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Organic geochemistry of the Lower Permian Tak Fa Formation in Phetchabun Province,Thailand:implications for its paleoenvironment and hydrocarbon generation potential

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Acta Geochimica 2020年第3期39卷 291-306页

作者： piyaphong chenrai Supawich Fuengfu Petroleum Geoscience Faculty of ScienceChulalongkorn UniversityBangkok 10330Thailand Basin Analysis and Structural Evolution Special Task Force for Activating Research(BASE STAR) Department of GeologyFaculty of ScienceChulalongkorn UniversityBangkok 10330Thailand

The outcrop samples of the Tak Fa Formation(Lower Permian)in Phetchabun Province have been studied to determine their organic geochemical characteristic,depositional paleoenvironment,and hydrocarbon generation *** total organic carbon(TOC)values ranging from 1.42 to 4.58 wt%and extractable organic matter values ranging from 76.84 to 197.65 ppm of the Tak Fa Formation were generally low and associated with low S2 values(0.00-0.50 mg HC/g rock)and hydrogen index values in range of 0-32 mg/g TOC,although this could reflect highly thermal maturity and complex tectonic ***,kerogen classification can be based on a nonbiomarker study for these outcrop samples *** non-biomarker plot,Pr/n-C17 and Ph/n-C18 from this study indicates that organic matter originally comes from typeⅡ/III *** samples were also investigated and indicated that the organic matter inputs were derived from mixed marine and terrigenous sources and deposited under suboxic to oxic *** depositional environment of the Tak Fa Formation in this study is interpreted to be an estuarine environment or restricted lagoonal carbonate *** has been achieved from normal alkane and isoprenoids distributions,terpane,and sterane ***,the Tak Fa Formation is considered to be a hydrocarbon source rock during the time of the *** the geochemical data in this study indicate that the Tak Fa Formation has experienced high maturation,one or more locations could meet a condition that places this formation to be an active source *** approach and concepts presented in this study can be applied to similar evaporite-carbonate deposits in Thailand to find more petroleum plays.

关键词： Biomarker Depositional environment Source inputs Tak Fa Formation Khao Khwang Platform

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