宏观煤岩类型和煤体结构控制下的孔隙结构特征研究  

Study on Pore Structure Characteristics under the Control of Macrolithotype and Coal Structure

作　　者：赵明恩 梁国栋 杨佳佳 张学宇 刘赛飞 田林 侯海海 ZHAO Mingen;LIANG Guodong;YANG Jiajia;ZHANG Xueyu;LIU Saifei;TIAN Lin;HOU Haihai(College of Mining,Liaoning Technical University,Fuxin,Liaoning 123000;School of Resources and Environment,Henan Polytechnic University,Jiaozuo,Henan 454000)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]河南理工大学资源环境学院,河南焦作454000

出　　处：《中国煤炭地质》2024年第10期1-5,共5页Coal Geology of China

基　　金：大学生创新创业训练项目“不同类型构造煤的煤岩学差异及对孔隙结构影响机理”(S202210147037);国家自然科学基金项目“相似变质变形构造煤显微煤岩差异下的孔裂隙结构演化规律研究”(42102223)。

摘　　要：基于煤岩学(宏观煤岩描述、镜质体反射率测定和显微煤岩组分鉴定)、煤的工业分析和低温氮气吸附实验,对山西潞安矿区下二叠统山西组6个煤样进行了宏观煤岩类型和煤体结构双重控制下的孔隙结构特征研究。结果表明,从光亮型煤至暗淡型煤,过渡孔体积占比依次升高,半亮型煤和半暗型煤的微孔体积占比高于光亮型煤和暗淡型煤,光亮型煤和半亮型煤的中孔体积占比要明显高于半暗型煤和暗淡型煤;从原生结构煤至糜棱结构煤,煤的微孔和过渡孔体积占比显著提高,中孔体积占比有所下降。相同煤体结构下半暗型煤和暗淡型煤孔隙比表面积、孔隙粗糙度、总孔体积和孔隙结构复杂度高于光亮型煤和半亮型煤。碎粒结构煤和糜棱结构煤的比表面积和总孔体积显著高于原生结构煤和碎裂结构煤,轻微变形下煤的孔隙结构变化不明显,严重破坏下煤的比表面积和总孔体积显著升高,这应该与变形破坏煤内部分子结构,使之产生了更多的孔隙和裂隙有关。分析宏观煤岩类型与煤体结构双控下的煤孔隙结构特征,对于指导煤层气的勘探开发和煤矿井下瓦斯的预测防治具有重要意义。Based on coal petrology(macroscopic description,vitrinite reflectivity determination and maceral identification),proximate analysis and low-temperature nitrogen adsorption experiments,the characteristics of pore structure under the dual control of macrolithotype and coal structure were studied for the six coal samples from Lower Permian Shanxi Formation in Lu’an coal mining.The results show that the volume of transition pore increases from bright coal to dull coal;The proportion of microporous volume of semi-bright coal and semi-dull coal is higher than that of bright coal and dull coal,whereas the medium pore volume of bright coal and semi-bright coal is significantly higher than that of semi-dull coal and dull coal.From primary structure coal to mylonitic structure coal,the volume proportion of micropore and transition pore significantly increases,while the volume of middle pore decreases.The specific surface area,pore roughness,total pore volume and pore structure complexity of semi-dull coal and dull coal under the same coal structure are higher than those of bright coal and semi-bright coal.The specific surface area and total pore volume of granulitic structure coal and mylonitic structure coal are significantly higher than those of primary structure coal and cataclastic structure coal.The coal pore structure under a slight deformation does not change significantly;Howerver,the specific surface area and total pore volume under a serious damage significantly increase;which should be related to the deformation destroying on the molecular structure of coal with more pores and cracks.It is of great significance to analyze the coal pore structure characteristics under the dual control of macrolithotype and coal structure to guide the exploration and development of coalbed methane and the prediction of underground gas in coal mine.

关 键 词：山西组 煤层气 宏观煤岩类型 煤体结构 孔隙结构 

分 类 号：P618.11[天文地球—矿床学]