Abstract: When regional tectonic framework changed as a result of tectonic move-ment or tectonic topography varied due to faulting, the original reservoir was destroyed and oil(gas ) remigrated along regional unconformity or fault towards the low-potential-en-ergy direction, and accumulated to form the reservoir in suitable trap. Because of poly-cyclic evolution of petroliferous basins in China, it is very clear that oil and gas remigrated and reaccumulated. Attention to this phenomenon is of theoretical and practical impor-tance, which should be combined with the analysis of thermal evolution history of source rock, and tectonic and sedimentary history to determine the distribution of source rock ,source-reservoir-cap assemblage type, and reconstruct the tectonic framework and topog-raphy in each period, thereby determining the direction of remigration and of reaccumula-tion, guiding oil and gas exploration.

Key words: Reservoir, Oil and gas distribution, Oil and gas migration, Oil and gas accumulation