Since the parameters obtained from saturated hydrocarbon mud logging technology are not affected by formation water salinity and reservoir heterogeneity, it can be more intuitive and accurate in determining watered-out degree of oil zones. G area in Jiangsu oilfield has stepped into a high water cut stage under years of water flood development, so the evaluation of water flooded zones has become more and more important. Based on the analysis of saturated hydrocarbon parameters of 28 core samples of different water production rate obtained from oil-water displacement experiment, the analysis shows that saturated hydrocarbon peak shapes change from normal to flat, and saturated hydrocarbon total area A_s decreases, and the parameters of C_Pr+Ph and C_Pr /C_nc17  increase with the increase of water production rate. Based on the experimental analysis, the parameters of C_Pr+Ph , C_Pr /C_nc17 and saturated hydrocarbon total area are selected as the sensitive parameters of water-flooded zones in G area. Then, sidewall cores of oil testing wells and brought-in wells are used to build qualitative identification charts of water flooded zones with the plot of C_Pr /C_nc17 versus total area and the plot of C_Pr+Ph versus total area. The identification charts are applied to actual well data, and the identification results are consistent with the test results.