Relationship between multiscale nanopore structure and coal connectivity during coalification process | |
Shen Z; Meng ZP; Liu Y; Lei JH; Shen WJ(沈伟军); Ren HX; Gao TW; Zhang K; Wang YH; Tan LB | |
发表期刊 | Microporous and Mesoporous Materials |
2023-07 | |
卷号 | 360页码:112717 |
ISSN | 1387-1811 |
摘要 | The complex nanopore structures in coal provide the space for gas adsorption and migration, which is crucial for the development of coalbed methane. However, the mechanism of the evolution of multi-scale nanopore structures during coalification is still unclear. In this work, a combined method of CO2/N2 adsorption and synchrotron radiation Nano-CT experiments were used to reveal the multi-scale pore structure characterization during coalification. The synchrotron radiation Nano-CT experiment reconstructed the 3D pore network model for different rank coal and revealed the effective diameter is less than 0.5 μm, accounting for 97.4%–99.6% of the total number of macropores. The combination of these methods, including CO2/N2 adsorption and Nano-CT, accurately characterizes the multi-scale pore distribution in coal, ranging from <2 nm, 2–300 nm and 64 nm - 3.5 μm. The ultra-micropores occupy the primary advantage, accounting for approximately 60.3%–95.2% of the total pore volume and the micropores, mesopores and macropores are more poorly developed than ultra-micropores. During the coalification process, the proportion of porosity contributed by ultra-micropores to the total porosity gradually increases, with the contribution rising by 57.9%. The proportion of porosity contributed by micropores, mesopores and macropores to the total porosity gradually decreases, with the contribution decreasing by 81.0%, 82.8% and 93.6%, respectively. Besides, with growing coal maturity, the total permeability gradually decreases by 9.26 × 10−3 - 3.05 × 10−1 mD, which is negatively correlated with coal maturity during coalification. And the total permeability is mainly provided by macropores, which account for about 99% of the total permeability. This research provides an in-depth understanding of the storage and transport of coalbed methane in a multi-scale nanopore structure. |
DOI | 10.1016/j.micromeso.2023.112717 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:001034487800001 |
论文分区 | 二类/Q1 |
力学所作者排名 | 3+ |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/92493 |
专题 | 流固耦合系统力学重点实验室 |
作者单位 | 1.China University of Mining and Technology (Beijing) 2.Institute of Mechanics, Chinese Academy of Sciences 3.Henan Polytechnic University |
推荐引用方式 GB/T 7714 | Shen Z,Meng ZP,Liu Y,et al. Relationship between multiscale nanopore structure and coal connectivity during coalification process[J]. Microporous and Mesoporous Materials,2023,360:112717. |
APA | Shen Z.,Meng ZP.,Liu Y.,Lei JH.,Shen WJ.,...&Tan LB.(2023).Relationship between multiscale nanopore structure and coal connectivity during coalification process.Microporous and Mesoporous Materials,360,112717. |
MLA | Shen Z,et al."Relationship between multiscale nanopore structure and coal connectivity during coalification process".Microporous and Mesoporous Materials 360(2023):112717. |
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