Micro scale porous structure is manufactured through plasma reaction method. The inversed fluorescence microscope is utilized to track and analysis two-phase interface, with deionized water and dodecane designed as wetting phase and non-wetting phase fluid respectively. The reliability of the experimental system is verified and various profiles such as fluid bridge, cone-shaped droplet and fluid film are observed lying on the surface of porous media during the two-phase displacement process. The results showthat:during the drainage process, the saturation of dodecane will increase when the value of Capillary number climbs up. Deionized water tended to occupy the pore throats with smaller size while dodecane is more inclined to take up larger pores. In contrast, during the imbibition progress, the dominant migration pathways are usually distributed at the side wall areas of the micro scale porous structure, which are conducive for the fluid to break though and reach a stable distribution of the two phases. Dodecane stuck to the surface of the porous structure shaped like a cone. Thus, the presence of the cone-shaped droplets are related to the initial saturation phase.
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