Micro porosity and percolation rules by mercury pressure and seepage experiment of Shengli Oilfield low permeability shale cores. Because of the special characteristics of shale bedding structure, resulting in poor correlation with permeability shale hole. Mercury pressure experiment show that interval shale reservoir capillary radius distribution is low, poor sorting pores smaller, rate of permeability contribution. Because the gas slippage effect, generally in low permeability reservoir is nonlinear. The shale reservoir of low permeability, single-phase flow experiments show that shale has obvious characteristics of non-Darcy flow, starting pressure gradient magnitude and permeability, single-phase flow experiments show that shale has obvious characteristics of non-Darcy flow, starting pressure gradient magnitude and permeability negative correlation significantly.