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Volume 34 Issue 4
Aug 2023
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Wei Wu, Peng Cheng, Shenyang Liu, Chao Luo, Haifeng Gai, Haitao Gao, Qin Zhou, Tengfei Li, Kesu Zhong, Hui Tian. Gas-in-Place (GIP) Variation and Main Controlling Factors for the Deep Wufeng-Longmaxi Shales in the Luzhou Area of the Southern Sichuan Basin, China. Journal of Earth Science, 2023, 34(4): 1002-1011. doi: 10.1007/s12583-021-1593-x
Citation: Wei Wu, Peng Cheng, Shenyang Liu, Chao Luo, Haifeng Gai, Haitao Gao, Qin Zhou, Tengfei Li, Kesu Zhong, Hui Tian. Gas-in-Place (GIP) Variation and Main Controlling Factors for the Deep Wufeng-Longmaxi Shales in the Luzhou Area of the Southern Sichuan Basin, China. Journal of Earth Science, 2023, 34(4): 1002-1011. doi: 10.1007/s12583-021-1593-x

Gas-in-Place (GIP) Variation and Main Controlling Factors for the Deep Wufeng-Longmaxi Shales in the Luzhou Area of the Southern Sichuan Basin, China

doi: 10.1007/s12583-021-1593-x
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  • Corresponding author: Peng Cheng, chengp@gig.ac.cn
  • Received Date: 08 Nov 2021
  • Accepted Date: 02 Dec 2021
  • Available Online: 01 Aug 2023
  • Issue Publish Date: 30 Aug 2023
  • The Wufeng-Longmaxi Formation shales with burial depths > 3 500 m in the southern Sichuan Basin are believed to have large shale gas potentials. However, the reservoir properties and gas-in-place (GIP) contents of these shales exhibit variations across different sublayers. In this study, a set of Wufeng-Longmaxi shales with burial depths of 4 000–4 200 m was derived from the Well Y101H2 in the Luzhou area, and the differences in geological and geochemical characteristics, porosity, water saturation and GIP content of various sublayer shales were investigated. The results indicate that the TOC content and effective porosity of the upper (LMX1-4) and lower (LMX1-3) sublayer shales of the first member of the Longmaxi Formation are better than those of the Wufeng Formation (WF) shales, which results in the LMX1-4 and LMX1-3 shales having higher GIP contents than the WF shales. The GIP contents of the LMX1-3 shales are higher than those of the LMX1-4 shales, and this is likely because the organic matter of the LMX1-3 shales had more aquatic organisms and was preserved in a stronger reductive environment, which leads to a stronger gas generation potential. In contrast to the middle-shallow LMX1-4 shales in the Sichuan Basin, the deep LMX1-4 shales in the Luzhou area have advantageous reservoir properties and GIP contents, and thus it is promising to synchronously exploit the deep LMX1-4 and LMX1-3 shales in some regions of the southern Sichuan Basin.

     

  • Electronic Supplementary Materials: Supplementary material (Table S1) is available in the online version of this article at https://doi.org/10.1007/s12583-021-1593-x.
    Conflict of Interest
    The authors declare that they have no conflict of interest.
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