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Peer-reviewedCC BY-NC-ND 4.0ACS Omega

Coupling Characteristics and Sensitivity Differences of Coal Porosity and Permeability with Stress in Different Wellfields of Fukang Mining Area

  • Bing Bai1
  • Jienan Pan1
  • Zhenzhi Wang1
  • Yidong Li1
  • Meng Li1
  • Xuetian Du1
  • Nannan Cheng1
  1. 1Henan Polytechnic University , , ,
Open at sourcePDFDOICite

Abstract

Quantifying how coal porosity and permeability vary with effective stress is essential for forecasting coalbed methane (CBM) deliverability, yet the coupled stress response of low-rank coals and its variation among wellfields remain poorly constrained. Nine cores from three wellfields of the Fukang mining area─Kuangou (KG), Wudong (WD), and Donggou (DG)─were tested under stepwise hydrostatic loading of 2.07–15.86 MPa while porosity and permeability were measured simultaneously. Both properties decrease exponentially with stress, but permeability declines far more strongly: at maximum loading, the porosity damage ratio ranges from 15.9% to 69.55%, whereas the permeability damage ratio reaches 82.2–96.7%, and permeability sensitivity across wellfields follows DG ≈ WD > KG. A porosity–permeability ratio (e = φ/k) and a relative sensitivity parameter (R) were introduced to quantify the storage–seepage mismatch, with e rising continuously along the loading path. Fracture density, aperture, pore-throat connectivity, and mineral infilling jointly govern the heterogeneous response. The results provide quantitative criteria for staged depressurization and fracturing design in low-rank CBM development.

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Cite

BibTeXRIS
BibTeX
@article{bai2026coupling,
  title = {{Coupling Characteristics and Sensitivity Differences of Coal Porosity and Permeability with Stress in Different Wellfields of Fukang Mining Area}},
  author = {Bing Bai and Jienan Pan and Zhenzhi Wang and Yidong Li and Meng Li and Xuetian Du and Nannan Cheng},
  journal = {ACS Omega},
  year = {2026},
  month = oct,
  doi = {10.1021/acsomega.6c09182},
  url = {https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c09182/5458804/Coupling-Characteristics-and-Sensitivity},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - JOUR
TI  - Coupling Characteristics and Sensitivity Differences of Coal Porosity and Permeability with Stress in Different Wellfields of Fukang Mining Area
AU  - Bing Bai
AU  - Jienan Pan
AU  - Zhenzhi Wang
AU  - Yidong Li
AU  - Meng Li
AU  - Xuetian Du
AU  - Nannan Cheng
PY  - 2026
DA  - 2026/10/27
JO  - ACS Omega
DO  - 10.1021/acsomega.6c09182
UR  - https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c09182/5458804/Coupling-Characteristics-and-Sensitivity
AB  - Quantifying how coal porosity and permeability vary with effective stress is essential for forecasting coalbed methane (CBM) deliverability, yet the coupled stress response of low-rank coals and its variation among wellfields remain poorly constrained. Nine cores from three wellfields of the Fukang mining area─Kuangou (KG), Wudong (WD), and Donggou (DG)─were tested under stepwise hydrostatic loading of 2.07–15.86 MPa while porosity and permeability were measured simultaneously. Both properties decrease exponentially with stress, but permeability declines far more strongly: at maximum loading, the porosity damage ratio ranges from 15.9% to 69.55%, whereas the permeability damage ratio reaches 82.2–96.7%, and permeability sensitivity across wellfields follows DG ≈ WD > KG. A porosity–permeability ratio (e = φ/k) and a relative sensitivity parameter (R) were introduced to quantify the storage–seepage mismatch, with e rising continuously along the loading path. Fracture density, aperture, pore-throat connectivity, and mineral infilling jointly govern the heterogeneous response. The results provide quantitative criteria for staged depressurization and fracturing design in low-rank CBM development.
SN  - 2470-1343
ER  -