With the development of Huabei Oilfield in the middle and late stage, the application of residual oil saturation logging is becoming more and more important in water-flooded layers interpretation and residual oil evaluation. However, the single saturation logging method can not meet the needs of sophisticated interpretation and evaluation. Therefore, two residual oil saturation logging techniques, thermal neutron imaging system (TNIS) logging and pulsed neutron spectrum saturation log (PSSL), have been introduced in Huabei Oilfield in recent years. TNIS and PSSL logging can effectively reflect the change of the residual oil saturation in the reservoir by combining their respective logging principles, technical characteristics, data interpretation methods and conventional logging data, which plays an important role in finding potential layers, identifying low resistivity reservoirs, identifying water-flooded layers, and determining the distribution of residual oil. At the same time, it provides the basis for guiding the interpretation of oil and water layers in complex oil and gas reservoirs, determining the plan of oil testing and increasing oil output, and finally realizing refined interpretation and reservoir evaluation integration.