海上拖缆随机采样抗混叠机理分析
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
目前海上拖缆地震采集只有道间距满足采样条件,而炮间距、炮线距和缆间距都不能满足采样条件,造成了地震数据的采样不足,导致频谱产生混叠效应。近年来发展了海上拖缆随机采集技术,为了分析该采集技术抗假频特性,以简谐信号和合成地震记录为研究对象,在空间规则采样的条件下,分别分析了充足采样和不充足采样情况下的频谱特征,分析了空间假频产生的原因。同时,在规则采样分析的基础上,对简谐信号和合成地震记录进行了随机抽样和频谱分析,研究了随机采样对空间假频的压制作用,数据分析结果表明海上拖缆地震随机采样可以降低频谱的混叠效应。
At present,sampling of marine towed streamer seismic acquisition is appropriate only when receiver points are in an in-line direction.However,sampling is inadequate when the shot points in the inline and the cross-line,or receiver points in the cross-line.Recently,in order to analyze the anti-aliasing characteristics,marine towed streamer random sampling technology is used to study the harmonic seismic signals and synthetic records.In conditions of regular space sampling,this paper analyzed spectrum characters of sufficient sampling,insufficient sampling,and the reason of spatial aliasing using this technology.Based on regular sampling analysis,this paper performed random sampling and spectrum analysis for harmonic seismic signals and synthetic records,and studied the effect of random sampling on alleviating aliasing.Data analysis showed that random sampling of marine towed streamer seismic can reduce the spectral aliasing effect.
引文
[1]Moldoveanu N.Random sampling:A new strategy for marine acquisition[M].80th Annual International Meeting,SEG,Extended Abstracts,2010:51-55.
    [2]Donoho L L.Compressed sensing[J].IEEE Transactions on Information Theory,2006,52(4):1289-1306.
    [3]Herrmann F J.Sub-Nyquist sampling and sparsity:How to get more information from fewer samples[M].79th Annual International Meeting SEG,Extended Abstracts,2010:51-55.
    [4]Zhou C,Schuster G T.Quasi-random migration of 3-D field daAbstracts,1995:1145-1148.
    [5]Hennenfent G,Herrmann F J.Simply denoise:Wavefield reconstruction via jittered undersampling[J].Geophysics,2008,73(3):19-28.
    [6]Herrmann F J.Sub-Nyquist sampling and sparsity:How to get more information from fewer samples[M].79th Annual International Meeting,SEG,Extended Abstracts,2009:3410-3413.
    [7]Shannon C E.Communication in the presence of noise[J].Proc.IRE,1949,37:10-21.
    [8]汪安民,王殊,陈明欣.一种抗混叠的非均匀周期采样及其频谱分析方法[J].信号处理,2005,21(3):240-243.
    [9]郭东亮,张铁军,戴宪华.基于非均匀采样的信号频率、幅值和相位检测[J].系统工程与电子技术,2012,32(4):662-665.
    [10]刘立祥,谢剑英,张敬辕.利用小波对非均匀采样信号进行重建[J].通信技术,2002,2(32):7-11.
    [11]Moldoveanu N.Circular geometry for wide-azimuth towedstreamer acquisition[M].70th Conference and Exhibitions,EAGE,Extended Abstracts,2008,G011.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心