Underwent 40 years' exploration and development history,the composite oil_gas accumulation zones in Bohai Bay Basin have come into mature stage.But the complicated characters of petroleum distribution in Bohai Bay Basin still show a further foreground to discover more potential resources.The exploration precision of petroleum system with the source rock as Tertiary should be improved,and also more attentions must be paid to the other petroleum system with the source rock as Mesozoic,Paleozoic and Mid_Upper ...