Controlling factors for petroleum dominant lateral migration along Eogene carrier beds in southern slope of Dongying sag

Key words:  carrier bed  driving mechanism  lateral migration  controlling factor  Dongying sag

Abstract:

Many analytical data such as drilling, logging, formation water testing and petroleum geochemical property were used to analyze the carrier beds and fluid kinetics of Eogene in the southern slope, Dongying sag. Controlling factors of petroleum dominant migration along carrier beds were studied under different driving mechanism. The results show that there are three kinds of driving mechanisms including buoyancy，hydrodynamic force and fluid overpressure in the area. The buoyancy drives petroleum migration in the shallow,middle carrier beds, and positive structural elements control dominant migration pathways. In the overpressure zone, active faults induce overpressure fluid to dominantly migrate towards faults. In the deep carrier beds with low permeability and normal formation pressure, both hydrodynamic force and buoyancy interactively drive petroleum to migrate. Petroleum dominant migration pathways are mainly controlled by positive structural elements，but simultaneously affected by heterogeneous permeability of carrier beds.