Keywords
Oligocene
organic petrography
biomarker
lacustrine
Muara Bungo
How to Cite
Abstract
The research area is situated in the northwestern side of South Sumatra Basin, which is a part of Muara Bungo Regency, Jambi Province. The Oligocene Sinamar Formation consists of shale, claystone, mudstone, sandstone, conglomeratic sandstone, and coal-seam intercalations. This research was focused on fine sedimentary rock of Sinamar Formation, such as shale, claystone, and mudstone. Primary data were collected from SNM boreholes which have depths varying from 75 m up to 200 m, and outcrops that were analyzed by organic petrographic method, gas chromatography-mass spectrometry (GC-MS) of normal alkanes including isoprenoids, and sterane. The dominant maceral group is exinite, composed of alginite (3.4 - 18%), and resinite (1.6 - 5.6%), while vitrinite maceral consists of tellocolinite 0.4 - 0.6%, desmocollinite 0.4%, and vitrodetrinite 8.4 - 16.6%. Organic petrography and biomarker analyses show that organic materials of shales were derived from high plants and algae especially Botrycoccus species. Botrycoccus and fresh water fish fossil, found in the shale indicate a lacustrine environment.
References
De Coster, G.L., 1974. The Geology of the Central and South Sumatra Basins. Proceedings of Indonesian Petroleum Assosiation 3th Annual Convention, p.77-110.
Pertamina, 1992. Geology Survey of Merlung, Jambi, Pertamina tidak diterbitkan.
Peters, E. and Moldowan, J., 1993. The biomarker guide: Interpreting molecular fossils in petroleum and ancient sediments, Englewood Cliffs, Prentice Hall, 363pp.
Rosidi, H.M.D., Tjokrosaputro S., Pendowo B., Gafoer S., and Suharsono, 1996. Peta Geologi Lembar Painan dan bagian Timurlaut Lembar Muarasiberut, Sumatra, sekala 1:250.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.
Setiadi, I. and Widijono, B.S. 2010. Delineasi Cekungan Sedimen Sumatra Selatan Berdasarkan Analisis Data Gayaberat. Jurnal Sumber Daya Geologi, 20 (2), p.20.
Silitonga, P.H. and Kastowo, 1995. Peta Geologi Lembar Solok skala 1:250.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.
Suwarna, N., Budhitrisna, T., Santosa, S., and Mangga S.A., 1994. Peta Geologi Lembar Rengat, skala 1:250.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.
Tissot, B.P. and Welte, D.H, 1984. Petroleum Formation and Occurrence; Second Revised and Enlarged Edition, Springer-Verlag Berlin Heidelberg, Berlin, 521pp.
Waples, D.W. and Machihara, 1991. Biomarkers for Geologist - A pracical guide for the application of steranes and triterpanes in petroleum geology. American Association of Petroleum Geologist. Methods in Exploration, 9, 91pp. doi:10.1017/S0016756800008529
Van Bemmelen, R.W., 1949. The Geology of Indonesia, Vol. 1A General Geology of Indonesia and Adjacent Archipelagoes. Government Printing Office, The Hague, Netherlands.