可控震源滑动扫描谐波干扰压制方法

可控震源滑动扫描是高密度地震勘探中的一种高效采集技术，但它在大幅度提高野外地震数据采集作业效率的同时，其固有的谐波干扰也严重地影响了地震资料品质。目前常用的滑动扫描谐波干扰压制方法是模型法，即基于震源力信号设计谐波预测算子，求取相关后记录中的谐波干扰，将求得的谐波干扰从被干扰区域中剔除。然而在实际地震数据采集中由于设备等原因往往缺失震源力信号，因此无法应用模型法压制谐波。本文基于准噶尔西北缘玛西1井三维震源力信号的实际数据，尝试应用独立同步扫描邻炮干扰压制方法滤除滑动扫描资料上的谐波干扰，取得了令人满意的处理效果。

Harmonic interference suppression on vibroseis slip sweep data

Vibroseis slip sweep is one of the high productivity acquisition methods suitable for density seismic exploration. However harmonic interferences caused by slip sweep impact on seismic data quality. The commonly used method for harmonics suppression from slip sweep data, “model method”, adopt a filter derived from the vibrator ground force to estimate harmonics on correlated data, and then subtract them from the correlated data. However, in field operation the vibrator ground force is often missing due to some reason, so the “model method” cannot be used to suppress harmonics in this case. As we know that adjacent VP interference suppression is always used on independent simultaneous sweep (ISS) data. We may consider harmonics on slip sweep data as a kind of “adjacent VP interference”. For vibroseis slip sweep 3D seismic data in the Northwestern Junggar Basin, we use the model method when the vibrator ground force is available, and adopt adjacent VP interference suppression when the vibrator ground force is missing. Application results show that our approach can effectively suppress harmonics from the 3D slip sweep data.