The processes of shale gas transport and enrichment are closely related to the micro-fractures structure. Here, porosity, permeability test, gas adsorption, scanning electron microscopy (SEM), fluid spontaneous imbibition, Nano-CT, Micro-CT, and core observations were used to determine the types and characteristics of micro-fractures in the Longmaxi shales, Jiaoshiba area. The effects of micro-fractures on shale reservoir properties and shale gas accumulation were also analyzed. Diverse sizes of intra-particle (intraP), particle-edge, and transparticle micro-fractures were widely developed in shales. The difference of micro-fracture characteristics was mainly controlled by the mineral composition. The well-developed micro-fractures in the Longmaxi shales can act as a “bridge” to link nano-pores and macro-fractures. In such cases, a large-scale “escape network” composed of “nano-pores, micro-fractures, and macro-fractures” was formed. The escape of hydrocarbons along this network results in lower pore pressure. Most pores were dramatically compressed due to the compaction of overlying strata. As a result, the pore space and seepage capacity of organic-rich shales were disappointed, which is not benefit to the enrichment and production of shale gas. However, the limited development of micro-fractures will reduce the probability of forming “escape network”. Thus, some of the pores could be remained and act as storage space along with micro-fractures for shale gas even within the tectonically deformed area.

页岩气运移富集过程与微裂缝结构密切相关。在这里，利用孔隙度、渗透率测试、气体吸附、扫描电镜（SEM）、流体自吸、Nano-CT、Micro-CT和岩心观测等手段确定焦石坝龙马溪页岩微裂缝类型和特征。区域。还分析了微裂缝对页岩储层性质和页岩气聚集的影响。页岩中广泛发育了不同尺寸的颗粒内（intraP）、颗粒边缘和跨颗粒微裂缝。微裂缝特征的差异主要受矿物成分控制。龙马溪页岩发育良好的微裂缝可以作为连接纳米孔隙和宏观裂缝的“桥梁”。在这种情况下，形成了由“纳米孔、微裂缝、宏观裂缝”组成的大规模“逃逸网络”。碳氢化合物沿该网络逸出导致孔隙压力降低。由于上覆地层的压实作用，大多数孔隙被剧烈压缩。导致富有机质页岩孔隙空间和渗流能力下降，不利于页岩气的富集和生产。然而，微裂缝的有限发展将降低形成“逃逸网络”的概率。因此，即使在构造变形区域内，也可以保留一些孔隙并与页岩气的微裂缝一起作为储存空间。由于上覆地层的压实作用，大多数孔隙被剧烈压缩。导致富有机质页岩孔隙空间和渗流能力下降，不利于页岩气的富集和生产。然而，微裂缝的有限发展将降低形成“逃逸网络”的概率。因此，即使在构造变形区域内，也可以保留一些孔隙并与页岩气的微裂缝一起作为储存空间。由于上覆地层的压实作用，大多数孔隙被剧烈压缩。导致富有机质页岩孔隙空间和渗流能力下降，不利于页岩气的富集和生产。然而，微裂缝的有限发展将降低形成“逃逸网络”的概率。因此，即使在构造变形区域内，也可以保留一些孔隙并与页岩气的微裂缝一起作为储存空间。