小波分析在高分辨率层序地层划分中的应用

APPLICATION OF WAVELET ANALYSIS IN HIGH-RESOLUTION SEQUENCE STRATIGRAPHIC DIVISION

介绍了小波分析的基本原理和步骤,探讨了测井信号小波分析在高分辨率层序地层划分中的适用性及其意义。对测井信号进行小波多尺度分解后可获得不同级次的旋回周期,将钻井岩相标定的各个级别旋回层序界面与测井信号小波旋回周期对应,然后选取合适的尺度进行地层层序划分。划分结果证明小波变换非常适合中期及其以下级别旋回层序的划分。该方法对提高旋回层序的划分精度与储层评价、预测精度具有重要的意义。

The author introduces the basic principle and procedure of wavelet analysis and discusses the applicability of the log signal wavelet analysis in the high-resolution sequence stratigraphic division. The cycles of various orders may be obtained after multi-scale wavelet resolution of log signals. He made the cyclic sequence boundaries of various orders determined by lithofacies in the borehole correspond to the wavelet cycles of log signals and then selected appropriate scales for determining stratigraphic sequences. The results indicate that wavelet transform is very suitable to the division of cyclic sequences of intermediate order and smaller orders. The method has great significance for the improvement of the precision of cyclic sequence division, reservoir evaluation and prediction of the precision.