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Volume 44 Issue 6
Nov.  2022
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2022  >  44(6): 1116-1122
PENG Guangrong, LONG Zulie, SHI Yuling, SHI Chuang, YANG Xingye, LIU Ling, MA Xiaonan. Discussion on integrated geological and geophysical identification method for spatial distribution of favorable source rocks in depression with lack of drilling data: a case study of Enping 17 Sag, Zhu Ⅰ Depression, Pearl River Mouth Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(6): 1116-1122. doi: 10.11781/sysydz2022061116
Citation: PENG Guangrong, LONG Zulie, SHI Yuling, SHI Chuang, YANG Xingye, LIU Ling, MA Xiaonan. Discussion on integrated geological and geophysical identification method for spatial distribution of favorable source rocks in depression with lack of drilling data: a case study of Enping 17 Sag, Zhu Ⅰ Depression, Pearl River Mouth Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(6): 1116-1122. doi: 10.11781/sysydz2022061116
shu

Discussion on integrated geological and geophysical identification method for spatial distribution of favorable source rocks in depression with lack of drilling data: a case study of Enping 17 Sag, Zhu Ⅰ Depression, Pearl River Mouth Basin

doi: 10.11781/sysydz2022061116
  • 1.

    Shenzhen Branch of CNOOC (China) Co., Ltd., Shenzhen, Guangdong 518054, China

  • 2.

    CNOOC Deepwater Development Limited, Shenzhen, Guangdong 518054, China

  • Received Date: 2022-05-25
  • Rev Recd Date: 2022-09-26
  • Publish Date: 2022-11-28
    Abstract
  • Due to the lack of drilling data in the Zhu 1 Depression of the Pear River Mouth Basin, the Enping 17 Sag is taken as an example in this paper to solve the problem of comprehensive identification of underground distribution of high-quality source rocks. Based on the analysis of the geological background, sedimentary characteristics and petrophysical characteristics of source rocks, seismic inversion is guided by the constraints of the petrophysical characteristics of the source rocks in different sedimentary environments. According to the statistics of the relationship between the lithofacies of drilled source rocks and the inversion resistance, a semi-quantitative prediction of the spatial distribution of favorable source rocks is made by geological modeling, and the rationality of prediction method and results is analyzed in combination with the recognition of the geochemical origin type and source of crude oil, to discuss the geological and geophysical identification method of the underground distribution of high-quality source rocks with lack of drilling data. The more reductive the depositional environment of source rocks in the Paleogene Wenchang Formation, the lower the impedance value of high-quality source rocks, and the greater the impedance difference between poor source rocks or non-source rocks. The third, fourth and fifth members of Wenchang Formation are the main source rocks of the Enping 17 Sag, which can be supported by the study of crude oil biomarkers. In the small sags of the Pearl River Mouth Basin with basically clear petroleum geological background conditions, establishing the quantitative and semi-quantitative relationship between the lithofacies of source rocks and the inversion impedance value is helpful to quickly clarify the development interval and scale of main source rocks. This method has a good prospect of popularization and application.

     

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