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[1]申文迈,范楠,邓存宝,等.低渗煤层孔裂隙特征结构表征与渗流指标相关性研究*[J].中国安全生产科学技术,2023,19(10):74-80.[doi:10.11731/j.issn.1673-193x.2023.10.010]
　SHEN Wenmai,FAN Nan,DENG Cunbao,et al.Study on structural characterization of pore fracture in low permeability coal seam and correlation of seepage indexes[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2023,19(10):74-80.[doi:10.11731/j.issn.1673-193x.2023.10.010]
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低渗煤层孔裂隙特征结构表征与渗流指标相关性研究*
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《中国安全生产科学技术》[ISSN:1673-193X/CN:11-5335/TB]

卷:
19
期数:
2023年10期
页码:
74-80
栏目:
职业安全卫生管理与技术
出版日期:
2023-10-31

文章信息/Info

Title:
Study on structural characterization of pore fracture in low permeability coal seam and correlation of seepage indexes
文章编号:
1673-193X(2023)-10-0074-07
作者:
申文迈; 范楠; 邓存宝; 谯永刚; 姚文军; 王鸿宇; 杜倩如; 原振淇
（太原理工大学 安全与应急管理工程学院，山西 晋中 030600)
Author(s):
SHEN Wenmai;  FAN Nan;  DENG Cunbao;  QIAO Yonggang;  YAO Wenjun;  WANG Hongyu;  DU Qianru;  YUAN Zhenqi
(College of Safety and Emergency Management Engineering, Taiyuan University of Technology, Jinzhong Shanxi 030600, China)
关键词:
低渗煤层; 微米CT; 三维重构; 等效孔裂隙网络模型; 孔裂隙结构参数
Keywords:
low permeability coal seam;  micron CT;  3D reconstruction;  equivalent pore fracture network model;  pore fracture structure parameter
分类号:
X936；TD712
DOI:
10.11731/j.issn.1673-193x.2023.10.010
文献标志码:
A
摘要:
为解决低渗煤层瓦斯抽采难度大、效率低等问题，以华晋焦煤沙曲一矿5#低渗煤层为研究对象，基于微米CT扫描实验，运用三维重构技术，探究低渗煤体孔裂隙结构特征与空间分布规律，通过构建具有拓扑结构的骨架化模型和等效孔裂隙网络模型，分析孔隙与喉道结构特征参数与渗流指标之间的关系。研究结果表明：在微米尺度下，沙曲一矿煤样裂隙对孔隙率的贡献远大于孔隙，孔隙以孔径在［53.13，100) μm的大孔为主；宽度在［0.1，1) mm，长度在［0.5，7) mm的微观小裂隙最多，占总裂隙的70.1%；通过统计孔裂隙网络模型提取出的孔隙和喉道发现，孔喉比较大，且连通路径单调，不利于气体运移。通过结构特征参数与渗流特性参数拟合，发现形状因子与孔隙直径呈正相关，迂曲度与孔隙直径、配位数与孔喉比均呈负相关。研究结果可为煤矿瓦斯高效抽采提供理论指导。
Abstract:
In order to solve the problems of large difficulty and low efficiency of gas extraction from low permeability coal seams, taking the No.5 low permeability coal seam of Shaqu No.1 mine of Huajin coking coal as the research object, the characteristics and spatial distribution of pore fracture structure in low permeability coal body were explored based on the micron CT scanning experiment and using the 3D reconstruction technology.By constructing the skeletonized model of topology structure and the equivalent pore fracture network model, the relationship between pore and throat structure characteristic parameters and seepage indexes was analyzed.The results show that at the micron scale, the contribution of fracture to the porosity of coal sample from Shaqu No.1 mine is much greater than that of pore, and the pore size is mainly the large pore size of ［53.13，100) μm.The microscopic small fractures with the width of ［0.1，1) mm and the length of ［0.5，7) mm are the most, accounting for 70.1% of the total fractures.By counting the pores and throats extracted from the pore fracture network model, the pore-throat ratio is relatively large, and the connecting path is monotonous, which is not conducive to gas migration.Through fitting the structural characteristic parameters and seepage characteristic parameters, it is found that the shape factor is positively correlated with pore diameter,while the tortuosity is negatively correlated with pore diameter，coordination number is negatively correlated with pore throat ratio.The results can provide theoretical guidance for the efficient extraction of coal mine gas.

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相似文献/References:

[1]韩颖,宋德尚.低渗煤层高压水射流割缝增透技术试验研究[J].中国安全生产科学技术,2014,10(12):35.[doi:10.11731/j.issn.1673-193x.2014.12.006]
　HAN Ying,SONG De-shang.Experimental study on permeability improvement technology by cutting seam using high pressure water jet in coal seam with low permeability[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2014,10(10):35.[doi:10.11731/j.issn.1673-193x.2014.12.006]
[2]贾同千,饶孜,何庆兵,等.复杂地质低渗煤层水力压裂-割缝综合瓦斯增透技术研究[J].中国安全生产科学技术,2017,13(4):56.[doi:10.11731/j.issn.1673-193x.2017.04.010]
　JIA Tongqian,RAO Zi,HE Qingbing,et al.Research on comprehensive gas permeability improvement technology by hydraulic fracturing and slotting in coal seam with complex geological conditions and low permeability[J].JOURNAL OF SAFETY SCIENCE AND TECHNOLOGY,2017,13(10):56.[doi:10.11731/j.issn.1673-193x.2017.04.010]

备注/Memo

备注/Memo:
收稿日期： 2023-04-11
* 基金项目： 山西省基础研究计划青年项目（202203021212291）；山西省高等学校科技创新项目（2021L058）
作者简介： 申文迈，硕士研究生，主要研究方向为矿井瓦斯防治与抽采高效利用。
通信作者： 范楠，博士，实验师，主要研究方向为矿井瓦斯防治与抽采高效利用。
更新日期/Last Update: 2023-11-06