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曲线重叠法是油气地质评价中较常使用的一项测井评价技术,能够通过电阻率测井和声波时差测井数据计算出总有机碳含量,但是在该方法中,两个计算参数电阻率基线值和时差基线值是通过观察测井曲线图上两条测井曲线的“重叠情况”而估算出来的,带有很大的人为性和随意性,从而影响了有机碳含量计算的准确度。为了解决该问题,分析了3个绘图参数(R f、△tf、k值)对测井曲线的形状和位置的影响:当定位参数(R f、△tf)改变时,电阻率曲线的形状不变,但是在横向上产生一个总体平移量;当轴比参数(k值)改变时,电阻率曲线的形状和位置都发生变化。因此证明了轴比参数k值是关键参数,提出了使用岩心分析化验数据和测井数据通过二元线性回归模型拟合获得轴比参数k值的方法。由于避开了原公式中的基线值,新方法提高了有机碳含量计算的准确度。
The curve overlap method is a commonly used logging evaluation technique in oil and gas geological evaluation. It can calculate total organic carbon content through resistivity logging and acoustic time difference logging data. However, in this method, the two calculated parameters of electrical resistivity Baseline and time-lapse baseline values are estimated by observing the “overlap” of two well logs on a well log, with a high degree of humanity and randomness that affects the calculation of organic carbon content Accuracy. In order to solve this problem, the influence of three plotting parameters (R f, Δ tf, k values) on the shape and position of the logging curve is analyzed: when the positioning parameters (R f, Δ tf) are changed, the shape of the resistivity curve It does not change, but produces an overall translational shift in the horizontal direction. When the axial ratio parameter (k value) changes, the shape and position of the resistivity curve change. Therefore, it is proved that the axial ratio parameter k is the key parameter, and a method of obtaining the axial ratio parameter k value by using the core analytical laboratory data and the well logging data through the binary linear regression model fitting is proposed. The new method increases the accuracy of the organic carbon content calculation by avoiding the baseline values in the original formula.