Abstract:

The Cenozoic faulted basins in eastern China are located in the relatively thinning area of platform lithosphere,where the regional uplifting of upper mantle and the present depression just like the inverted reflection in water. The thermal energy at depth can be transmitted upward to the upper crust through changes of crust and mantle properties and magmatic intrusion,which would resulted in a relatively high geothermal field during the fault-subsidence period.The high geothermal field during fault-subsidence and further deeply buried in depression stage would cause the source rocks to be in their hydrocarbon-generating stage.The changes of major fault system's active center and intensity would directly affect the variations of sag's subsidence and depocenter,which would also result in the variations of hydrocarbon generation.As for Subei basin,the relatively high resources abundance in the basin has resulted from the high sedimentation and subsidence rates of Bohai Bay basin in post-Oligocene.

Key words: fault depression, subsag transformation, major fault, multiple stages, transport