剩余油饱和度的测井评价方法

 目前能够过套管测量剩余油饱和度的方法主要有过套管电阻率测井、碳氧比测井、中子寿命测井、中子伽马注钆测-渗-测、脉冲中子-中子测井（PNN）等。综述了套后剩余油饱和度的测井评价方法，分析了各种方法的测量原理、技术应用、适用性及实例，总结了目前应用较为广泛的剩余油饱和度测井评价方法。

Well Logging Residual Oil Saturation Evaluation Methods

The major logging methods employed to investigate the residual oil saturation in the cased hole include through-casing resistivity logging, carbon-oxygen ratio logging, neutral lifetime logging, neutral GR logging by injecting gadolinium into the reservoir and pulsed neutral-neutral logging (PNN). These residual oil saturation logging methods are reviewed in this paper, with the focus on their interpretation of field data, covering the working principle, geological applications and the technical capability of these methods. The latest developed through-casing resistivity logging tool by Russia, named as ECOS, enjoys many technical advantages in residual oil saturation calculation, hydrocarbon leakage zone evaluation, and reservoir management determination. As a relative mature technique, the carbon-oxygen ratio logging could be employed to calculate the oil saturation and the water salinity and to investigate the water flooded zones, as is more suitable for studies in the formation with low salinity and large saturation. The neutral lifetime logging is one of the most important methods to determine the residual oil saturation, but it is valuable just for perforated zones with medium or low salinity. Comparatively, the method of the neutral GR logging by injecting gadolinium into the reservoir is more useful for studies in the formation with low salinity.