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<p>The pore–fracture architecture and connectivity network in coal reservoirs significantly influence the efficiency of coalbed methane production. This study employed a multi-methodological approach integrating mercury intrusion capillary pressure (MICP), X-ray computed tomography (CT), spontaneous imbibition (SI), and tracer-assisted scanning electron microscopy (SEM) to characterize high-rank coals from the Southern Qinshui Basin. Quantitative petrophysical parameters derived from MICP analyses revealed coal permeability (0.00023–0.0038 μm<sup>2</sup>) and effective tortuosity (96.93–469.40), while SI kinetics demonstrated imbibition slopes (0.32–0.66), indicating superior pore–fracture connectivity compared to shale. CT-based 3D reconstructions quantified critical connectivity metrics: connected pore volume fraction (0.15–1.91%), Euler number (143,389–340,274), and average coordination number (5.02–6.26). The tracer-enhanced SEM imaging revealed distinct pore-throat/fracture interconnection patterns. The key findings demonstrate that fracture connectivity is significantly better developed than that of pore connectivity, with pore connectivity showing a strong dependency on vitrinite reflectance, whereas fracture connectivity is predominantly governed by vitrinite composition. These results provide critical insights into the storage mechanisms and transport dynamics governing coalbed methane reservoirs.</p>

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Pore–Fracture Connectivity of High-Rank Coal in Qinshui Basin, China

  • 期刊论文

  • 发表日期：

    2025年8月16日

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  • Lei Han,
  • Dongxiang Huang,
  • Zhouyang Qiu,
  • Jian Shen,
  • Xiaodong Zhang,
  • Xiaoming Ni,
  • Zhenfeng Yu,
  • Jianping Bai,
  • Jindong Yang

摘要

The pore–fracture architecture and connectivity network in coal reservoirs significantly influence the efficiency of coalbed methane production. This study employed a multi-methodological approach integrating mercury intrusion capillary pressure (MICP), X-ray computed tomography (CT), spontaneous imbibition (SI), and tracer-assisted scanning electron microscopy (SEM) to characterize high-rank coals from the Southern Qinshui Basin. Quantitative petrophysical parameters derived from MICP analyses revealed coal permeability (0.00023–0.0038 μm2) and effective tortuosity (96.93–469.40), while SI kinetics demonstrated imbibition slopes (0.32–0.66), indicating superior pore–fracture connectivity compared to shale. CT-based 3D reconstructions quantified critical connectivity metrics: connected pore volume fraction (0.15–1.91%), Euler number (143,389–340,274), and average coordination number (5.02–6.26). The tracer-enhanced SEM imaging revealed distinct pore-throat/fracture interconnection patterns. The key findings demonstrate that fracture connectivity is significantly better developed than that of pore connectivity, with pore connectivity showing a strong dependency on vitrinite reflectance, whereas fracture connectivity is predominantly governed by vitrinite composition. These results provide critical insights into the storage mechanisms and transport dynamics governing coalbed methane reservoirs.