基于三元伪随机编码的可控震源信号设计方法
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摘要
常规的可控震源线性扫描信号的地震响应存在着相关信号旁瓣大、分辨率低的缺点,用二元伪随机编码信号作为可控震源的扫描信号,在地震响应剖面中存在严重的相干噪声,降低了地震记录的信噪比。本文利用具有理想相关特性的三元伪随机序列进行可控震源信号编码设计,并经三元伪随机编码扫描地震响应的数值模拟表明,利用具有理想相关特性的三元伪随机序列进行可控震源信号编码设计,使地震响应剖面中的相干噪声较二元编码结果显著地减弱,从而使得地震响应剖面的信噪比得到明显提高。
In seismic acquisition if regular linear scanning signal is used for the vibroseis,seismic response will show large sidelobes and the resolution for the seismic response will be low,if using dualistic pseudo-random code as scanning signal for the vibroseis,the severe noise will be generated in seismic response section and the signal-to-noise ratio will be decreased.In this paper the ternary pseudo-random series with ideal correlation characteristics was used to design vibroseis signal coding,the numerical simulation for seismic response shows that if using the ternary pseudo-random coding technology much more noise in the seismic response was eliminated compared with using dualistic pseudo-random coding so that the seismic signal-to-noise ratio was greatly improved on the seismic response section.
In seismic acquisition if regular linear scanning signal is used for the vibroseis,seismic response will show large sidelobes and the resolution for the seismic response will be low,if using dualistic pseudo-random code as scanning signal for the vibroseis,the severe noise will be generated in seismic response section and the signal-to-noise ratio will be decreased.In this paper the ternary pseudo-random series with ideal correlation characteristics was used to design vibroseis signal coding,the numerical simulation for seismic response shows that if using the ternary pseudo-random coding technology much more noise in the seismic response was eliminated compared with using dualistic pseudo-random coding so that the seismic signal-to-noise ratio was greatly improved on the seismic response section.
引文
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[2]姜福豪,王德江.可控震源高分辨率地震勘探采集技术.石油地球物理勘探,2007,42(2):127～131
[3]Goupillaud P L.Signal design in the“vibroseis”tech-nique.Geophysics,1976,41(6):1291～1304
[4]王忠仁,陈祖斌,张林行等.可控震源非线性扫描地震响应的数值模拟.地球物理学进展,2006,21(3):756～761
[5]Cunningham AB.Some alternate vibrator signals.Ge-ophysics,1979,44(12):1901～1921
[6]万哲先.代数和编码.北京:科学出版社,1980
[7]Ipatov V P.Ternary sequences with ideal periodic au-tocorrelation properties.Radio Eng Electron Phys,1979,24:75～79
[2]姜福豪,王德江.可控震源高分辨率地震勘探采集技术.石油地球物理勘探,2007,42(2):127～131
[3]Goupillaud P L.Signal design in the“vibroseis”tech-nique.Geophysics,1976,41(6):1291～1304
[4]王忠仁,陈祖斌,张林行等.可控震源非线性扫描地震响应的数值模拟.地球物理学进展,2006,21(3):756～761
[5]Cunningham AB.Some alternate vibrator signals.Ge-ophysics,1979,44(12):1901～1921
[6]万哲先.代数和编码.北京:科学出版社,1980
[7]Ipatov V P.Ternary sequences with ideal periodic au-tocorrelation properties.Radio Eng Electron Phys,1979,24:75～79
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