摘要
为探究原生煤和构造煤的孔裂隙结构特征,以山西吕梁华晋焦煤有限责任公司沙曲二号煤矿为研究对象,通过低场核磁共振手段研究了原生煤和构造煤的孔裂隙结构差异,并讨论了不同类型煤样T 2图谱、不同类型孔裂隙占比、有效孔隙率和孔隙分形维数等特征。结果表明:原生煤由微孔、中孔和大孔构成,且微孔占主导。构造煤由微孔、小孔、中孔和大孔构成,且中孔和大孔所占比例远大于原生煤。无论是饱和水煤样还是束缚水煤样,构造煤的孔裂隙复杂程度和分布范围均大于原生煤。对比了两种煤样瓦斯赋存和运移能力的差异,认为构造煤有利于瓦斯渗流,而原生煤则更有利于瓦斯吸附和扩散。通过计算得出构造煤的总孔隙率和有效孔隙率均大于原生煤,其孔裂隙结构更为发育。此外,结合分形理论发现构造煤吸附孔的复杂程度大于原生煤,而其渗流孔的复杂程度略小于原生煤。研究结果可为构造煤瓦斯灾害治理和煤层气高效开发提供一定理论参考。
In order to investigate the pore and fracture structure characteristics of primary and tectonic coals,the pore and fracture structure differences between primary and tectonic coals were investigated by means of low-field nuclear magnetic resonance in the Shaqu No.2 Coal Mine of Huajin Coking Coal Co.Ltd.in Lüliang,Shanxi,and the characteristics of different types of coal samples in terms of their T 2 spectra,the percentage of different types of pore and fracture,the effective porosity,and the pore fractal dimension were discussed.The results show that the primary coal consists of micropores,mesopores and macropores,and the micropores are dominant.Tectonic coal consists of micropores,small pores,mesopores and macropores,and the proportion of mesopores and macropores is much larger than that of the primary coal.In both saturated and bound water samples,the complexity and distribution of pores and fractures in tectonic coals are larger than those in primary coals.Comparing the differences in the gas storage and transport capacities of the two coal samples,it is concluded that the tectonic coal is favorable for gas seepage,while the primary coal is more conducive to gas adsorption and diffusion.The total porosity and effective porosity of the tectonic coal are calculated to be larger than those of the primary coal,and its pore and fracture structure is more developed.In addition,the complexity of adsorption pores in tectonic coal is larger than that in primary coal,while the complexity of seepage pores in tectonic coal is slightly smaller than that in primary coal.The results of this study can provide some theoretical references for the management of tectonic coal gas hazard and the efficient development of coalbed methane.
作者
武轶凡
杨文宇
李渊
WU Yi-fan;YANG Wen-yu;LI Yuan(China Coal Science and Industry Group Information Technology Co.,Ltd.,Xi'an 710000,China)
出处
《科学技术与工程》
北大核心
2024年第25期10739-10745,共7页
Science Technology and Engineering
基金
补连塔煤矿智能化建设研究与示范工程(HT[2021]51号)。
关键词
低场核磁共振
构造煤
原生煤
孔隙结构
low-field nuclear magnetic resonance
tectonic coal
primary coal
pore structure
作者简介
第一作者:武轶凡(1995-),男,汉族,陕西渭南人,硕士,助理工程师。研究方向:自动化控制,智能矿山建设。E-mail:yfw3420@163.com。
