Residual characteristics of Carboniferous-Permian in southwestern Bohai Sea and its hydrocarbon-generating material base

  • Keliang LI , 1 ,
  • Jianqiang WANG , 1 ,
  • Wenhui LIU 1 ,
  • Rongtao CHEN 2 ,
  • Lixin PEI 1 ,
  • Xiaoyan CHEN 1 ,
  • Hui DENG 2 ,
  • Heng PENG 1
Expand
  • 1. State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an 710069,China
  • 2. Tianjin Branch of China National Offshore Oil Corporation Limited,Tianjin 300459,China

Received date: 2021-12-26

  Revised date: 2022-02-08

  Online published: 2022-07-12

Supported by

The Major Scientific Research Project of Tianjin Branch of CNOOC(CCL2020 TJX0NST1278)

the National Natural Science Foundation of China(41972153)

Highlights

The Carboniferous-Permian of the Upper Paleozoic in the southwestern Bohai Sea, which is less explored, is used as the main object of study. Drilling wells and high-precision 3D seismic data were used to determine the characteristics of residual strata of the Carboniferous-Permian in the area and to explore the hydrocarbon-generating material base, combined with the development characteristics of the source rocks in the region. It is concluded that the Carboniferous-Permian in the southwestern Bohai Sea is mainly distributed in the Qinan Fault Step Belt, the Chengbei Depression, the Chengbei Low Uplift and the eastern slope. The maximum thickness of residual strata of the Carboniferous-Permian exceeds 1 200 m. And most of them are concentrated in 200-800 m,with the spreading characteristics of southwest-thickness and north-east-thinness. Besides, it is gradually thinned or even missing from the uplift and slope to the depression. The residual characteristics of Carboniferous-Permian are obviously influenced by Mesozoic and Cenozoic tectonic activities. Comparing the thickness of Carboniferous-Permian and the development characteristics of coal-derived hydrocarbon rocks in the Bohai Bay, it is concluded that the southwestern Bohai Sea has a good hydrocarbon material base, with coal rocks generally ranging from 10-40 m and coal measure mudstones generally ranging from 60-240 m. It has a good comparability with the Dagang exploration area with a higher degree of exploration.

Cite this article

Keliang LI , Jianqiang WANG , Wenhui LIU , Rongtao CHEN , Lixin PEI , Xiaoyan CHEN , Hui DENG , Heng PENG . Residual characteristics of Carboniferous-Permian in southwestern Bohai Sea and its hydrocarbon-generating material base[J]. Natural Gas Geoscience, 2022 , 33(7) : 1091 -1101 . DOI: 10.11764/j.issn.1672-1926.2022.03.011

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