Abstract:

According to oil-source rock correlation,there are two petroleum systems in Nanpu Depression.One is Shahejie Formation petroleum system,the other one is Dongying Formation petroleum system.The source rocks of Sha-3 member of the first system began oil generation in the late stage of Dongiyng Formation,and formed self generation self reservoiring oil pools;the source rocks of the system began secondary oil generation in late Minghuazhen Formation,and formed Tertiary secondary oil pools.As for the second system,the source rocks of the third member of Dongying Formation in the south side of Gaoliu Fault started oil generation in the late stage of Minghuazhen Formation,and formed self generation self reservoiring oil pools of Dongiyng Formation and Tertiary secondary oil pools,but no hydrocarbon pools could be found in the north side of the faults.So it is suggested that hydrocarbon exploration should aimed at the petroleum system of Shahejie Formation in Gaoshangpu and Liuzan areas of the sag,and the Dongying Formation petroleum system in Beipu and Laoyemiao areas.

Key words: petroleum system, critical moment, hydrocarbon pool, Nanpu Sag