低渗透非达西流场中溶质运移实验及数值模拟

Experiment and numerical simulation of contaminant transport in non-darcy fluid field through low permeability porous media

为了更好的研究低渗介质中污染物的运移规律,运用低渗岩芯中溶质运移实验,比较了不同启动压力梯度下溶质运移规律及其特征,并应用所建立的数学模型模拟了饱和的低渗岩芯中溶质运移过程。结果表明:不同质地的低渗岩芯,其启动压力梯度不一样,启动压力梯度越大,流速越小,水动力弥散作用对溶质运移的影响更加明显,应用对流扩散方程可以很好的模拟溶质在低渗岩芯中运移的过程。

In order to study the transport law of contaminant in low permeability porous media,the law and character of contaminant transport under different starting pressure gradient (SPG) are compared and the course of contaminant transport in saturated low permeability porous media is simulated applying mathematical model. The results indicate that SPG is different in different texture core and the bigger the SPG is,the lower the seepage velocity is.The influence of hydrodynamic dispersion on contaminant transport is more obvious.From the simulation,we can see that the convective diffusion equation can simulate the course of contaminant transport in low permeability core accurately.