ABSTRACT
In order to study the change law of physical properties of the fracture-flooding reservoir, this paper takes the Class III Reservoirs of Daqing Oil as an example, and uses the natural core of closed coring well to explore the change laws of reservoir porosity, permeability and pore structure before and after fracture-flooding measures by means of conventional mercury injection experiment, constant velocity mercury injection experiment and scanning electron microscope. The results show that the physical properties of the pore structure of the reservoir become better after pressure flooding, the permeability increases, the number of connected pores and throats increases, the size of the pores becomes larger, and the formation of large pores and the flow resistance decreases.
