Abstract: The wild field investigation and the systematic sample collection were conducted, and the collected samples were experimentally tested using SEM, mercury injection, nitrogen and carbon dioxide adsorption. The results show that the target zone is dominated by intercrystal pore, intergranular pore, corrosion pore and microcrack, with pore size of1~10μm, a few reaching10~20μm measured by SEM;5~800nm for major pore size by mercury injection, and that of larger than5nm accounts for over90%, the specific surface area and pore volume of2.12m2/g and 0.0128mL/g, respectively, and porosity of2.78%; for low-temperature liquefied nitrogen and carbon dioxide adsorption tests, their specific surface areas average12.8m2/g and8.78m2/g, pore volumes are0.0112mL/g and0.0025mL/g, pore sizes are4.67nm and0.495nm, respectively. It is concluded that the pore system of the target is more developed and connected, with higher porosity, larger specific surface area and pore volume, favorable for adsorption, migration and accumulation of shale gas as a good quality of reservoir