陕北侏罗纪煤田内的煤层富水问题较为特殊，严重影响着矿井安全生产。针对榆横北区巴拉素煤矿2号富水煤层微观结构特征，开展了孔渗分析、扫描电镜、核磁共振、CT扫描等实验研究，对比其他富水煤层，发现了2号富水煤层的微观特性。结果表明：巴拉素井田2号煤孔隙度相对最高，在30.16%～31.93%之间，平均约30.89%；除了各煤层普遍存在的生物孔和摩擦孔，2号煤层内还发育有表征活跃地下水活动的溶蚀孔，同时微裂隙的类型、数量也相对较多，其内部孔隙中可自由活动的重力水含量最高（高约10%以上）；结合水为其他煤层内部水体主要赋存形式，相同孔径的孔隙占比中，巴拉素2号煤层仍最具有最大优势（16%）；相对于同井田3号煤层和相邻大海则井田2号煤层，巴拉素井田2号煤层具有较好的微观孔隙数量和空间，由此也反映出2号煤层具备存储和运移地下水的优势介质条件。

The water-rich problem of coal seam in Jurassic coal field in northern Shaanxi Province is very special, which seriously affects the safety of mine production. According to the microstructure characteristics of No.2 water-rich coal seam in Balasu Coal Mine, northern Yuheng Mining Area, the experimental study was carried out including pore permeability analysis, scanning electron microscope, nuclear magnetic resonance and CT scanning. Comparing with other non-water-rich coal seams, the microscopic characteristics of the No.2 water-rich coal seam are found. The results show that, the porosity of No.2 coal in Balasu Mine Field is the highest, ranging from 30.16% to 31.93%, with an average of 30.89%. In addition to the common biological pores and friction pores in all coal seams, the No.2 coal seam also has erosion pores that represent active groundwater activities, and the types and quantities of micro-fractures are relatively large. The content of gravity water that can move freely in the inner pores is the highest（more than 10%）, and binding water is the main occurrence form of other internal water bodies of coal seams. For the same pore size, Balasu No.2 coal seam still has the largest advantage（16%）. Compared to No.3 coal seam in the same mine field and the No.2 coal seam in adjacent Dahaize Mine Field, No.2 coal seam in Balasu Mine Field has better microscopic pore quantity and space. It also reflects that the No.2 coal seam has the dominant medium conditions for storing and migrating groundwater.