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。

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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；

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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.

通过室内填砂管渗流实验，研究了不同粘土类型、不同粘土比例的低渗透岩心在不同流体注入方式下的渗流特性，并根据实验结果分析了其渗流机理。

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