Understanding pore characteristics is vital for assessing storage capacity and flow mechanisms in shale. These characteristics encompass pore size distribution, type, geometry, network, porosity, total pore volume, specific surface area, and other factors. The micro and mesopore geometry and associated pore networks in shale are extremely intricate and heterogeneous. The pore network consists of interconnected voids, pores, and natural fractures with complex and irregular shapes. At the nanoscale, the intricate network and geometry of pores in shale, combined with very low connected porosity and permeability, govern fluid storage and migration in the reservoir.