黔西南盘江矿区中煤阶煤孔隙结构综合表征及多尺度分形特征

doi:10.3969/j.issn.1006-6535.2025.02.004

摘要/Abstract

摘要： 为探究黔西南盘江矿区二叠系龙潭组中煤阶煤孔隙结构及孔径分形特征,通过高压压汞实验、低温氮气吸附实验对孔隙结构进行精细表征,基于分形理论对比分析中煤阶煤孔隙结构的多尺度特征。结果表明:研究区中煤阶煤微孔和小孔较为发育,孔隙开放程度与连通性较好,孔隙分形特征较为显著;中煤阶煤综合分形维数可较好地反映中煤阶煤的变质程度,并与兰氏体积和兰氏压力呈现一定的正相关性,在一定程度上反映了煤层气赋存情况与解吸难易程度,即中煤阶煤分形维数越大,越有利于煤层气的开发与利用。该研究结论可为研究区后续的勘探开发工作提供数据和理论支撑。

关键词: 中煤阶煤, 孔隙结构, 分形理论, 高压压汞, 氮气吸附, 盘江矿区

Abstract: In order to explore the pore structure and pore size fractal characteristics of coal rank coal in Permian Longtan Formation of Panjiang Mining Area in southwestern Guizhou,the pore structure was characterized through high pressure mercury injection experiment and low temperature nitrogen adsorption experiment.Moreover,the multi-scale characteristics of the pore structure of medium-rank coal were compared and analyzed based on fractal theory.The findings indicate that the micropores and small pores of medium rank coal in the study area are rather developed,the pore connectivity is good,and the pore fractal characteristics are significant.The comprehensive fractal dimension of medium-rank coal is capable of reflecting more effectively the metamorphic degree of medium-rank coal,and has a certain positive correlation with Langmuir volume and Langmuir pressure.To a certain extent,it reflects the deposition feature and desorption difficulty of coalbed methane,that is,the larger the fractal dimension of medium-rank coal,the more conducive to the development and utilization of coalbed methane.The findings of this study can provide valuable data and theoretical basis for further exploration and development in the field of research.

Key words: medium-rank coal, pore structure, fractal theory, high pressure mercury injection, nitrogen adsorption, Panjiang Mining Area

中图分类号:

TE132

胡永忠, 徐再刚, 邓恩德. 黔西南盘江矿区中煤阶煤孔隙结构综合表征及多尺度分形特征[J]. 特种油气藏, 2025, 32(2): 33-41.

HU Yongzhong, XU Zaigang, DENG Ende. Comprehensive characterization of pore structure and multi-scale fractal features of medium-rank coal in Panjiang Mining Area,southwestern Guizhou[J]. Special Oil & Gas Reservoirs, 2025, 32(2): 33-41.

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