Abstract
In order to describe the complicated seepage flow process of tracer in porous medium, in view of the seepage flow mechanism and migration feature of the tracer with microcosmic porous channel level, the microscopic visualization experiment of tracer in porous medium is designed by using microscopic model of pore structure, and the micro porous media mass transfer diffusion process and mechanism are observed directly. The experiment results show that, for tracer migration, there is the flow around effect with different size on a microscopic level. Along with the advance of tracer in porous media, the flow around size is increased. With the tracer forward, the concentration gradient of concentration front is decreased because the mixing action is obvious, front is no longer regular, and horizontal width is increased obviously. During the modeling process of tracer test interpretation, the mixing effect, micro circuitous degree and network structure with multiple channels and the flow around effect between small scale and large scale must be comprehensively considered.
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