Abstract: A two-dimensional, transparent micromodel was prepared according to a micrograph of thin section of a reservoir rock sample by means of the photochemical etching technique. The micromodels exhibts the main features of the pore stucture in an actual reservoir rock. The wettability of this model can be regulated optionaly from strongly water-wet to strongly oil-wet. The roughness of the pore surfaces can be controlled also. The micromodel also can be washed and renewed for subsequent use. The micromodel is used to study the mechanism of oil displacement in second and tertiary oil recovery process and these can be observed visually. The formation of the residual oil and their distribution are studied accordingly A video recording of related phenomena has been carried out and the results of laboratory stu-ies are presented and discussed.