测井数据小波变换及其地质意义

Wavelet Transform of Logging Data and Its Geological Significance

论述了小波变换在进行信号时频分析中的优势 ,介绍了连续小波变换的定义和步骤 .以济阳坳陷某钻井为例 ,对迄今为止所能获得的分辨率最高、连续性最好的测井地质数据进行了连续小波变换 .结果显示原始测井信号经过小波变换后能清楚地将不同时间 (深度 )尺度的旋回展现出来 ,并探测到了地层序列中三种不同级别的突变点或突变区域 .这些认识对识别地层中的天文周期、定量描述地质过程。

Advantage of wavelet transform in time frequency analysis was expounded and the definition and steps of wavelet transform was introduced. The well logging data from a well in Jiyang sag were processed through continuous wavelet transform for case study. The result shows that the curve transformed from original logging signal can clearly reveal the geological cycles on different scales, and three different levels of mutation sections or points in the bed succession have been detected, which is of important significance in recognizing the celestial cycle preserved in strata, quantitatively describing the geological process and solving the basic geological problems of sedimentation rate and stratigraphic completeness.