基于时频重排的地震信号Wigner-Ville分布时频分析  

Time-frequency analysis on Wigner-Ville distribution of seismic signal based on time-frequency rearrangement

作　　者：吴小羊[1] 刘天佑[1] 

机构地区：[1]中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430074

出　　处：《石油地球物理勘探》2009年第2期201-205,共5页Oil Geophysical Prospecting

摘　　要：在分析多种时频分析方法基础上,本文实现了一种基于时频重排算法的Wigner-Ville分布时频分析方法。即首先采用Gauss窗函数对Wigner-Ville分布进行时域和频域加窗平滑处理,再将能量的平均值按照区域能量的重心进行分配,重新安排信号在时频平面内的能量分布,这样可在抑制交叉项的同时保持好的时频聚集性。最后对川西拗陷须家河组气藏和黄骅拗陷火成岩油藏进行平滑伪Wigner-Ville分布时频分析,并与常规分析方法对比,结果表明平滑伪Wigner-Ville分布适用于地震信号的时频分析,并且更能突出时频的局部化特征和储层的微观结构,具有更好的时频分辨率。Based on multiple time-frequency analyzing methods,the paper finished a time-frequency analysis method of Wigner-Ville distribution based on time-frequency rearrangement algorithm.Firstly,we use Gaussian window function to carry out smooth processing with window in time and frequency domain for Wigner-Ville distribution,then,distribute the average value of energy according to the barycenter of regional energy,rearranging the energy distribution of signal in time-frequency plane,thus keeping the time-frequency gather while suppressing the cross-terms,and finally implement the time-frequency analysis of smoothed pseudo Wigner-Ville distribution for Xujiahe gas reservoir in Chuanxi depression and igneous reservoir in Huanghua depression and make comparison with conventional analysis methods,which showed that the smoothed pseudo Wigner-Ville distribution is suitable for time-frequency analysis of seismic signal,and further highlights the local time-frequency feature and micro-structure of reservoir.

关 键 词：重排 交叉项 WIGNER-VILLE分布 分辨率 地震信号 

分 类 号：TN911.7[电子电信—通信与信息系统] P631.443[电子电信—信息与通信工程]