The selection of rock resistivity parameters in Archie formula is important during the logging interpretation of oil saturation. However，the influence of the oil and water occurrence mode in reservoirs is rarely considered. The oil and water occurrence mode in shallow unconsolidated sandstone heavy oil reservoirs is different from that in the conventional oil reservoirs. The pore water in the form of“isolated water droplets”is separated by oil，which makes it difficult to form a conductive network. As a result，the oil saturation of heavy oil reservoirs interpreted by Archie formula is higher than the actual one. Therefore，it is necessary to optimize and correct the saturation interpreted by logging data.In this study，the heavy oil reservoir of Guantao Formation in Zhanhua Sag，Jiyang Depression is selected as the research target to illustrate that the main factor influencing the occurrence of“isolated water droplets”in pore is the pore structure. And then the oil saturation analyzed by oil-based mud core is taken as the standard，the correction amount of the initial interpretation value is calculated to be 4.1%-5.4% with an average of 5% by the methods of experimental analysis and equation interpretation，such as CT scans，Archie formula，oil height and capillary pressure，and water cut equation. The results provide a basis for the interpretation and correction of the oil saturation in heavy oil reservoir，and provide a method for the oil saturation correction of shallow unconsolidated sandstone heavy oil reservoirs.