小波变换求取地震特征在识别侵蚀沟谷中的应用

Seismic characteristic obtainment using wavelet transform is applied to recognition of palaeoerosional valley

小波域的时频分析和特征参数提取方法是研究地震波信息的一种新手段。本文应用小波变换理论对地震资料进行地震瞬时特征和相群特征的提取，包括：瞬时相位剖面和相特征剖面;瞬时振幅剖面和群特征剖面;以及瞬时频率剖面。应用该方法的处理结果可以准确地识别长庆气田下古生界奥陶系风化壳侵蚀沟谷的存在及展布情况，取得了很好的效果，解决了常规剖面无法解决的问题。

Time-frequency analysis and characteristic parameter obtainment in wavelet domain are important new means for seismic information research. Wavelet transform theory is used to obtain both the instantaneous and phase-group characteristics of seismic data, including instantaneous phase section, phase characteristic section, instantaneous amplitude section, group characteristic section and instantaneous frequency section. Processing results of this method have been adopted to ascertain successfully erosional valley lying in Ordovician residuum in Changqing gas field, thus solving the geological problem which will not be resolved by using ordinary selsmic section.