可控震源扫描信号的整形设计方法

Shaped design of vibrator sweeping signal

CNPC东方地球物理勘探有限责任公司采集技术支持部，河北涿洲072751

Acquisition Technical Support Department,BGP,CNPC,ZhuoZhou 072751,China

扫描信号的相关旁瓣是影响可控震源资料质量的主要因素。在常规可控震源扫描信号的设计中，通过对扫描参数的优化选择，可以使相关旁瓣有所减少，但不能彻底消除相关旁瓣的影响。可控震源扫描信号整形设计方法根据Ricker子波无旁瓣的特性，通过整形算法设计扫描信号，使其能够满足相关子波等于Ricker子波、振幅谱等于Ricker子波频谱的要求，将整形扫描信号以文本方式提供给可控震源。以整形设计产生的扫描信号代替扫描信号发生器产生的非线性扫描信号，可以大大提高资料的信噪比。新疆某地区的试验结果表明，该方法是可行和有效的。

The relative side lobe of sweeping signal is an important factor impacting the seismic data quality acquired by vibrator.In conventional vibrator sweeping signal design,the side lobes will be decreased by optimizing sweeping parameters,but it cannot entirely remove the influence of relative side lobes.In terms of the characteristics of Ricker wavelet without side lobes,shaped design method of vibrator sweeping signal is by designing sweeping signal,to satisfy that the correlation wavelet is equal to Ricker wavelet,and its amplitude spectrum is equal to the frequency spectrum of Ricker wavelet,to provide shaped sweeping signal in text format to vibrator.Replacing nonlinear sweeping signal produced by sweeping signal generator with sweeping signal produced by shaped design can largely improve the S/N of seismic data.The testing results in some area 〖JP+1〗of Xinjiang province indicate that the method is feasible and effective.