Journal of Jilin University(Earth Science Edition) ›› 2020, Vol. 50 ›› Issue (1): 1-17.doi: 10.13278/j.cnki.jjuese.20180320

   

Development and Influencing Factors of Source Rock in Sequential Stratigraphic Framework in the Eastern Sub-Basin, North Yellow Sea

Liu Jinping1, Wang Gaiyun1, Jian Xiaoling1, Wang Liaoliang1, Du Min1, Cheng Gu2   

  1. 1. Key Laboratory of Marine Mineral Resources, Ministly of Natural Resources/Guangzhou Marine Geological Survey, Guangzhou 510075, China;
    2. Guangdong Key Laboratory of Geological Process and Mineral Resources Exploration/School of Earth Sciences and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
  • Received:2018-12-05 Published:2020-02-11
  • Supported by:
    Supported by National Natural Science Foundation of China(41302100) and Project of China Geological Survey(DD20191009,DD20190582-2)

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Abstract: The eastern sub-basin of the North Yellow Sea is an area with low degree of exploration, in which the Middle and Upper Jurassic dark mudstone is the main source rocks. The detailed evaluation of source rocks is very important for further exploration. Based on the sequence stratigraphy, by use the methods of organic geochemistry and organic petrology, the integrated study was conducted for the geochemical characteristics of the Jurassic source rocks in different sequences and different system tracts of the same sequence, and then the distribution law and main influencing factors of source rocks were discussed. The Middle and Upper Jurassic source rocks have high heterogeneity in the eastern sub-basin. The lithology of the source rocks is mainly dark mudstones of semi-deep lacustrine, deep lacustrine, and shore-shallow lacustrine in J2SQ1 and J2SQ2. Though these source rocks have high w(TOC), low w(S1+S2) and IH,and the type of organic matter is poor, so these source rocks don't have high hydrocarbon generation potential in this basin. In general, the quality of the Middle Jurassic source rocks is medium to poor. The lithology of source rocks is mainly dark mudstones of delta front and shore-shallow lacustrine in J3SQ1. The source rocks of J3SQ1 have low w(TOC), and all of them are poor source rocks in different system tracts. The lithology of source rocks is mainly dark mudstone of semi-deep lacustrine, deep lacustrine in J3SQ2, which is characterized by large thickness, high purity, and wide horizontal distribution. The w(TOC) of source rocks ranges from 0.5% to 5.3% in various system tracts of J3SQ2. The high-quality source rocks are mainly developed in the high stand system tracts and extent system tracts, which are the most important oil source rocks in the eastern sub-basin. The studies indicate that the range of distribution is controlled by the sequential stratigraphic framework and the sedimentary facies. The quality of source rocks is controlled by the terrestrial matter input and the primary organic matter production of the lake basin. The preservation of organic matter is controlled by the oxygen content and salinity of lake water to a certain degree. In conclusion, the eastern sub-basin of the North Yellow Sea is an oil and gas bearing basin with medium-low abundance. The favorable exploration targets should be found in the high-quality hydrocarbon source rocks.

Key words: sequential stratigraphy, source rock, influencing factors, Eastern sub-basin, North Yellow Sea

CLC Number: 

  • P618.13
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