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Based on the summary of a large number of known research achievements the following conclusions can be drawn by the authors�� The deep formation of southern Songliao Basin is characterised by the enrichment of hydrocarbon gas��and the accumulation stage of hydrocarbon gas focusing on the deposition period of the second member of Denglouku Formation and on the late Cretaceous�� The shallow layer of southern Songliao Basin is rich in petroleum��and the accumulation stage of petroleum is mainly from the end of Mingshui Formation to Early Paleogene�� The CO2 mainly accumulated in the third and fourth member of Quantou Formation��and the Yingcheng Formation��in which the reserves of CO2 is large with mantle origin�� The generation of CO2 is related to volcanic activi- ty during the later- stage of late Miocene�� The accumulation periods of shallow and deep formations are earlier than the charging of mantle CO 2 �� The shallow layers have better conditions for the secondary accumulation of petroleum driven by the mantle CO2 charging�� which could be regarded as the favorable targets for re-exploration of conventional petroleum��