Abstract: In order to study dynamic hydrocarbon accumulation in fault?block sandstone reservoirs, related simulation experiments are carried out on the differences of filtration capacities between oil and water and the impact of hydrodynamic conditions on oil enrichment during the dynamic oil accumulation. The result shows that significant difference exists in oil and water filtration capacities, oil filtration capacity is lower than that of water, which results in the oil accumulation in cores and then the dynamic oil enrichment in permeable media; oil enrichment is constrained by hydrodynamic conditions during hydrocarbon charging, and the stronger the hydrodynamic force is, the easier the oil enrichment will be, and the higher the enrichment degree will be, too. It is assumed that appropriate?open reservoirs sheltered by normal faults are in accordance with the dynamic reservoir accumulation patterns and the application of the dynamic model could macroscopically explain the relationships among the effectiveness of fault sheltering, complicated physical property distribution of fault block reservoirs, accumulation of fault?sheltered reservoirs and hydrocarbon generation setting in the basin and so on