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在深入分析天然气通过盖层扩散作用及其影响因素的基础上，对泥质岩盖层封闭扩散相天然气作用及影响因素进行了分析，提出泥质岩盖层对扩散相天然气的3种封闭作用，即依靠浓度的封闭作用、依靠浓度和自身品质的封闭作用和依靠自身品质的封闭作用。并根据气藏与盖层之间含气浓度差、天然气通过盖层扩散系数和厚度，通过对气藏与泥质岩盖层之间含气浓度差、泥质岩盖层扩散速度和单位浓度差下的天然气通过盖层扩散速度的计算，探讨了泥质岩盖层对扩散相天然气3种封闭能力的研究方法。实例应用结果表明这些研究方法是可行的，可以客观地反映泥质岩盖层的实际封闭能力。
Based on the in-depth analysis of natural gas diffusion through caprock and its influencing factors, this paper analyzes the role of natural gas in the caprock of diffuse phase of mudstone and its influencing factors, and proposes three kinds of sealing action of mudstone caprock on natural gas in diffusive phase , That is, to rely on the concentration of the closed role, relying on the concentration and quality of its own closed role and the quality of its own closed role. Based on the difference of gas concentration between gas reservoir and cap rock, the diffusion coefficient and thickness of natural gas through caprock, the gas concentration difference between gas reservoir and argillaceous caprock, diffusion rate of argillaceous caprock and unit concentration Through the calculation of the diffusion rate of caprock, the study method of the caprock on the three kinds of sealing ability of natural gas in diffusive phase was discussed. The results of application examples show that these methods are feasible and can objectively reflect the actual sealing ability of shale caprock.