ArticleScientific reports2026
Inhibition mechanisms of gas desorption and pressure inversion in water-bearing coal under stepwise decompression via volume expansion.
Article in Scientific reports, 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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Abstract
The interference of moisture in water-bearing coal seams on gas desorption is a key bottleneck restricting the accurate determination of in-situ pressure. In this study, we systematically elucidate the dual inhibition mechanisms of moisture on gas desorption through stepwise volume expansion experiments (moisture content gradient 0-5.11%) combined with multi-scale characterization techniques including low-field nuclear magnetic resonance, scanning electron microscopy, and mercury intrusion porosimetry. Two dominant mechanisms are identified: (1) Competitive adsorption, where moisture occupies mesopore surfaces (2–50 nm, dominant pore size 2.2–4.8 nm), leading to a 28.6% reduction in the Langmuir volume (a); (2) Pore throat blockage—capillary liquid bridges form within ink-bottle pores, hindering gas diffusion. Based on these mechanisms, a modified Langmuir model incorporating an adsorption attenuation coefficient (λ) is proposed, and a dual-mode pressure hierarchical/chained inversion algorithm is developed. The hierarchical method achieves a single-stage pressure inversion error < 1.65%, and the chained method shows a full-process inversion error of only 0.59% at a moisture content of 4.85%. The study indicates that the solidification effect of moisture on the pore system can enhance the predictability of pressure evolution. This method provides a theoretical framework for gas disaster prevention and control in water-bearing coal seams and contributes to improved accuracy in in-situ pressure determination.
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