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Pore Types and Characteristics of Ultra-Deep Shale of the Lower Paleozoic Wufeng-Longmaxi Formations in the Eastern Sichuan Basin

Author

Listed:
  • Ruolong Chi

    (School of Energy Resources, China University of Geosciences, Beijing 100083, China)

  • Ping Gao

    (School of Energy Resources, China University of Geosciences, Beijing 100083, China)

  • Yidong Cai

    (School of Energy Resources, China University of Geosciences, Beijing 100083, China)

  • Ruobing Liu

    (Sinopec Exploration Branch Company, Chengdu 610041, China)

  • Jinghan Du

    (School of Energy Resources, China University of Geosciences, Beijing 100083, China)

  • Qin Zhou

    (State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China)

Abstract

Recently, shale gas exploration of the Wufeng-Longmaxi formations (WF-LMX) in the Sichuan Basin has gradually stepped into deep to ultra-deep layers, but the pore types and characteristics of ultra-deep shale still remain unclear. In this study, the WF-LMX ultra-deep organic-rich shale samples in the Eastern Sichuan Basin were collected, and the types and development characteristics of shale pores were investigated by using high-resolution scanning electron microscopy (SEM). Our results showed that the pores of the WF-LMX ultra-deep shale reservoirs mainly included organic pores, mineral matrix pores (interparticle pores and intraparticle pores), and micro-fractures, which were dominated by organic pores, displaying oval, slit, and irregular shapes and a diameter of mainly 5–45 nm. Organic pores were poorly developed in primary organic matter (e.g., graptolite and radiolarian), while they were well developed in solid bitumen, being the most important nanopore type in shale. The pore development of ultra-deep shale was mainly controlled by the contents of organic matter and brittle minerals. Higher contents of organic matter and quartz are conducive to the development and preservation of organic pores, which are also favorable for ultra-deep shale gas exploration.

Suggested Citation

  • Ruolong Chi & Ping Gao & Yidong Cai & Ruobing Liu & Jinghan Du & Qin Zhou, 2023. "Pore Types and Characteristics of Ultra-Deep Shale of the Lower Paleozoic Wufeng-Longmaxi Formations in the Eastern Sichuan Basin," Energies, MDPI, vol. 16(17), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:17:p:6102-:d:1222074
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    References listed on IDEAS

    as
    1. Yanming Zhao & Ping Gao & Qin Zhou & Xianming Xiao & Yijie Xing & Wei Liu, 2022. "A Review of the Heterogeneity of Organic-Matter-Hosted Pores in Shale Reservoirs," Energies, MDPI, vol. 15(23), pages 1-26, November.
    2. Ping Gao & Xianming Xiao & Dongfeng Hu & Ruobing Liu & Yidong Cai & Tao Yuan & Guangming Meng, 2022. "Water Distribution in the Ultra-Deep Shale of the Wufeng–Longmaxi Formations from the Sichuan Basin," Energies, MDPI, vol. 15(6), pages 1-17, March.
    3. Zhiyu Li & Zhengdong Lei & Weijun Shen & Dmitriy A. Martyushev & Xinhai Hu, 2023. "A Comprehensive Review of the Oil Flow Mechanism and Numerical Simulations in Shale Oil Reservoirs," Energies, MDPI, vol. 16(8), pages 1-23, April.
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