测井曲线的自动深度校正

测井曲线间的深度误差几乎是不可避免的。依据测井曲线间的某些相关性,利用计算机可以实现测井曲线自动深度校正。文中采用相关分析、频率分析与动态规划相结合对测井曲线进行深度校正,即先用相关分析法找出对比曲线与标准曲线间的深度对(即深度位移量);然后用频率分析法对已找出的深度对进行筛选;再用动态规划法对筛选后的深度对分类,以其中最优的作为深度校正的深度对;最后根据确定出的深度对,将对比曲线相对于标准曲线作相对位移,便可将一口井的各测井曲线的深度对齐.利用由该方法编制的深度校正程序,对实际测井曲线进行自动深度校正的试算表明,可获得较好的结果。

Automatic Depth Correction of Logs

There are always any depth errors in log data. The automatic depth correction of logs may be made by some correlations of logs on computer. A technique combining correlation, frequent analysis and dynamic programming methods used to correct the depth shifts of logs is presented in this paper. The depth shifts (called also depth pairs) of logs to be correlated and standard log (whose depth is considered as a corrected depth) are determined first by using the correlation method. Then the depth shifts obtained are screened to delete any unreasonable depth from them. Finally, the depth shifts screened are classified by the dynamic programming method. The best depth pair optimized among them is selected as that satisfying depth correction. Satisfactory results can be obtained from correcting automatically real logs with a prorgramm composed by this technique.