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<p>The deep Longmaxi shale in the southern Sichuan Basin of China holds significant shale gas resources and is poised for future development. Deep shales experience elevated stresses, where high water injection pressures resulting from hydraulic fracturing may activate preexisting faults, potentially leading to induced seismicity. We conducted friction tests on Longmaxi shale fault gouges from LU211, LU221, and ZU207 wells under in situ temperature and pressure conditions to observe changes in frictional behavior. Our results reveal significant variation in mineral content, particularly clay minerals (ranging from 10 to 45%), which corelates with frictional behavior. Some samples (~ 4.9 km depth) exhibited velocity weakening frictional behavior, exacerbated by increased temperature, indicating the potential for induced seismicity due to high-pressure water injection in deep shale fault zones in Sichuan Basin. These findings underscore the complexity of hydraulic fracturing in deep shale reservoirs, highlighting the need for comprehensive risk assessment and mitigation strategies in shale gas exploration and production.</p>

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Frictional Stability of Deep Longmaxi Shale in the Southern Sichuan Basin: In Situ Temperature and Pressure Effects on Injection-Induced Seismicity

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Jianhang Lv,
  • Fengshou Zhang,
  • Mengke An

摘要

The deep Longmaxi shale in the southern Sichuan Basin of China holds significant shale gas resources and is poised for future development. Deep shales experience elevated stresses, where high water injection pressures resulting from hydraulic fracturing may activate preexisting faults, potentially leading to induced seismicity. We conducted friction tests on Longmaxi shale fault gouges from LU211, LU221, and ZU207 wells under in situ temperature and pressure conditions to observe changes in frictional behavior. Our results reveal significant variation in mineral content, particularly clay minerals (ranging from 10 to 45%), which corelates with frictional behavior. Some samples (~ 4.9 km depth) exhibited velocity weakening frictional behavior, exacerbated by increased temperature, indicating the potential for induced seismicity due to high-pressure water injection in deep shale fault zones in Sichuan Basin. These findings underscore the complexity of hydraulic fracturing in deep shale reservoirs, highlighting the need for comprehensive risk assessment and mitigation strategies in shale gas exploration and production.