石油物探2012，Vol.51Issue(3)：239-243,5.DOI:10.3969/j.issn.1000-1441.2012.03.005
同态反褶积的子波稳定性方法研究
Research on the methods for wavelet stability of homomorphic deconvolution
蒋立 1谭佳 1张绪建1
作者信息
- 1. 中国石油天然气股份有限公司新疆油田分公司勘探开发研究院地球物理研究所,新疆乌鲁木齐830011
- 折叠
摘要
Abstract
Influenced by noise and non-random reflection coefficient, homomorphic deconvolution is hardly used in seismic data processing because of unstable phase of extracted wavelet. Aiming at the
problem, we proposed calculating mixed phase wavelet by using combining average Cepstral with average autocorrelation Cepstral, which were computed by small windows and multi-traces data, to improve the stability of wavelet phase and the practicability of ho-momorphic deconvolution. During the actual data processing, some countermeasures were used to improve the wavelet stability. Firstly , seismic wavelet is changed into mini-phase wavelet by exponential decay on seismic data. Secondly, after energy positioning on the obtained wavelet, the energy concentration part of wavelet is chosen to carry window shaping, and the influence of wavelet side lobe is suppressed Thirdly, the peak moveout between extracted wavelet and expected wavelet is adjusted. Finally, for 3-D post-stack data, the central trace deconvolution operator is calculated in adjacent multi-traces of INLINE and CDP directions. Theoretical model testing result proved that this method can be used in mixed-phase wavelet seismic data. Real data application results after de-convolution indicated that the calculated wavelet is stable and the resolution of seismic data is enhanced.关键词
同态反褶积/复赛谱/平均自相关/子波相位/指数衰减Key words
homomorphic deconvolution/ Cepstral/ average autocorrelation / wavelet phase/ exponential decay分类
天文与地球科学引用本文复制引用
蒋立,谭佳,张绪建..同态反褶积的子波稳定性方法研究[J].石油物探,2012,51(3):239-243,5.
