华北地区不同变质程度煤的物性特征及成因探讨

通过对采自华北9个矿区10块煤岩样品进行了镜质组反射率测定、显微组分分析、比表面积测试、显微裂隙统计和甲烷等温吸附试验，分析了不同变质程度煤的物性特征，并结合华北煤的变质背景，探讨了其物性差异的形成原因。研究发现，煤的变质程度和变质类型影响煤的显微组构、孔隙结构和裂隙演化规律，这是造成煤物性差异的主要原因。微观分析表明，煤在不同的变质阶段，其大分子结构发生一系列变化，造成煤的比表面积和吸附能力的大小呈现规律性的变化。

Discussion on Coal Physical Properties and Formation with Different Metamorphic Degree in North China

With the vitrinite reflectance measurement,macerals analysis,specific surface area measurement;micro-fracture statistics and methane isothermal adsorption experiments of ten coal and rock samples from nine mining areas in North China,the physical properties of the coal with different metamorphic degree were analyzed.In combination with the metamorphic background of North China coal,the formation causes of the physical differences were discussed.The study showed the coal metamorphic degree and the metamorphic type would affect to the coal micro structure,the pore structure and fracture evolution law and those would be the main causes to the physical differences of coal.The micro analysis showed that when coal at different metamorphic stage,its macromolecule structure would have series variation and thus would cause the coal specific surface area and adsorption capacity with a regularly variation.