Abstract: The Fulin subΟsag suffered two rift cycle stage from ShaΟ4 segment to ShaΟ2 segment andfrom ShaΟ1 segment to Dongying segment and segment and downwarp stage from Guantao segment to Quaternary, and the Tertiary development four types depositional system. This subΟsag’s area is small , and ShaΟ3 segment hydrocarbon source rock buried shallow , mature later
and quantityof generated hydrocarbon isfiniteness, the difficult degree of explorationfor oil and gasis hard. Through dissecting the forming procedure of oil field that had been discovered, combining the sun sag’s structural history, depositional histo ry, organic matter thermal evolutional history, oil and gas run ning history and reservoir forming history together tightly,finding the configration relation of oil and gas’s producing and running with the trap’s producing and developing on sapace time , more ,the reservoir’sforming condition and collecting rule is summarized and the next direction of exploration is pointed out.

Key words: Fulin sub sag, reservoir formation, distributing rule