时频域零炮检距地震道拟合

如何提高地震资料的信噪比和分辨率。是地震资料处理中的关键。本文在分析地震共中心点道集的AVO特性。以及不同炮检距信号经过不同路径的地层吸收的基础上。发现对于某一时刻的不同炮检距地震信号的不同频率成分。可以用多项式描述其与炮检距aT的关系。进而提出了基于信号时频分析和多项式拟合的时频域零炮检距地震道拟合技术。司时。利用多道信号估算的信噪比来设计的时频域Wiener滤波器。克服了常规多项式拟合技术压制噪声能力不足的缺陷。

Fitting a zero-offset seismic trace in time-frequency domain.

How to improve signal to noise ratio and resolution of seismic data is key of seismic data processing. Based on analyzing AVO characters of seismic CMP gather and stratigraphic absorption passing different path by different offset signal,the paper discovered that for different frequency component of seismic signal at different offset signal at a certain moment,the relation between frequency and offset x can be described by polynomial and then the technique of fitting a zero offset seismic trace in time frequency domain based on time frequency analysis and fitting of polynomials has been proposed.Meanwhile,Wiener filter in time frequency domain designed by signal to noise ratio of multi traces signal evaluation overcame the shortcoming of insufficient to suppress noise in ordinary technique of fitting of polynomials.