RESERVOIR FORMING MECHANISM OF LIANGJIALOU OILFIELD, THE DONGYING DEPRESSION

Effective source rock, passage system and infilling time are the chief study content of reservoir forming mechanism. Based on the conclusions of source rock contrast, passage system analysis, and reservoir infilling (history), it is pointed out that, effective source rock of the upper Es⁴ and middle-lower Es³ members is connected with reservoir of the upper Es³ member through growth faults, therefore faults play an important role in the passage system of Liangjialou oilfield. The main migration forces are seismic pumping caused by growth fault activities, and abnormal liquid overpressure caused by mudstone undercompaction and hydrocarbon generation. There is correspondent relation between the histories of fault activity and reservoir infilling. The mechanism of reservoir forming could be described as the episodic migration and infilling dominated by episodic fault activities.