Organic geochemistry characteristics of the fine grained sedimentary rock of the second memberof Kongdian Formation（Ek2） in Cangdong Sag，Huanghua Depression，Bohai Bay Basin
Received date: 2017-12-12
Revised date: 2018-02-22
Online published: 2018-04-10
Shale oil exploration made great progress in the second member of Kongdian Formation in Cangdong Sag and several wells got industrial oil flow in the shale segment which was considered as hydrocarbon source rocks.However，the internal lithologic and organic geochemical features have not been studied in-depth.Based on the analysis of conventional thin section，whole rock X-ray diffraction，organic carbon，vitrinite reflectance，soluble organic components of rocks，saturated hydrocarbon chromatography and saturated hydrocarbon mass spectrometry，the lithology and organic geochemistry characteristics of the fine grained lithologic of the second member of Kongdian Formation in Cangdong Sag were systematically evaluated.The evaluation results of the second member of Kongdian Formation shows demonstrate complex rock mineral composition，high abundance of organic matter with Type Ⅱ1 and Type Ⅱ2 kerogen，and low-medium thermal maturity.Normal alkane extract from source rock contains single peak type and double peak type；source rock has phytane advantage and only few samples have low content of gammacerane，indicating strong reducing environments；C29sterane content is obviously higher than C27or C28 sterane，C27 sterane also has relatively strong peaks.The organic matter of the second member of Kongdian Formation in Cangdong Sag is mainly from the higher plant，and also has lower aquatic organisms and algaes.
Yang Fei，Pu Xiu-gang，Jiang Wen-ya，Han Wen-zhong，Zhang Wei，Shi Zhan-nan，Lin Chang-mei . Organic geochemistry characteristics of the fine grained sedimentary rock of the second memberof Kongdian Formation（Ek2） in Cangdong Sag，Huanghua Depression，Bohai Bay Basin[J]. Natural Gas Geoscience, 2018 , 29(4) : 550 -558 . DOI: 10.11764/j.issn.1672-1926.2018.03.006
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