目前,在对我国主要大中型气田盖层的岩性、厚度等宏观参数统计分析与排替压力、扩散系数等微观参数的实验分析基础上,对我国大中型气田盖层分布进行定性和定量研究,认为我国大中型气田盖层分布具有如下特征:①大中型气田盖层以泥岩为主,膏盐岩次之。②大中型 At present, on the basis of the statistical analysis of macroscopic parameters such as lithology and thickness, the pressure and diffusion coefficient of lithology and thickness in the major gas fields in China, the distribution of caprock in large and medium-sized gas fields in China is studied qualitatively and quantitatively , That cap rock distribution in China has the following characteristics: ① large and medium-sized gas cap rock mudstone-based, gypsum salt rock second. ② large and medium-sized