CO2相転移破砕を受けた石炭中のマルチスケール亀裂-細孔構造のマルチフラクタル進化特性
Multifractal Evolution Characteristics of Multiscale Fracture-Pore Structures in Coal under CO2 Phase-Transition Fracturing (原題)
Zhen Zhang, Gaofeng Liu, Yongliang He, Xiaoming Wang, George Barakos, Ping Chang
🤖 gxceed AI 要約
日本語
CO2相転移破砕（CO2–PTF）を石炭試料に適用し、CT・水銀圧入・低温N2/CO2吸着を用いてマルチスケール亀裂-細孔構造の変化を定量化した研究。破砕により亀裂の体積・表面積・最大長が大幅に増加し、マクロ孔は拡大・転換する一方、微細孔は化学的性質によりほとんど改質されないことをマルチフラクタル解析で示した。今後の炭層刺激にはグリーンな化学的手法が必要と結論づける。
English
This study applies CO2 phase-transition fracturing (CO2–PTF) to coal samples and quantifies multiscale fracture-pore changes using CT, HPMI, LTNA and LTCA. Fracturing sharply increases fracture volume, surface area and maximum length, enlarges macropores while leaving micropores largely unaltered, and multifractal analysis reveals rising local heterogeneity. The authors call for green chemical stimulation technologies for coal reservoirs.
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
CO2–PTFは炭層メタン増進回収（ECBM）とCO2地中貯留の複合技術として、日本のCCUS実証や脱炭素技術ロードマップに関連する。ただし本論文は岩石物性の基礎研究であり、日本企業の開示・投資判断への直接的示唆は限定的。
In the global GX context
CO2-based reservoir stimulation sits at the intersection of CCUS and enhanced coalbed methane, a niche but relevant pathway in global decarbonization portfolios. The multifractal characterization method adds to the technical evidence base for CO2 utilization in subsurface energy systems, though it does not address disclosure or accounting frameworks.
👥 読者別の含意
🔬研究者:CO2–PTF後の多スケール細孔構造評価にマルチフラクタル解析を適用する手法が参考になる。
🏢実務担当者:炭層刺激やCCUS関連設備の設計検討時に、微細孔への改質限界という技術的制約を把握できる。
🏛政策担当者:CCUS/ECBM技術の実装可能性評価において、微細孔改質の限界という技術的制約を政策設計に反映すべき。
📄 Abstract（原文）
Abstract To deeply analyze the multifractal evolutionary characteristics of multiscale fracture-pore structures in coal subjected to CO2 phase transition fracturing (CO2–PTF), CO2–PTF experiments on coal samples were carried out in this study. Multiple multiscale fracture-pore characterization techniques, including computed tomography (CT) scanning, high-pressure mercury intrusion (HPMI), low-temperature N2 adsorption (LTNA), and low-temperature CO2 adsorption (LTCA), were adopted to systematically investigate the variations in fracture-pore structural parameters of coal after CO2–PTF treatment. Moreover, classical multifractal theory was introduced to explore the multifractal responses of the fracture–macropore–mesopore–micropore system in CO2–PTF coal, and to uncover the evolution of local heterogeneity within the multiscale fracture-pore structural system. The results indicate that CO2–PTF induces fracture generation and expansion-transformation effects in coal, causing the volume, surface area, and maximum length of the fractures in coal to increase significantly by 2626.55%, 833.12%, and 115.93%, respectively. This leads to a pronounced increase in the heterogeneity of fracture distribution across low-probability, high-probability, and overall zones. For macropore–mesopore structures, CO2–PTF has a pore enlargement-conversion effect, which enhances the heterogeneity of macropore distribution in low-probability, high-probability, and overall zones, yet reduces the heterogeneity of mesopore distribution over these three regions. Notably, CO2–PTF imposes no obvious transformation effect on micropore structures, which arises from the chemical properties of micropores. Such chemical characteristics of micropores limit the effective transformation and stimulation of coal reservoirs via CO2–PTF. Accordingly, future studies should focus on green chemical stimulation technologies for coal reservoirs.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.1021/acs.energyfuels.6c04188first seen 2026-10-18 04:55:00
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