小波分析在高分辨率层序地层研究中的应用

为了研究测井曲线小波变换用于高分辨率层序地层研究的方法效果,从小波系数模极值点、过零点与信 号突变点数学关系出发,分析高分辨率层序地层研究对测井曲线划分不同级别层序的要求,探讨了测井小波变 换最佳分解级次和适于测井曲线分层的小波函数选择,以一取心率高钻孔为例,用2种小波函数对4种测井曲 线进行小波变换和高分辨率地层界面解译。研究表明,选择恰当窗宽小波函数决定测井曲线小波分层精度,测 井数据sym6小波分解的小层界面划分效果要稍好于db4小波;GR、RT曲线正则性小波分解可以很好地满足 高分辨率层序地层划分要求;测井曲线小波分层结果与岩心分析结果一致性好。

Application of Wavelet Analysis in High Resolution Sequence Analysis

For the purpose of studying the method and effect of logging curves wavelet transform in high-resolu- tion sequence research, this paper analyzes the demand for high resolution sequence study according to the logging curves in different gradation sequences demarcation, researches the optimum decomposition gradation of wavelet transform in logging curve and the choosing of optimum wavelet function. Taking a hole in Ordos basin which is a good coring hole as an example, it makes the wavelet transform on four curves with two wavelet function. The study indicates that optimum windows width determines the layering precision, interface partition with sym 6 wavelet is better than with db4. It also show that canonical wavelet decomposition of GR and RT satisfies the de- mand, and layering with wavelet correlate well with core analysis.