随着油田注水开采进入中后期, 含油饱和度动态监测, 对于掌握剩余油分布、提高原油采收率具有重要作用。PNNPlus是一种饱和度测井新技术, 在利用中子探头进行热中子寿命测井的基础上, 增加两个活化伽马探头, 用以辅助判断地层的含水情况, 但该技术在低孔低渗储层剩余油饱和度监测方面的适应性尚不明确。为此, 本文以鄂尔多斯盆地陇东油田为对象, 开展PNNPlus饱和度测井技术的研究和适应性分析。结果表明: PNNPlus测井结果与完井含油饱和度一致, 其解释结论可准确评价剩余油饱和度, 能够适应陇东油田中-低孔隙储层剩余油饱和度评价; 利用PNNPlus探测地层中氧含量与宏观俘获截面Sigma计算地层含水饱和度, 结合含油饱和度、完井测井资料和地质资料可准确识别和划分水淹层; PNNPlus测井获取的地层孔隙度与完井测井结果偏差为0. 5%, 与完井测井解释的油层、水层含油饱和度匹配较好。 

As oilfield enters middle and late stages of exploitation, the dynamic monitoring of oil saturation has become an essential part for grasping the distribution of remaining oil and improving the crude oil recovery. PNNPlus is a new saturation logging technology that adds two activated gamma probes on the basis of thermal neutron lifetime logging using neutron probes to assist in determining the water content of the reservoir, but its adaptability for residual oil saturation monitoring in low-porosity and low-permeability formation is unclear. Therefore, this paper researches and analyzes the adaptability of PNNPlus saturation logging technology by taking the Longdong Oilfield in the Ordos Basin as the research object. It is shown that: the PNNPlus logging technology is suitable for evaluating the remaining oil saturation of the mediumlow porosity reservoir in the Longdong Oilfield as the PNNPlus logging results are consistent with the oil saturation of completed wells and the interpretation conclusions can accurately evaluate the remaining oil saturation; The water saturation of the formation calculated by the oxygen content in the formation as detected by PNNPlus logging tool and the macro-capture cross-section Sigma, combined with the oil saturation, completion logging data, and geological data, can accurately identify and divide water-flooded layers; The formation porosity obtained from PNNPlus logging deviates from that obtained from completion logging by 0. 5%, but matches well with the oil saturation of the oil layer and water layer obtained from completion logging.