After years of water injection development, various oil layers in Daqing Oilfield have been flooded to varying degrees, and the adjustment and tapping targets have gradually shifted towards thin and poor reservoirs. The resistivity of reservoirs with thin interbedded characteristics is greatly affected by surrounding rocks and cannot be accurately identified. This article uses the method of quantiles in histograms to extract high-resolution resistivity curves, improving the traditional segmented linear calibration method by scaling point by point according to depth, thereby improving the resolution of thin layers. By improving the Archie formula and using high-resolution resistivity curves to calculate oil saturation, the results showed a high degree of consistency between using this method to calculate saturation and core analysis saturation. The application of the results to the identification of thin interbedded reservoirs in the Fuyu oil layer of Daqing Oilfield greatly improves the accuracy of thin interbedded reservoir identification and provides strong technical support for increasing oil reserves and production in the oilfield.