Abstract: The sandstone reservoir of Funing formation in the seventh block of Gaoji oilfield is of high heterogeneity, which controls the distribution of remaining oil and influences the effect of development. In the plane, a zone with high remaining oil saturation was formed in the sand edge of the non-major facies, top position of the formation. In vertical section, non-major reservoir sandstone is restricted and distributed as the lens. The porosity and permeability are low, and the thickness of oil reservoir is small. Although its remaining petroleum is not abundant, saturation is higher than others. The major models for inlayer heterogeneity are positive rhythm and complex positive rhythm. The top of the reservoir with the positive rhythm and the top and bottom of the reservoir with the complex positive rhythm contain abundant remaining oil, which supplies reliable geology foundation and points to the dominant adjustment direction.