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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
M.H. Hermiyanto Zajuli
Geological Survey Institute, Geological Agency, Jln. Diponegoro 57 Bandung - 40122
Earth & Planetary Sciences Education Energy Engineering Environmental Science

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Organic Geochemistry and Rock-Eval Pyrolysis of Eocene fine Sediments, East Ketungau Basin, West Kalimantan Zajuli, M.H. Hermiyanto; Suyono, Suyono
Indonesian Journal on Geoscience Vol 6, No 2 (2011)
Publisher : Geological Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1816.031 KB) | DOI: 10.17014/ijog.v6i2.119

Abstract

DOI: 10.17014/ijog.v6i2.119Indonesia contains many Paleogene and Neogene basins which some of them have been proven to be a very prolific producer of oil and gas. A study on the result of Rock-Eval pyrolysis and biomarker undertaken on the Eocene Mandai Group was able to assess hydrocarbon potential of the Paleogene fine sediments in the frontier basin, especially West Kalimantan area. East Ketungau Basin is located in the western Kalimantan, bounded with Melawi Basin by the Semitau High in the south and West Ketungau Basin in the west. The Mandai Group was deposited in the East Ketungau Basin during Eocene, consisting of sandstone and mudstone facies. Mudstone facies comprises shale, claystone, and coal. Seven samples of Eocene fine sediments collected from East Ketungau Basin were analyzed by Rock-Eval pyrolisis and three samples for biomarker to evaluate their hydrocarbon potential. The Rock-Eval pyrolisis result of Mandai Group shows that TOC value of this facies ranges from 0.34 % to 5.16 %, Potential Yield (PY) between 0.06 and 4.78 mg HC/g rock, and Hydrogen Index (HI) from 12 to 89. Based on that result, the fine sediments of Mandai Group are included into a gas prone source rock potential with poor to fair categories. Moreover Tmax values vary from 426o C to 451o C. The Eocene fine sediments of Mandai Group fall under kerogen type III. Based on Tmax and biomarker analyses, the maturity of the sediments is situated within immature to mature level. The fine sediments of Mandai Group were deposited in a terrestrial to marine environment under anoxic to sub-oxic condition.
BATUAN SEDIMEN HALUS KELOMPOK MANDAI BERDASARKAN ANALISIS SCANNING ELECTRON MICROSCOPE (SEM) Zajuli, M.H. Hermiyanto
Jurnal Geologi dan Sumberdaya Mineral Vol 23, No 3 (2013): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

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Abstract

The eastern part of the Ketungau basin that is generally known us the Mandai sub-basin is a sedimentary basin that had been formed since early Tertiary. Fine-grained sedimentary rocks taken from the Mandai Group comprising four samples of mudstone and three samples of siltstone. Based on Scanning Electron Microscope analysis seven samples fine sediment of the Mandai group consist of illite (K1-1.5Al4(Si7-6.5Al1-1.5O20)(OH)4, smectite (1/2Ca)0.7(Al,Mg,Fe)4(Si,Al)8O20)nH2O and kaolinite (Al4(Si4O10)(OH)8. Other minerals are silica or fine-grained quarzt, feldspar, and algae (botryococcus). Diagenesis processes show that fine sediment of the Mandai group have undergone a diagenetic process within an mesodiagenetic level. Fine sediments have been buried at more than 2500 - 4000 m depth by temperature varying from 80° to 120°C.Key words : Ketungau Basin, SEM, diagenesis, siltstone, mudstone
The Mesozoic Hydrocarbon Source Rock Potential of Singkawang Basin, West Kalimantan Suyono, Suyono; Zajuli, M.H. Hermiyanto
Jurnal Geologi dan Sumberdaya Mineral Vol 19, No 3 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

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Abstract

The Singkawang Basin is one of  Mesozoic Basins in Western Indonesia that located in West Kalimantan. The Mesozoic Singkawang Basin is expected to have potential resources for conventional as well as non-conventional hydrocarbons. Several new concepts of oil and gas exploration may be defined in this basin including volcanic, basement fracture and Mesozoic sedimentary reservoirs.  The Singkawang Basin is a basin filled with sedimentary rocks that may have hydrocarbon potential  This basin has not been many studied by previous researchers. The aim of this research is to determine the potential of fine grained sedimentary rocks in the Singkawang Basin as the source rock of hydrocarbons. The TOC and Rock-Eval Pyrolysis (REP) analysis results from 69 fine-grained sedimentary rock samples concluded that the Sungaibetung Formation has a rich organic material ranging from 0.95 – 2.84%, while the Banan Formation ranges from 0.42 – 2.41%, the Pedawan Formation ranges from 0.27-2.29%, and the Kayan Formation ranges from 0.41 – 1.82%. The hydrogen index (HI) value of < 150 mg HC/g TOC and S2/S3 ratio value of < 3 indicates that some fine-grained sedimentary rocks of the Mesozoic Singkawang Basin have a tendency as a dry gas producer kerogen type and classified as a lean organic matter. The sedimentary rocks of the Singkawang Basin can be interpreted as gas source rocks that have entered an over mature stage. The Triassic to Oligocene fine -grained sedimentary rock indicates a good organic material. Moreover, the Sungaibetung Formation consists of very good organic material and tend to indicate hydrocarbons source rocks potential.Keywords: Mesozoic, source rocks, hydrocarbons, West Kalimantan
Co-Authors Suyono Suyono