The sufficient bottom water energy and complex rhythmic layer distribution in the lower oil formation reservoir of 9th block of Tahe Oilfield lead to the great difficulties of the conventional numerical simulation technology to characterize the complex bottom water rising regulation and the effect of EOR measures. Taking the lower Triassic oil formation reservoir in 9th block of Tahe Oilfield as an example

the high-precision numerical simulation technology under the background of non up-scaling geological model is introduced. By the early movable water simulation

single diaphragm flow

multiple diaphragm flow and dynamic relative permeability techniques are deployed. Then

the reservoir history matching research is carried out

and the overall production matching degree of the reservoir reaches 95.23 %. At the same time

the high precision numerical simulation technology is used to predict the field rate enhancement and gas injection measures

which is highly consistent with the field production effect. In the process of high-precision numerical simulation

the water breakthrough mode of horizontal well is changed from water ridge in conventional simulation to “water-breakthrough at point” mode. The main controlling factor of flow field is the collaborative control of pressure field and physical parameter field.