Abstract: Shale pore connectivity directly affects the migration of oil and gas in a reservoir， thus influencing the level of difficulty in shale gas production. It is an important consideration in the evaluation of exploration and development potential of shale gas. Samples from two key wells （JYA and JYB） in the Jiaoshiba area of the Sichuan Basin were tested by helium porosity of plunger samples and nuclear magnetic resonance （NMR） saturated brine porosity to determine the pore connectivity of shale in the reservoir； the influence of pore connectivity on shale gas development is discussed. The results show that the helium expansion method mainly identifies the connected pores in the shale， while the NMR test reflects the overall pore space of the sample. Thus， the ratio of helium porosity to NMR porosity quantitatively characterizes pore connectivity. Only a small difference was found between helium porosity and NMR porosity in well JYA， and they both have a strong positive correlation， suggesting that the pores are mainly connected （69.13%-94.94%， average 85.12%）. Conversely， the pore connectivity of shale samples from well JYB was relatively poor （about 36.15%-81.71%， average 58.19%）. Therefore， the proportion of connected pores does not fully reflect the true porosity of these samples， and no obvious linear relationship was evident in either the helium porosity or the NMR porosity. These findings were confirmed by nano-computed tomography （nano-CT） and pulse permeability difference tests.