Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (4): 1030-1046.doi: 10.13278/j.cnki.jjuese.201704106

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Characteristics of Sedimentary Facies and Source Rocks of Mesozoic-Paleozoic in Central Uplift of South Yellow Sea: A Case Study of CSDP-2 Coring Well

Cai Laixing1,2,3, Wang Jiao1,2,3, Guo Xingwei1,2, Xiao Guolin1,2,3, Zhu Xiaoqing1,2, Pang Yumao1,2   

  1. 1. Qingdao Institute of Marine Geology, Qingdao 266071, Shandong, China;
    2. Qingdao National Laboratory for Marine Science and Technology/Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao 266237, Shandong, China;
    3. Key Laboratory of Marine Petroleum Resources and Environment Geology, Ministry of Land and Resources, Qingdao 266071, China
  • Received:2016-12-07 Online:2017-07-26 Published:2017-07-26
  • Supported by:
    Supported by National Marine Geology Special Program of China(DD20160147);National Key Basic Research Program of China("973" Program)(2013CB429701)and National Natural Science Foundation of China (41210005)

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Abstract: Based on the cores and data of residual TOC, chloroform asphalt "A", Ro and hydrocarbon generating potential and other geochemical data of 38 source rock samples from the CSDP-2 overall coring well, this paper distinguished accurately the sedimentary facies and then analysed systematically the characteristics of abundance, maturity and types of organic matter in various formation of the Mesozoic-Paleozoic in the central uplift of the South Yellow Sea basin. Furthermore, combining with the research results of predecessors, we not only compared the differences of source rocks between the sea area with Jiangsu-Anhui area, which are both in the Lower Yangtze region, but also inquired into the oil & gas exploration prospect in the Mesozoic-Paleozoic of the South Yellow Sea basin. The results indicate that the South Yellow Sea had experienced 6 large-scale transgression and regression. Controlled by this mechanism, it developed shallow shelf, barrier coast, and delta depositional system and filled shallow inner shelf, rimmed carbonate platform, tidal flat lagoon and delta front and other continuous sedimentary evolution sequence in the region. The source rocks qualities of 4 sets in the sea basin, Qixia Formation, Longtan Formation, Dalong Formation and Qinglong Formation, are same as the source rocks in Jiangsu-Anhui area, which are all belong to medium-best source rock level. In vertical direction, the qualities of source rocks in Longtan and Dalong Formation are the best, where developed a large number of high-quality hydrocarbon source rocks. Besides, the source rocks in Qinglong Formation are lesser quality but also effective. Based on the above, the marine strata exists rich foundation of hydrocarbons, 7 high amplitude rise sections of gas and fluorescence logging and more than 40 oil & gas shows directly, which all show a great potential for oil & gas exploration in the Mesozoic-Paleozoic of the South Yellow Sea basin.

Key words: CSDP-2 overall coring well, types of sedimentary facies, characteristics of source rocks, Mesozoic and Paleozoic marine strata, South Yellow Sea basin

CLC Number: 

  • P736.2
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