The shallow layer of BI 304 block is taken as a fault-nose formed by stratigraphical inversion at later Liaozhuang Period under function of basinal uplift, it contacted with the large fault of Kaikouyi. According to homogenization temperature of saline inclusion associated with hydrocarbons inclusion, burial history, and thermal history of typical well, we consider that the phase of petroleum accumulation in the Bi 304 block was the later Liaozhuang structural uplift stage. The authors set up the hydrocarbon filling model based on the hydrocarbon accumulation features. The oil sources correlation shows that hydrocarbons sourced from deep source rocks were migrated through large fault into shallow nose structure and accumulated.