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近三十年来,在套管井外的淡水地层中直接找油和观察油层动态,一直是测井工作者的研究课题之一。特别是在注水开发技术被普遍采用之后,这项研究任务显得更为重要。碳/氧(C/O)比测井方法是在低矿化度、高孔隙度(≥20%)地层的套管井中用来探测油层、水层、油水含量及岩性的一种新的脉冲中子测井方法。它的最突出优点是能穿透钢管、水泥环,从而直接探测地层元素,其测值与地层水的矿化度和泥质含量无关。
In recent thirty years, looking for oil directly in the freshwater caves outside the cased hole and observing the dynamic of the oil layer has been one of the research topics of the well logging workers. This research task becomes even more important, especially after waterflooding technology is widely adopted. C / O ratio logging is a new method used to detect oil, water, oil-water content and lithology in cased wells with low-salinity, high porosity (≥20%) formations Pulsed neutron logging method. Its most prominent advantage is the ability to penetrate the steel pipe, cement ring, which directly detect the formation elements, the measured value and formation water salinity and mud content has nothing to do.