一种地震子波提取的高阶累积量方法  

A High-Order Cumulant Method for Seismic Wavelet Extraction

作　　者：曹艳玲[1] 王修田[1] 

机构地区：[1]海洋地球科学学院海洋地球科学学院

出　　处：《中国海洋大学学报（自然科学版）》2008年第3期461-467,共7页Periodical of Ocean University of China

基　　金：国家高技术研究发展计划项目(2006AA09Z358)资助

摘　　要：提出1种在频率域实现地震子波提取的高阶累积量方法。其是先提取子波的相位谱再求解时间域的子波。理论上可适用于提取除零相位子波以外的任何形式的子波,但应用不同长度的时窗提取子波的效果会有很大的差别,实际应用时可利用时窗长度扫描的方法,以不同的子波相位谱对地震记录进行子波零相位化处理,最后根据最大方差模准则确定最佳子波。理论模型实验和实际资料处理实验均表明了该方法对最小相位及混合相位子波都有较好的处理效果。In this paper, a new frequency domain method of high-order cumulants is presented. It first computes the phase spectrum and then obtains the solution of wavelet in the time domain. Theoretically the approach is capable of extracting almost all kinds of wavelets except zero-phase ones. High-order cumulants belong to statistical methods and need to be calculated in different time windows. It is found that the length of the time window may seriously affect the accuracy of the result, and it is proposed that this problem may be overcome in practice by scanning the length of the time window. The optimum wavelet is finally evaluated based on the varimax criterion for a zero-phasing seismic record or section. Numerical and real data tests demonstrate that the method presented is capable of both minimum and mix-phase wavelets with relatively higher accuracy.

关 键 词：高阶累积量 子波提取 相位谱 子波零相位化 

分 类 号：P631.443[天文地球—地质矿产勘探]