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Organic geochemical,petrographic and palynological characterization of claystones of the Palaeogene Toraja Formation,and oil seeps in the Enrekang Sub-basin,south Sulawesi,Indonesia:Implications for hydrocarbon source rock potential

引用

Energy Geoscience 2024年第3期5卷 117-134页

作者： agus Ardianto Budiman Komang Anggayana agus haris widayat Dwiwahju Sasongko Rakhmat Fakhruddin Research Group of Earth Resources Exploration Faculty of Mining and Petroleum EngineeringInstitut Teknologi BandungJln.Ganesha 10Bandung40132Indonesia Department of Mining Engineering Faculty of Industrial TechnologyUniversitas Muslim IndonesiaJl.Urip Sumohardjo Km 05MakassarSulawesi Selatan90231Indonesia Department of Chemical Engineering Faculty of Industrial TechnologyInstitut Teknologi BandungJln.Ganesha 10Bandung40132Indonesia Research Center for Geological Resources National Research and Innovation AgencyJl.CisituSangkuriang BandungJawa Barat40135Indonesia

An organic geochemical,petrographical,and palynological evaluation was conducted on 30 claystone outcrop samples of the Toraja Formation,along with a geochemical analysis of an oil seep in the Enrekang *** aim of the study was to determine the correlation between oil and source rock in terms of age,depositional environment,organic material sources,and maturity *** total organic carbon content of the claystone samples varies from 0.03 to 4.52 wt%,which are classified as poor to *** claystones are immature to post-mature with a mixture of TypeⅡandⅢ*** vitrinite reflectance values range from 0.47 to 4.52%*** samples of Toraja Formation rock and the oil seep source rock might have a similar depositional environment,a deltaic marine depositional setting with high oxidizing *** material sources for rock and oil samples are dominated by terrestrial *** oil is inferred to have originated from the Paleogene source rocks,which correlates in age with the Toraja *** recovered palynomorphs from the studied rock samples suggest a late Eocene to Oligocene age with a strong terrestrial influence of shallow marine depositional *** biomarker analysis shows that the rock samples have a more substantial contribution from the terrigenous higher plants,while the oil sample indicates a higher degree of marine *** maturity levels are also different between the oil(peak mature)and the analyzed rock samples(immature).It is inferred that the oil seep source rock is equivalent to the analyzed rock sample but more mature,having been deposited under more marine *** oil seep source rock is not exposed and is located in the deeper part of the basin.A deeper marine facies(*** delta front and prodelta facies)in front of the distributary mouth bar within a delta is interpreted as the source rock of the oil seep sample.

关键词： Organic geochemistry Petrography Palynology Toraja Formation Enrekang Sub-basin

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