locations in the Kutai Basin, and two-dimensional cross-sections have been constructed to obtain vertical resistivity imaging at several depths. In this study, there were nine measurement points located on one line. The data is then inverted to obtain a two-dimensional resistivity model, which qualitatively represents the subsurface structure. The results of this study indicate that there is a low resistivity anomaly zone that identifies the presence of source rock with a resistivity value of 1-12 Ωm. In this line, it is suspected that the petroleum system that allows trapped hydrocarbons is found in the area, below the KT36 and KT13 measurement points. In this area there are folded structures in the form of synclines and anticlines, which raises suspicions about the types of traps formed from structural traps.

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“…Exploration and production in several countries in Southeast Asia, such as Indonesia, Malaysia, and Thailand, has substantial quantities of shale gas and strong possibilities for it [5]. One of the prospective hydrocarbon producers in Indonesia is located in the Kutai Basin, East Kalimantan [6], [7]. The stratigraphy of the Kutai Basin consists of four main formations, namely the Pamaluan, Pulaubalang, Balikpapan, and Kampung Baru formations, with the Pamaluan Formation showing maturity achievements with mature to over-mature categories based on maturity analysis through rock-eval and pyrolysis [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Identification of shale gas existence based on 2-dimensional magnetotelluric data in the Kutai basin, East Kalimantan, Indonesia

Putri,

Hawan,

Hapsoro

et al. 2024

J. Phys.: Conf. Ser.

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Research on unconventional methods in the shale gas exploration process has begun to be developed to meet the demand for oil and natural gas sustainability. The research area is located in the Kutai Basin, East Kalimantan, Indonesia. The current study from the Geological Survey Center shows that the Kutai Basin has 46.79 TCF of shale gas potential. The magnetotelluric (MT) method was applied in this study to describe the distribution of subsurface resistivity values. The inversion schemes performed in the MT method are 1-dimensional and 2-dimensional inversions. In this study, there are 8 measurement stations in one line. The presence of low resistivity values or conductive zones identifies the potential for black shale layers. The potential for shale gas is suspected to be detected at station KT29, which is included in the Pamaluan Formation, and at stations KT12, KT31, KT13, and KT15, which are included in the Pulaubalang Formation, because it is associated with source rock from petroleum in the Kutai Basin system, as supported by previous research data.

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Integrated Magnetotelluric (MT), Gravity and Seismic Study of Lower Kutai Basin Configuration

Cited by 3 publications

References 11 publications

Magnetotellurics study of Atambua area, West Timor, Indonesia

Magnetotellurics study of Atambua area, West Timor, Indonesia

Analysis of two-dimensional magnetotelluric inversion for the delineation of the petroleum system in the Kutai basin, East Kalimantan, Indonesia

Identification of shale gas existence based on 2-dimensional magnetotelluric data in the Kutai basin, East Kalimantan, Indonesia

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