测井信号小波分析在高分辨率层序地层划分中的应用

Application of wavelet analysis to sequence stratigraphic division of high resolution sequence stratigraphy

阐明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.通过对测井信号小波多尺度的分解,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,选取合适的尺度因子可进行地层层序划分.按照该步骤,对鄂尔多斯盆地安边地区A16井自然伽马信号做小波变换分析,并依GR曲线的小波分析划分层序.划分结果证明,小波变换适用于中期及其以下级别旋回层序的划分,可提高旋回层序的划分精度与储层评价、预测精度.

The definition of wavelet analysis was introduced and the applicability of the logging data wavelet analysis by means of the high resolution sequence stratigraphy stratum was discussed.We gained various rank gyre cycles by wavelet analysis of the decomposition of the logging data.Corresponding to the various level sequence interfaces which was demarcated by bore lithofacies,we selected seemly scale to plot stratum sequence.According to the steps,we analyzed the A16 well GR signal of Erduosi base Anbian area by wavelet transform.The plot result proved that it is very suitable to plot the metaphase and subordinate gyre sequence.The method can improve the precision of plot gyre sequence,reservoir estimation and forecast.