ArticleACS omega2026
Multiscale Pore-Fracture Reconstruction and Seepability Enhancement of Coal by Hydraulic Fracturing: A Field-Laboratory Integrated Investigation.
Article in ACS omega, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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3 authors.
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Abstract
Clarifying the transformation mechanism of hydraulic fracturing on coal-rock pore-fracture structures and the associated seepage response is fundamental to the efficient development of low-permeability coalbed methane reservoirs. However, existing studies are hindered by a disconnect between field observations and laboratory evaluations, and the use of single characterization methods fails to capture the full-scale pore structures. To address these limitations, this study establishes a novel multiscale comparative framework that integrates primary coal, field-fractured coal, and laboratory-simulated fractured coal. This systematic approach was not previously implemented. A comprehensive suite of characterization techniques, including scanning electron microscopy, high-pressure mercury intrusion, low-temperature nitrogen adsorption, carbon dioxide adsorption, nuclear magnetic resonance, and overburden-pressure pore permeability measurements, is employed to elucidate the fracturing-induced alterations across the full pore size spectrum. The cross-scale fractal dimension evolution is quantitatively characterized, seepage differences among sample groups are compared, and the laboratory simulation method is rigorously validated against field-fractured samples. The results demonstrate that hydraulic fracturing shifts the pore structure from micropore-dominated to mesopore-macropore synergistic development with substantial enhancement of meso- and macropores. Meanwhile, stress-induced irreversible collapse of key adsorption micropores of 0.5 to 0.6 nm leads to a reduction in the CO
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