Impermeable clay limits downward percolation of water and fulvic acids, reducing chemical weathering and podzolization.
不可渗透的粘土限制了水和黄腐酸的向下渗透，从而减少了化学风化和土壤灰化作用。
2
The study shows that the swelling clay is the key factor that affects considerably the percolation feature of low permeability reservoir.
分析认为，膨胀性粘土的存在是影响低渗透油藏渗流特性的关键因素；
3
Using the sand pack model, the percolation features of low permeability cores with various clay minerals and different proportions of clays are studied under different fluid injection patterns.