摘要
基于伪噪声假说,可控震源符号位地震记录只需通过相关、叠加等步骤,其结果即可显示信号的相对振幅。它既不要求预先知道环境噪声的分布形式,也不要求信号一噪声(随机环境噪声)比S/N<1,而且叠加结果也不再需要作非线性校正.至于信号的恢复效果,则由信号一伪噪声比及是否有足够的叠加(含相关)次数决定。在野外数据采集过程中,不仅需要正确合宜地选取观测系统,而且还必恰到好处地选取扫描参数,以尽可能抑制伪噪声、提高信号一伪噪声比,从而降低恢复真振幅所需的叠加次数,使真振幅恢复得以实现.
The output of operations such as correlation, stacking, etc., for sign-bit seismic records generated by vibroscis, can reflect relative amplitude of the records according to pseudo-noise theory. It is not necessary neither ambient noise distribution to be known in advance, nor signal-to-noisc (random ambient noise) ratio S / N<l to be required, and nor nonlinear correction for stacked signals to be needed.As far as recovery quality of the signals is concerned, it is determined by both signal-to-pscudo-noise ratio and stacking (correlation) fold. During field acquisition, it is required not only to correctly select layout, but also to pick up suitable sweeping parameters to suppress pscudo-noise and improve signal-to-pscudo-noise ratio as possible as they can. Thus the stacking fold required by true amplitude recovery can be reduced and true amplitude recovery can therefore be realized.
出处
《石油物探》
EI
CSCD
北大核心
1993年第2期118-122,共5页
Geophysical Prospecting For Petroleum
关键词
伪噪声
可控震源
地震记录
真振幅
Pseudo-Noise, Vibroscis, Sign-Bit Seismic Record, True Amplitude Recovery
