混合相位地震子波提取及应用

Mixed-phase seismic wavelet extraction and its application

(1.中国石油化工股份有限公司胜利油田分公司物探研究院,山东东营257022；2.中国石油化工股份有限公司胜利油田分公司地质科学研究院， 山东东营257022)

Cui Qinghui,Geophysical Research Institute of Shengli Oilfield,SINOPEC,Dongying 257022,China

地震子波在地震正演和反演中有着重要的作用,目前的子波提取主要基于最小相位假设,而实际的地震子波往往表现为混合相位特征。为了
提取具有真实相位的地震子波,从地震信号的统计性出发,利用高阶统计量中的双谱,从反射地震记录中提取出地震子波的真实相位,进一步重构
出地震子波。经过模型仿真和实际资料处理,证明了该地震子波提取方法的有效性和实用性。

Seismic wavelet plays an important role in seismic forward modeling and inversion.At present,wavelet extraction is mainly
based on the assumption that wavelet is min-phase.However,actual seismic wavelet often has mixed-phase.In order to extract
the seismic wavelet with actual phase,starting from the statistical characteristic of seismic signals,by using the bispectrum
of high-order statistics,the actual phase of seismic wavelet was extracted from reflection record to reconstruct seismic
wavelet.By modeling testing and actual data processing,the method is proved to be effective and practical.

10.3969/j.issn.1000-1441.2001.05.009