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储层饱和度测井仪（ＲＳＴ）是斯伦贝谢公司在次生伽马能谱测井仪基础上发展起来的一种新的碳氧比能谱测井仪。采用双探测器探测由中子发生器产生的高能中子以及仪器周围地层介质非弹性散射而产生的伽马能谱。可以评价地层水矿化度多变的水驱油田的剩余油饱和度及其分布；确定储层含油饱和度和井眼持油率；标定地层水电阻率。ＲＳＴ在胜利油田的应用结果表明ＲＳＴ资料比常规碳比测井资料无论在精度、垂向分辨率和测量的动态范围，还是油水界面评价和含油饱和度计算等方面都有所改进。
The Reservoir Saturation Tool (RST) is Schlumberger’s new Cox spectroscopy tool developed on the basis of a secondary Gamma spectrometer tool. A dual detector is used to detect the gamma energy spectrum generated by high energy neutrons generated by a neutron generator and inelastic scattering of formation media around the instrument. The residual oil saturation and its distribution in the water-driven oil field with variable salinity of formation water can be evaluated; the oil saturation of the reservoir and the oil holding rate of the borehole can be determined; and the formation water resistivity can be calibrated. The application of RST in Shengli Oilfield shows that the RST data have improved compared with the conventional carbon ratio logging data in terms of precision, vertical resolution and dynamic range of measurement, oil-water interface evaluation and oil saturation calculation.