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<p>The migration of fluids in deep reservoirs leads to an increase in the effective stress of reservoir rocks, thereby affecting the stability of the strata. This study uses the Discrete Element Method (DEM) to thoroughly investigate the impact of "rock compaction layers" (RCL) formed by the compaction of fractures or thin layers on the stability of strata. The study simulated RCLs of varying thicknesses, dip angles, and confining pressures to analyze their macroscopic and microscopic responses during axial compression. The results indicate that the presence of RCL significantly alters the particle contact network, leading to changes in stress transfer pathways and rearrangement of the particle structure. With the increase of confining pressure, the anisotropic effect of RCL diminishes, and the contacts between particles become more uniform. Additionally, the dip angle of the RCL significantly influences its mechanical behavior, with RCLs at larger dip angles exhibiting lower stability during the loading process. By analyzing microparameters such as particle coordination number, Voronoi packing fraction, and particle rotation, the evolutionary laws of the internal structure of the RCL are revealed. This study provides a new perspective for understanding compacted layers of deep rock formations.</p>

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Mechanical Behavior of Deep Rock Compaction Layers and Its Effect on Formation Stability

  • 期刊论文

  • 发表日期：

    2025年10月3日

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  • Mingxin Liu,
  • Yongfei Yang,
  • Fugui Liu,
  • Jiawei Zhang,
  • Jianzhong Zhang,
  • Hai Sun,
  • Lei Zhang,
  • Junjie Zhong,
  • Kai Zhang,
  • Jun Yao

摘要

The migration of fluids in deep reservoirs leads to an increase in the effective stress of reservoir rocks, thereby affecting the stability of the strata. This study uses the Discrete Element Method (DEM) to thoroughly investigate the impact of "rock compaction layers" (RCL) formed by the compaction of fractures or thin layers on the stability of strata. The study simulated RCLs of varying thicknesses, dip angles, and confining pressures to analyze their macroscopic and microscopic responses during axial compression. The results indicate that the presence of RCL significantly alters the particle contact network, leading to changes in stress transfer pathways and rearrangement of the particle structure. With the increase of confining pressure, the anisotropic effect of RCL diminishes, and the contacts between particles become more uniform. Additionally, the dip angle of the RCL significantly influences its mechanical behavior, with RCLs at larger dip angles exhibiting lower stability during the loading process. By analyzing microparameters such as particle coordination number, Voronoi packing fraction, and particle rotation, the evolutionary laws of the internal structure of the RCL are revealed. This study provides a new perspective for understanding compacted layers of deep rock formations.