Physical property time-varying numerical simulation method and device in water injection development process of medium-high permeability reservoir

The invention provides a physical property time-varying numerical simulation method and device in the water-flooding development process of a medium-high permeability reservoir, and relates to the technical field of oil exploitation, and the method specifically comprises the following steps: dividing an oil reservoir or a reservoir to obtain grid units; obtaining the stratum oil viscosity of the grid units, an oil-water relative permeability curve under different water injection scouring multiples and the conductivity between adjacent grid units under the same time step to establish an oil reservoir simulation model; on the basis of an oil reservoir simulation model, the water injection multiple of the grid units is obtained, and on the basis of the water injection multiple of the grid units, a grid unit permeability curve, a stratum oil viscosity curve and an oil-water relative permeability curve are obtained. By means of the method and device, the reservoir physical property change caused by long-term water