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盖层的存在是天然气成藏和保存的必要条件之一，而浓度封闭又是盖层的一种重要的封闭机理。在前人工作的基础上，研究了浓度封闭的机理，进一步系统建立了天然气扩散的地质和数学模型，并给出了模型的初始化条件，对天然气扩散量的计算方法作了讨论。
The existence of cap rocks is one of the necessary conditions for gas accumulation and preservation, and the concentration closure is an important sealing mechanism of cap rocks. Based on the previous work, the mechanism of concentration closure was studied. The geological and mathematical model of natural gas diffusion was further established. The initial conditions of the model were given and the calculation method of natural gas diffusion was discussed.