滑动扫描可控震源地震数据谐波干扰的消除方法

Method of eliminating harmonic noise for vibroseis data in slip sweep technique

滑动扫描技术由于缩短了相邻两炮的滑动时间,使得采集效率得到很大提高,同时也使得后一炮中的谐波畸变对前一炮的基波产生影响,降低了地震资料的质量。对扫描信号进行时频分析,利用基波及谐波相关后的特征,设计出提取谐波的算子。将该算子作用于相关前原始地震记录,可以提取记录中的高阶谐波。实际资料处理前、后的时频分析验证了该方法的效果。

To improve the efficiency of acquisition,one vibrator group starts sweeping without waiting for the previous group's sweep to terminate,this is called 'slip sweep'.But this arrangement will generate harmonic noise in the previous shot record from the next shot and result in seismic data quality reduction.We analyzed the sweep signal in time-frequency domain and designed a harmonic separated operator by utilizing the correlated characteristics of harmonic distortion and fundamental signal.By applying this harmonic separated operator to the uncorrelated raw seismic data,high-order harmonic noise will be obtained.The comparison analysis of time-frequency maps between conventional record and harmonic noise removing record shows that the effect of this high-order harmonic noise attenuation method is effective.