Many faulted Mesozoic basins have been defined in northeast China. During the late Early Cretaceous the huge depressed basins were formed. These faulted and depressed basins are located in three areas,Songliao, north Liaoning and west Liaoning. Corresponding with the basin type, the petroleum deposits range between the oil and gas. In Songliao Basin, the faulted basin contains gas, and depressed basin has oil. In north Liaoning area, the faulted basin stores gas, but the depressed basin doesn’t contain oil. In west Liaoning area, there is no petroleum deposit in the faulted basin at all. The authors note that petroleum depositions are related to basin type. Furthermore, the basin formation and developmental processes are controlled by the basin geodynamic system. Base upon the geo science study in the south Songliao Basin, north and west Liaoning areas, this article discusses a few issues of geodynamic system.
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