LCO2相転移処理による石炭の孔隙-亀裂構造の進化と結合損傷-浸透特性：3Dデジタルコア研究
Evolution of Pore-Fracture Structure and Coupled Damage–Seepage Characteristics of Coal Induced by LCO2 Phase-Transition Treatment: A 3D Digital Core Study (原題)
Xianke Wang, Yonggang Qiao, Nan Fan, Danping Yuan, Shida Zhang, Yongliang Mu
🤖 gxceed AI 要約
日本語
本研究は、LCO2相転移処理による石炭の孔隙-亀裂構造の進化をマイクロCTと3D再構築技術で定量的に解明。処理により孔隙率が6.27%から10.42%に増加し、連結性が向上。数値シミュレーションで、損傷開始応力が4MPaに低下し、平均浸透速度が1.5～1.9倍に増加することを示した。低浸透性炭層のガス輸送能力向上に寄与する。
English
This study uses micro-CT and 3D reconstruction to quantify pore-fracture evolution in coal under LCO2 phase-transition treatment. Porosity increases from 6.27% to 10.42%, connectivity improves, and numerical simulations show damage initiation stress drops to 4 MPa while mean seepage velocity rises 1.5-1.9 times. Findings support enhanced gas transport in low-permeability coal seams.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本ではCCUS技術の一部としてLCO2利用が注目されるが、本論文は石炭層のガス抽出に焦点を当てており、日本の脱炭素政策（例えばCCS事業化）への直接的な示唆は限定的。ただし、地下でのCO2挙動理解は地層評価に応用可能。
In the global GX context
Globally, LCO2 fracturing is explored for enhanced gas recovery and CO2 storage. This paper provides micro-scale evidence of pore structure changes, relevant to CCUS projects in coal-bearing formations. However, its direct link to decarbonization is indirect, as it focuses on coalbed methane extraction.
👥 読者別の含意
🔬研究者:Provides quantitative pore-scale data on LCO2 fracturing effects, useful for modeling CO2 storage or enhanced gas recovery.
📄 Abstract（原文）
Abstract This study combines micro-CT scanning with Avizo-based three-dimensional reconstruction technology to quantitatively characterize the evolution of pore-fracture structures in coal during LCO2 phase-transition treatment and systematically investigates the coupled response of damage evolution and seepage behavior under different stress conditions based on digital coal core models. Results show that LCO2 phase-transition treatment significantly reconstructs the coal pore-fracture network, promoting the development of large pores and preferential seepage pathways while increasing porosity from 6.27% to 10.42% and markedly enhancing pore-fracture connectivity. The dominant peak of the shape factor increases from 2 to 7, accompanied by a 1.41% increase in the average fractal dimension and a 19.2% reduction in fluctuation, indicating an enhanced structural complexity and heterogeneity of the pore-fracture system. Meanwhile, the proportions of large throats and highly coordinated pores both increase significantly, further optimizing the pore-fracture topology. After fracturing, the throat tortuosity distribution converges toward the low-value range, suggesting straighter seepage pathways and a reduced flow resistance. Numerical simulations reveal that the reconstructed pore-fracture network alters the internal stress distribution and induces pronounced matrix-pore heterogeneous deformation, with the pore volumetric strain reaching 3–5 times that of the matrix. LCO2 treatment lowers the damage initiation stress to 4 MPa and accelerates structural failure at 12 MPa while increasing the mean seepage velocity by 1.5–1.9 times. These findings demonstrate that the LCO2 phase-transition treatment effectively enhances pore connectivity and gas transport capacity in low-permeability coal seams.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acs.energyfuels.6c02565first seen 2026-09-05 05:18:44
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