Abstract: Based on matrix mineral, diagenetic sequence and fluid inclusions, are tested homotemprature, salinity and fluorescence of inclusions which coexist with hydrocarbon inclusions. The depth and geological age of oil inpouring are ascertained by combining with paleotemperature grad and sedimentary burial history. Inclusion analysis indicates that Fuxin uplift and Changling sag separate away aftermajor reservoir-forming stage of Fuyu oil layer, i.e. oil inpouring and reservoir-forming take place before Fuxin uplift upheaved in great force. The reservoir-forming of Fuyu oil layer includes two stages, i.e.the later Nenjiang period and later Mingshui period in Cretaceous. Inclusion study demonstrates oil reservoir being featured by up-source and down-storage, local-storage and verticalmigration. It is clarified that the source of Fuyu oil layer might originate anciently from Changling sag. Synchronously, it is pointed out that the "sweet point" controlled by source rock, overpressure, fault and sandbody are advantageous regions for oil exploration in the future

Key words: fluid Inclusion, reservoir forming period, reservoir-forming mechanism , oil-gas exploration, Fuxin uplift