不同层理高阶煤孔隙特征的核磁共振试验*

doi:10.16265/j.cnki.issn1003-3033.2021.09.012

中国安全科学学报 ›› 2021, Vol. 31 ›› Issue (9): 83-89.doi: 10.16265/j.cnki.issn1003-3033.2021.09.012

不同层理高阶煤孔隙特征的核磁共振试验^*

刘佳佳^1,2,3 副教授, 胡建敏¹, 杨明¹ 教授, 方迎香¹, 贾改妮¹

1 河南理工大学安全科学与工程学院,河南焦作 454003;
2 河南理工大学煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作 454003;
3 河南理工大学河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地,河南焦作 454003

收稿日期:2021-06-12 修回日期:2021-08-10 出版日期:2021-09-28 发布日期:2022-03-28
作者简介:刘佳佳 (1985—),男,河南焦作人,博士,副教授,硕士生导师,主要从事矿井灾害防治、地下空间工程和煤层气开发等方面的教学与科研工作。E-mail: liujiajia8803@163.com。
胡建敏 (1995—),女,河南新乡人,硕士研究生,研究方向为矿井瓦斯灾害防治。E-mail: hjm15039102350@163.com。
基金资助:
国家自然科学基金资助(52074106,51734007);中国博士后基金资助(2019M652536);中原博士后创新人才项目(ZYQR201810171);河南省博士后科研项目(001801016)。

Nuclear magnetic resonance experimental study on pore characteristics of high rank coal with different bedding

LIU Jiajia^1,2,3, HU Jianmin¹, YANG Ming¹, FANG Yingxiang¹, JIA Gaini¹

1 School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454003, China;
2 Henan Collaborative Innovation Center of Coal work Safety and Clean-efficiency Utilization, Henan Polytechnic University,Jiaozuo Henan 454003,China;
3 Henan Provincial Key Laboratory of Gas Geology and Gas Control-provincial and Ministry of State Key Laboratory Breeding Base, Henan Polytechnic University, Jiaozuo Henan 454003, China

Received:2021-06-12 Revised:2021-08-10 Online:2021-09-28 Published:2022-03-28

摘要/Abstract

摘要： 为探究不同层理高阶煤的孔隙分布特征,开展饱水煤样不同离心力条件下的核磁共振(NMR)试验。首先,分别选择3个平行和垂直层理的高阶煤样;然后,用低场NMR系统测试饱水煤样不同离心力下的T₂图谱、核磁孔隙度等。结果表明:高阶煤以吸附孔最为发育,其次是渗流孔和裂隙,煤样大孔和裂隙中的水分最先在离心力的作用下被分离,但微小孔中的水分很难被分离;平行和垂直层理煤样随着离心力的增加,T₂图谱峰值、峰面积和核磁孔隙度均呈逐步减小的趋势,平行和垂直层理煤样的核磁孔隙度和离心力之间符合指数函数关系;垂直层理煤样T_2C(T₂截止值)是平行层理煤样的1.44倍,垂直层理煤样的T_2C随着离心力增加而增大,平行层理煤样的T_2C随离心力增加呈先增大后减小的特征。

关键词: 不同层理, 高阶煤, 孔隙度, 核磁共振(NMR), 离心力, T₂图谱

Abstract: In order to study pore distribution characteristics of high rank coal with different bedding, NMR experiments were carried out under different centrifugal forces of saturated coal samples. Firstly, three high rank coals with parallel bedding and three vertical bedding were selected. Then, T₂ pattern and NMR porosity of saturated coal samples under different centrifugal forces were measured by low field NMR system. The results show that adsorption pores are the most developed in high-rank coal, followed by seepage pores and cracks. Water in large pores and cracks of coal samples is easy to be ejected under centrifugal force, but water in tiny pores is difficult to be ejected. Parallel and vertical stratification of coal sample with the increase of centrifugal force, peak, peak area of T₂ spectrum and nuclear magnetic porosity have been gradually decreases, parallel and vertical stratification of coal sample nuclear magnetic accords with exponential function relationship between porosity and centrifugal force. T_2C (T₂ cutoff value) vertical stratified coal sample is 1.44 times that of parallel stratified coal sample. T_2C of vertical stratified coal sample increases with the increase of centrifugal force, while T_2C of parallel stratified coal sample increases first and then decreases with the increase of centrifugal force.

Key words: different bedding, high-rank coal, porosity, nuclear magnetic resonance(NMR), centrifugal force, T₂ spectrum

中图分类号:

X936

刘佳佳, 胡建敏, 杨明, 方迎香, 贾改妮. 不同层理高阶煤孔隙特征的核磁共振试验^*[J]. 中国安全科学学报, 2021, 31(9): 83-89.

LIU Jiajia, HU Jianmin, YANG Ming, FANG Yingxiang, JIA Gaini. Nuclear magnetic resonance experimental study on pore characteristics of high rank coal with different bedding[J]. China Safety Science Journal, 2021, 31(9): 83-89.

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不同层理高阶煤孔隙特征的核磁共振试验^*

Nuclear magnetic resonance experimental study on pore characteristics of high rank coal with different bedding

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