Large bottom water sand filling simulation device and oil-water saturation construction method thereof

The invention discloses a large bottom water sand filling simulation device which comprises a sand filling model, the sand filling model comprises a plurality of different-permeability heterogeneous reservoirs which are stacked in sequence and arranged in the horizontal direction, the large bottom water sand filling simulation device further comprises at least one horizontal interlayer, and the horizontal interlayer is arranged between every two adjacent different-permeability heterogeneous reservoirs in a clamped mode. A simulation well pipe filling cavity is arranged in the sand-packed model and used for inserting a simulation well pipe, the water injection system is further included, the water outlet end of the water injection system is communicated to heterogeneous reservoirs, located on the lowest layer, of the sand-packed model and different in permeability, and a plurality of resistivity probes are further arranged in the sand-packed model. The characteristics of the heterogeneous reservoir with strong