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。 Wavelet domain time-frequency analysis and feature extraction method is a new means to study seismic wave information. In this paper, the wavelet transform theory is applied to seismic data instantaneous features and phase group features extraction, including: instantaneous phase profile and phase characteristic profile; instantaneous amplitude profile and group characteristic profile; and instantaneous frequency profile. The results of this method can accurately identify the existence and distribution of Ordovician weathering crust erosion gully in the Lower Paleozoic of Changqing Gas Field, and have achieved good results and solved the problems that conventional sections can not solve.