Method for determining water driving equilibrium displacement through tracer technology

The invention provides a method for determining water driving equilibrium displacement through a tracer technology. The method for determining water driving equilibrium displacement through the tracer technology comprises the following steps: step 1, filling a geologic model with water and adding a tracer into the geologic model, so as to obtain different oil-water interwell communication values; step 2, calculating a displacement breakthrough coefficient through the oil-water interwell communication values; step 3, obtaining a displacement breakthrough coefficient threshold value for judging whether the displacement is equilibriumm or not through analysis of oil-water interwell surplus oil; and step 4, judging whether all well groups reach displacement equilibrium or not according to the displacement breakthrough coefficient and by combining with the displacement breakthrough coefficient threshold value, so as to provide a basis for offshore vectorization allocation and injection allocation. The method for determining water driving equilibrium displacement through the tracer technology is clear in thought, simple and convenient in application and provides a technical support for greatly increasing the recovery ratio of offshore oilfields in middle and high water periods.