Initial Geochemical Assessment of Coaly Source Rocks in Sumatera, Java,and Kalimantan

https://doi.org/10.22146/jag.72588

Jasmin Jyalita(1*), Donatus Hendra A(2), Ferian Anggara(3)

(1) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta
(2) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta
(3) Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta
(*) Corresponding Author

Abstract


In Western Indonesia’s petroleum system, one of the hydrocarbon source rocks was deposited in parallic-deltaic environment with high organic content, categorizing it as coaly source rock. This study focused on geochemical characteristics of 25 coal and coaly shale samples from rock outcrops and well representing the Central Sumatra, South Sumatra, South Central Java, Barito, and Kutai Basin, with additional data from previous studies. TOC analysis and Rock-eval Pyrolysis were carried out to reveal the geochemical characteristics and maturation pathway of the source rock. The TOC analysis results showed a value of 0.5-67.73 wt%, indicating poor-excellent source rock potential. Further rock-eval pirolysis exhibits kerogen type II/II-III (excluding samples from Ngimbang Fm.), with gas-dominated hydrocarbon. Hydrocarbon Index ranging from 4-308 mg/gC indicates possible low-moderate quantity of hydrocarbon that can be generated by the source rocks. Despite the overall fair-good source rock potential, Tmax of the samples indicates a very poor maturity level, with only Upper Talang Akar as the mature candidate. Thus, it can be concluded that young source rock candidates in Western Indonesia (limited to the basins studied in this research) initially possess potential in generating hydrocarbons, if it is not for the immature level of most coaly source rock formations.

Keywords


Western Indonesia; Coaly Source Rock; Geochemical Characteristics; TOC; Rock-eval Pyrolysis

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References

Al-Areeq, N. M. (2018). Petroleum Source Rocks Characterization and Hydrocarbon Generation. Intech Open Recent Insights in Petroleum Science and Engineering.

Amijaya, H., Adibah, N., & Ansory, A. Z. A. (2016). Lithofacies and Sedimentation of Organic Matterin Fine Grained Rocks of Nanggulan Formation in Kulon Progo, Yogyakarta. Journal of Applied Geol ogy, vol. 1(2): 82-88.

Azizah, S. G. N., Haris, A., & Julikah. (2019). Evaluation of Shale Hydrocarbon Potential in UpperTalang Akar Formation based on Laboratory Geo-chemical Data Analysis and Total Organic Carbon (TOC) Modelling. Life and Environmental Sciences Academics Forum 2019: 1-8.

Bissada, K. K., & Peters, K. E. (1991). Exploration Geo chemistry Seminar. Indonesia Petroleum Association.

Doust, H., Noble, & R. A. (2007). Petroleum systems of Indonesia.Marine and Petroleum Geology 25 (2): 103-129.

Hui, S. S., Pang, X. Q., Jiang, F. J., Wang, C. X., Mei, S. X., Hu, T., Pang, H., Li, M., Zhou, X. L., & Shi,K. Y. (2023). Quantitative Effect of Kerogen Type on the Hydrocarbon Generation Potential of Paleogene Lacustrine Source Rocks, Liaohe Western Depression, China. Petroleum Science.

Napitupulu, H., & Sosrowidjojo, I. B. (2002). The Warukin Formation: An Alternative Source Rock in the Barito Basin. The 31st Annual Convention of Indonesian Association of Geologists: 138-155.

Permana, A. K., Sendjadja, Y. A., Panggabean, H., & Fauzely, L. (2018). Depositional Environment and Source Rocks Potential of the Miocene OrganicRich Sediments, Balikpapan Formation, East Kutai Sub Basin, Kalimantan. Jurnal Geologi dan Sumberdaya Mineral 19 (3): 171-186.

Peters, K. E., & Cassa, M. R. (1994). Applied Source Rock Geochemistry. The Petroleum System-From Source to Trap. AAPG Memoir 60: 93-120.

Sykes, R., & Snowdon, L. R. (2002). Guidelines for Assessing the Petroleum Potential of Coaly Source Rocks using Rock-Eval Pyrolysis. Organic Geochemistry 33: 1441-1455.

Tissot, B. P., & Welte, D. H. (1984). Petroleum Forma tion and Occurrence. 2nd ed: 699.

Waples, D. W. (1985) Geochemistry in Petroleum Exploration. Springer Netherlands: 232.

Wilkins, R. W. T., & George, S. C. (2002). Coal as asource rock for oil: a review. InternationalJournal of Coal Geology 50 (1–4): 317-361.

Winardi, S., Toha, B., Imron, M., & Amijaya, D.H. (2014) The Potential of Eocene Shale of Nanggu lan Formation as a Hydrocarbon Source Rock.Indonesian Journal on Geoscience8 (1): 13-23



DOI: https://doi.org/10.22146/jag.72588

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