The Results shows that the oil displacement efficiency is mainly affected by pore structure, macro heterogeneity, oil viscosity and technology policy of water flooding.

The mixed styles in a single discourse are characterized by heterogeneity between generic structures on the macro and micro scales.

The crevasse and point bars are of intermediate heterogeneity. Conclusion Inlayer macro heterogeneity is intermediate, the interlayer and horizontal macro heterogeneity are relatively strong;