深部页岩气储层压力在衰竭过程中势必会产生滑脱效应和有效应力变化，两者对渗透率演化均起着重要影响，有必要探究它们对渗流的作用机理。进行了不同体应力和孔隙压力耦合作用下页岩的变形与渗流试验。研究表明：孔隙压力和地应力对浅部页岩气储层变形作用显著；在深部高应力作用下，页岩已处于致密状态，可压缩性显著降低，孔隙压力对其内部裂隙变形作用可忽略。随着页岩气储层由浅部进入深部，滑脱效应取代有效应力作用主导着页岩气渗流。在低应力和高应力作用下，页岩的渗透率有效应力系数均大于1，分别为2.9和2.95，表明未经实验验证而假定页岩渗透率有效应力系数κ=1是值得商榷的，这对页岩气产量预测会造成重大偏差。由于页岩微孔隙结构的形成与黏土颗粒密切相关，可利用黏土壳模型较好地解释κ＞1的实验现象。利用线性、二次和双滑移Klinkenberg方程对滑脱效应进行修正，发现表观渗透率和孔隙压力之间更符合二次函数关系式。在深部应力环境下，相较储层有效应力变化，随着孔隙压力衰竭，滑脱效应更加明显；滑脱效应在高气体压力下会减弱，滑脱系数呈指数降低。最后，通过确定有效应力影响区最佳κ，得到不同应力阶段的渗透率应力敏感性指数ξ，进而提出了一种量化滑脱效应对表观渗透率贡献的新方法。

Slippage effect and effective stress change are bound to occur in the pressure depletion process of deep shale gas reservoir, both of which play an important role in permeability evolution. It is necessary to investigate their mechanism on seepage. In this paper, the deformation and seepage experiments of shale under the coupling effects of bulk stresses and pore pressures are performed. The results show that pore pressure and in-situ stress have significant effects on the deformation of shallow shale gas reservoirs. The deep high-stress shale is in a compact state, and its compressibility is significantly reduced, which makes the effect of pore pressure on internal fracture deformation can be ignored. As the shale gas reservoir goes from shallow to deep, the slippage effect replaces the effective stress to dominate the shale gas seepage. Under low stress and high stress, the effective stress coefficient κ of shale permeability are both greater than 1, and their values are 2.9 and 2.95, respectively. This indicates that the assumption of κ=1 without experimental verification is questionable, and may cause significant deviation to the prediction of shale gas production. Since the formation of micropore structure of shale is closely related to clay particles, the experimental phenomenon of κ > 1 can be explained by clay-shell model. The linear, quadratic and double-slip Klinkenberg equations are used to correct the slippage effect, and it is found that the relationship between apparent permeability and pore pressure is more consistent with the quadratic function. In the deep high-stress environment, the slippage effect is more obvious with the depletion of pore pressure compared with the change of reservoir effective stress. The slippage coefficient decreases exponentially with pore pressure, and the slippage effect diminishes accordingly at high gas pressure. Finally, by determining the optimal κ in an effective stress domain, the stress sensitivity index of permeability ξ, is obtained at different stress stages, and then a new method to quantify the contribution of slippage effect to apparent permeability is proposed.