基于扫描电镜的寺河矿3号煤微孔裂隙精细定量表征

煤的微孔裂隙是控制煤层气赋存和运移最为关键的因素，为了实现对寺河矿3号煤的微孔裂隙精细定量表征，利用EVO MA15钨灯丝扫描电子显微镜对其进行了大量观测和分析。研究发现:寺河矿3号煤中可见气孔、摩擦孔、溶蚀孔、铸模孔4种不同成因类型微孔隙发育且孔隙的连通性较差，不同成因类型微孔隙的发育程度、形态、大小、充填情况及其连通性等有所不同；煤中张、剪裂隙较发育，裂隙多呈张开状态且部分被充填；剪裂隙仅发育于原生结构煤中，而碎裂煤中张、剪裂隙均有发育，它们的展布形态、裂隙面宽度、裂隙充填情况等各异。

Fine quantitative characterization of microporous fractures in No.3 coal seam of Sihe Coal Mine based on scanning electron microscopy

Coal microporous fissures are the key factor to control the occurrence and migration of coalbed methane.In order to realize the fine quantitative characterization of microporous fissures in No.3 coal seam of Sihe Coal Mine，EVO MA15 tungsten filament scanning electron microscopy was used to observe and analyze a large number of them.It was found that there were four different genetic types of micropore in No.3 coal seam of Sihe Coal Mine:gas pore，friction pore，corrosion pore and casting pore，and the connectivity of micropore was poor.The development degree，shape，size，filling condition and connectivity of micropore were different in different genetic types.Tensile and shear cracks were well developed and there were many cracks in coal.It was open and partially filled.The shear fracture only develops in the primary structure coal，while the tension and shear cracks in the fractured coal develop.Their distribution patterns，width of fracture surface and filling conditions were different.