Oil & Gas Geology ›› 1991, Vol. 12 ›› Issue (3): 251-260.doi: 10.11743/ogg19910302

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OIL-GENERATION ASSESSMENT AND OIL-SOURCE CORRELATION OF MIDDLE TRIASSIC IN BAISE BASIN

Fan Shanfa1, Zhou Zhongyi1, Pan Changchun1, Pei Chunmin1, Han Linlin1, Wu Dahua2, Dong Ping2, Chen Changxiu2   

  1. 1. Institute of Geochemistry, Chinese Academy of Science, Guangzhou;
    2. Research Institute of Petroleum Exploration and Development, Petroleum Exploration Bureau of Yunnan-Guizhou-Guangxi
  • Received:1990-02-15 Online:1991-09-25 Published:2012-01-16

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Abstract:

Middle Triassic marine sediments in the Baise Basin are characterised by stable carbon isotopic δ13C-value of -27.49-29.34‰, Pr/Ph less than 0.5 and the presence of garmmacerane, tricyclic terpanes, β-and γ-carotanes. Middle Triassic biomarker distribution reflects saline and strong reducing palaeoenvironment. The stable carbon isotopic δ13C-value and biomarker data indicate that Middle Triassic oils come from the source rocks of the Tertiary Nadu Formation. The Middle Triassic strata, having very low abundance of organic matter, belong to nonsource rocks and are inmature to condensate stages.