The peripheral oil fields of Daqing Changyuan have a comprehensive water content of 77.53%, and the main developed blocks have entered a high water content development stage, with complex distribution of remaining oil. The scale of oil control geological bodies is becoming smaller and smaller, with severe water flooding in the main layer, mainly residual oil within the layer, interference between non main layers, and poor utilization. Conventional geological modeling and reservoir numerical simulation based on sedimentary units cannot meet the demand for precise injection and production adjustment and tapping of remaining oil. On the basis of fine characterization of single sand bodies, a high-precision modeling based on interlayers and rhythms—numerical modeling residual oil characterization technology is established. The interlayers are accurately characterized by outcrop and core interlayering patterns, logging curve response characteristics, and geostatistical methods to determine the interlayering shape. A vertical 0.125 m grid fine model is established. Based on the geological and development differences of different well areas, a combination of “virtual wells + permeability zones + flow zones” is used to carry out high-precision numerical simulation without coarsening. Compared with conventional residual oil models based on sedimentary units, the single well fitting compliance rate is increased by 12.7% points, accurately describing the control effect of rhythm and interlayers on fluids in the layer, and achieving a high water cut development period in narrow river channels. The precise characterization of remaining oil indicates the precise direction of water flooding for tapping potential, which is of great significance for stabilizing oil and controlling water in the peripheral oil fields of Daqing Changyuan and for precise tapping potential through water flooding.