【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。更多还原

【Abstract】 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.更多还原