And it is different from water-complately-saturated one at slowly increase manner first with the decreace of water saturation, and increases sharply again when it decreases to an critical value.

• 而完全饱和水的岩心随着残余水饱和度的降低，气体视透率先缓慢增加，当含水饱和度降到一临界值时，视渗透率迅速增加，这是空间增大引起气体的滑脱效应增加所致。