页岩孔隙系统表现为多尺度耦合的流动空间，包括微纳米量级孔隙、微米量级和更大尺度的天然或人工裂缝。不同尺度孔隙结构对页岩气流动机理的控制作用不同。为准确获得页岩不同尺度的孔隙结构，非常需要建立页岩三维孔隙结构多尺度表征方法，实现不同分辨率方法来源的统计数据相结合。本项目拟利用不同分辨率的同步辐射微纳米CT和FIB-SEM方法对页岩样品同一区域不同尺度的孔隙结构特征进行逐级表征，界定不同分辨率实验方法的表征单元体，对不同实验方法来源的孔隙度进行归一化，为页岩孔隙三维结构表征提供方法参考。

The pore system of shale is characterized by multiscale coupled flow space, including micro-nano scale pores, micro and larger scale natural or artificial fractures. The pore structures at different scales have different effects on the shale gas flow mechanism. In order to capture three dimensional pore structures at various scales accurately, it’s very necessary to develop a systematic method at various resolutions. In this project, synchron radiation X-ray tomography and FIB-SEM techniques with multiscale resolutions will be used in turn to study multiscale shale pore structures of the same region. The project aims to define the representative elementary volume of different experimental methods and the porosity data got in various scale will be combined and calculated further.