ZHOU Jiawei, ZHANG Li, LEI Zhenyu, YAN Wei, LUO Shuaibing, QIAN Xing. Characteristics of stratigraphic sequence and the source-reservoir-cap assemblages in the Nanweixi petroliferous basin[J]. Marine Geology & Quaternary Geology, 2021, 41(6): 163-173. DOI: 10.16562/j.cnki.0256-1492.2021051201
Citation: ZHOU Jiawei, ZHANG Li, LEI Zhenyu, YAN Wei, LUO Shuaibing, QIAN Xing. Characteristics of stratigraphic sequence and the source-reservoir-cap assemblages in the Nanweixi petroliferous basin[J]. Marine Geology & Quaternary Geology, 2021, 41(6): 163-173. DOI: 10.16562/j.cnki.0256-1492.2021051201
shu

Characteristics of stratigraphic sequence and the source-reservoir-cap assemblages in the Nanweixi petroliferous basin

  • 1.

    Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou 510760, China

  • 2.

    Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou 510760, China

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  • Received Date: May 11, 2021
  • Revised Date: July 18, 2021
  • Available Online: December 19, 2021
    Graphical Abstract
    • Abstract
  • Based on the 2D multi-channel seismic data from the Guangzhou Marine Geological Survey and the drilling data collected from foreign companies, we studied in this paper the regional geological evolutionary process of the Nanweixi basin and its influence on the development of basin strata. By referring to the stratigraphic sequence frameworks of adjacent basins, cross basin seismic lines are used as tools for stratigraphic correlation. the stratigraphic sequence and chronology of the Nanweixi basin are established then, and the characteristics of source-reservoir-cap assemblage and their petroleum geological significance are analyzed. A total of seven unconformities(T1, T2, T3, T31, T4, T5, Tg)are identified, which can be traced in the basin and used to divide the strata into seven sequences. Excluding the T1 unconformity, they correspond to important Cenozoic geological events of Guangya movement, Wan, an movement, Nansha movement, Nanhai movement, Xiwei movement, Liyue movement in descending order. The basement of the basin is late Cretaceous in age, as same as that of the surrounding basins. And it is speculated that igneous rocks dominated by granite and metamorphic rocks are well developed. As the most significant unconformity in the basin, the T3 unconformity is aged 10.4 Ma, corresponding to the Wan'an movement. Three types of source-reservoir-cap assemblages have formed since Eocene. In Miocene, carbonate strata are developed in the basin, and may become a high-quality reservoir. There are excellent source-reservoir-cap assemblages in the basin which may suggest a promising oil and gas prospect.
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