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    Volume 51 Issue 7
    Jul.  2026
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    Article Navigation >  Earth Science  > 2026  >  51(7): 2612-2625
    Zhou Sandong, Zhang Weixin, Cheng Qiaoyun, Liu Dameng, Yan Detian, 2026. Research Progress on Integration of Fracture Propagation and Enhanced Coalbed Methane Recovery in Deep Coal under Supercritical CO2. Earth Science, 51(7): 2612-2625. doi: 10.3799/dqkx.2026.132
    Citation: Zhou Sandong, Zhang Weixin, Cheng Qiaoyun, Liu Dameng, Yan Detian, 2026. Research Progress on Integration of Fracture Propagation and Enhanced Coalbed Methane Recovery in Deep Coal under Supercritical CO2. Earth Science, 51(7): 2612-2625. doi: 10.3799/dqkx.2026.132
    shu

    Research Progress on Integration of Fracture Propagation and Enhanced Coalbed Methane Recovery in Deep Coal under Supercritical CO2

    doi: 10.3799/dqkx.2026.132
    • 1.

      School of Earth Resources, China University of Geosciences (Wuhan), Wuhan 430074, China

    • 2.

      Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences (Wuhan), Wuhan 430074, China

    • 3.

      Hubei Key Laboratory of Oil and Gas Exploration and Development Theory and Technology, China University of Geosciences (Wuhan), Wuhan 430074, China

    • 4.

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

    • Received Date: 2025-12-28
    • Publish Date: 2026-07-25
      Abstract
    • Supercritical CO2 (Sc-CO2) fracturing in deep coal reservoirs offers dual benefits of enhanced permeability and carbon sequestration. This study integrates experimental analysis, theoretical modeling, and numerical simulation to investigate the mechanical response mechanisms of fracture initiation and propagation in deep coal reservoirs during Sc-CO2 fracturing, elucidate the mechanisms of production enhancement, and propose integrated research directions of fracture propagation and increased permeability and production. The results show that the fracture initiation and propagation of Sc-CO2 fracturing in deep coal reservoirs are jointly influenced by reservoir characteristics and CO2 injection parameters, with the mechanical response constrained by mechanisms including surface energy reduction, plasticization, expansion, and mineral dissolution. A staged model of thermo-hydro-mechanical coupling-energy and mass transfer can characterize the fracture propagation and production enhancement effects across stages (Sc-CO2 fracturing, phase-change fracturing, and modification). Sc-CO2 achieves production enhancement through methane displacement, mechanical weakening, and permeability increase. Future research should focus on the differential fracture propagation laws, the dynamic heterogeneous fracture propagation mechanisms, and the integrated evaluation for fracturing and production enhancement during Sc-CO2 fracturing in deep coal reservoirs. This research provides technical support for the Sc-CO2 fracturing design in deep coal reservoirs and coalbed methane production enhancement projects.

       

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