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All Journal Journal of Geoscience, Engineering, Environment, and Technology Petro : Jurnal Ilmiah Teknik Perminyakan
Siregar, Yusmansyah
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Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Physics

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Characteristic of the Source Rock Of The Lahat and Talang Akar With Crude Oil In Sarolangun, Jambi sub-basin, Indonesia Alfayed, Muhammad Rus Dody; Siregar, Yusmansyah; Ramadani, Dinda Novia; Syaifudin, M.; Setiawan, Jatmika
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 4 (2025): JGEET Vol 10 No 04 : December (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.4.17999

Abstract

The research location is situated in Sarolangun, Jambi Province, within the Jambi Sub-Basin. Oil has been produced in the Jambi Sub-Basin study area from Paleogene-Neogene aged source rocks. However, the success ratio of oil discovery in the Jambi Sub-Basin remains at 51%. This study aims to determine the geochemical aspects in characterizing the source rocks and oil. The data used for analysis include total organic carbon, rock pyrolysis, vitrinite reflectance, and biomarkers.Geochemical characterization of the Lahat Formation source rock reveals a kerogen type II-III, generating oil and gas, while the Talang Akar Formation has a kerogen type II, producing oil, and the upper part of the Talang Akar Formation also has a kerogen type II, generating oil. The Lahat Formation biomarker consists of higher plants and algae in anoxic conditions, with high C29 sterane and early mature Tm/Ts ratio. The lower part of the Talang Akar Formation biomarker has lacustrine-marine algae organic material in anoxic conditions, with high C27 sterane and early mature Tm/Ts ratio. The upper part of the Talang Akar Formation biomarker has higher plant and marine algae organic material, with high oleanane and early mature Tm/Ts ratio. The produced oil has biomarker characteristics indicating deposition in anoxic conditions, with a mix of algae-higher plant organic material, and early mature Tm/Ts ratio. Based on these results, the oil is positively correlated with the Talang Akar Formation, indicating that the organic material originates from a marine or lacustrine depositional environment.
EVALUASI BATUAN INDUK FORMASI TALANG AKAR ATAS BERDASARKAN DATA GEOKIMIA DI DESA BUKIT SUBAN, KABUPATEN SAROLANGUN, SUB-CEKUNGAN JAMBI Alfayed, Muhammad Rus Dody; Riyadi, Hasan; Zelandi, Muhammad; Siregar, Yusmansyah; Syaifudin, M.
Petro : Jurnal Ilmiah Teknik Perminyakan Vol. 14 No. 4 (2025): Desember 2025
Publisher : Jurusan Teknik Perminyakan Fakultas Teknologi Kebumian dan Energi Universitas Trisakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/petro.v14i4.24537

Abstract

Our oil and gas exploration must be able to understand the concept of the petroleum system. Source rock is one of the most important parameters in the petroleum system that functions as a hydrocarbon producer or source rock, even placing the bedrock as the number one priority that must be present in the petroleum system (Magoon and Dow, 1994). This study aims to determine the potential of parent rocks in the Upper Talang Akar Formation in the research area to produce hydrocarbons. The research method was carried out using surface samples, geochemical analysis of Total Organic Carbon, Rock-Eval Pyrolysis and Vitrinite Reflektance. Based on the results of geochemical analysis research that has been carried out on the source rock of the Upper Talang Akar Formation, the characteristics of the potential of the source rock in producing hydrocarbons have a rich organic material range (1.38 – 4.06), based on TOC data, the sample of the source rock of the Upper Talang Akar Formation has quite good potential. Analysis of organic material types in the study area's source rock samples yielded kerogen types II and III that have the potential to produce oil and gas hydrocarbons. The maturity level analysis is based on Tmax data of the Upper Talang Akar Formation source rock has an immature maturity level and based on Ro data, the upper Talang Akar of the source rock has an immature maturity level. Therefore, it can be concluded that the shale source rock of the Upper Talang Akar Formation in the research area has the potential to produce good to very good hydrocarbons and produce oil and natural gas in the immature phase.
Co-Authors Alfayed, Muhammad Rus Dody Jatmika Setiawan, Jatmika M. Syaifudin Muhammad Zelandi Ramadani, Dinda Novia Riyadi, Hasan