A new technique was developed to visualize fluid movement and rock/fluid interaction in the pores of reservoir rocks. It consists of fabricating micromodels containing rock slabs of 3 millimeter thickness and using sensitive image acquisition, recording, and enhancement systems to perform time-and-motion analyses of high-speed events. Displacement experiments were performed using these rock-slab micromodels and two other types of micromodels: an etched-glass network model (HEG) and a chemically consolidated grain-packed (cryolite) model. The tests included several cycles of imbibition and drainage. Comprehensive steady-state tests were also performed in the two simplified (HEG and cryolite) models, which included two-phase and three-phase flows with gas/water, oil/water, and gas/oil/water systems. The results were compared to understand the scope and limitations of these micromodel techniques. 24 refs., 8 figs.