基于小波变换的测井多尺度分层研究

Demarcation of stratigraphy using multi-scale well logging based on wavelet transform

测井信号是岩性、地层微观结构、含流体性等各种信息的总和,测井数据是反映地质体地质信息的载体,地层变化主要体现在测井信号的突变点或突变区域中。以某测井的自然伽马曲线为例,提出应用零通小波、模极大值对测井曲线多尺度分析,在不同尺度上定量划分出不同级别的地层界面,分析结果与实际地层界面一致。小波分析为地层的定量划分提供了一种新的思路。

The logging signal is the summation of lithology, stratigraphic structure, fluid properties, and other information.The well logging curve contains the geological information of geological bodies, and changes in formation are reflected insharp or gradational boundaries between different logging signals. Taking the gamma ray curve of a well log as an example,this paper presents a multi-scale analysis of the logging curve applying a zero-crossing wavelet and modulus maxima.Quantitative classifications of different stratigraphic interfaces are made at different scales, and the results are consistentwith the actual boundaries of the formations. Wavelet analysis constitutes a new method for quantitative stratigraphicdemarcation.