碳氧比测井解释的理论模型及应用

对目前的２７２７碳氧比测井仪器，根据元素能窗伽马射线产额，利用胜利油田和大庆油田的刻度井建立了碳氧比测井计数和组成地层的矿物体积之间的关系，提出了新的能窗剥谱解释方法。新的解释软件把套管井资料和裸眼井资料结合起来，利用地层的硅元素，钙元素产额来计算地层的砂岩，灰岩，白云岩矿物体积，利用碳元素，氧元素产额确定地层的含油饱和度，从而对岩性剖面有更深入的了解。

Theoretical Model of C/O Log Interpretation and Its Application

On the basis of element yields in its energy window and the relation between C/O count rate and mineral volume set up with calibration wells in Shengli and Daqing Oilfields, a new spectrum stripping method is proposed in this paper. With the new interpretation software, log data from open and cased holes are combined to determine the volumes of sand, limestone and dolomite with Si and Ca yields and the oil saturation with C and O yields. Thus lithology profile can be better evaluated.