摘要
在地震数据采集中,如果测线上方有高压输电线通过,记录中就会出现50 Hz左右的强单频干扰波。这种干扰波从浅层到深层频率、相位和振幅基本保持不变,因此,采用频率域压制方法很难完全将其消除干净,且会伤害到有效信号。但可以在时间域采用同频率不同振幅的正弦函数和余弦函数的组合来逼近这种单频干扰波,并从地震记录中将其减去,达到消除这种干扰波的目的。本方法的最大优点就是能够有效地消除干扰波,而不伤害干扰波附近的有效信号,从而提高单频波频率分量附近数据的信噪比。实际数据试算结果表明该方法有效可行。
In seismic data acquisition,if a high voltage power transmis- sion line crosses over a seismic line,a strong single-frequency inter- ference wave around 50Hz will appear in seismic record,and its frequency,phase and amplitude almost remain stationary.There- fore,frequency domain suppression method can not entirely remove the interference wave,which may damage the effective signal.The combination of sine function and cosine function with the same fre- quency but different amplitudes in time domain can be used to ap- proach the single-frequency interference wave.Then the interfer- ence wave is subtracted from the seismic record to eliminate it.The major advantage of this method is that it can quickly and effectively eliminate the interference wave without damaging the effective sig- nals around the interference wave,greatly improve the S/N.actual data trial results show that the method is feasible and effective.
出处
《石油物探》
EI
CSCD
2008年第4期352-356,18,共5页
Geophysical Prospecting For Petroleum
关键词
地震数据采集
单频波
衰减
信噪比
逼近
频率自适应
seismic data acquisition
monochromatic-frequency wave
attenuation
S/N
approximation
frequency adaptation
