双相移滑动扫描谐波压制方法

纯相移谐波压制滤波法作为去除可控震源高次谐波的一种简便、高效的方法,在处理复杂信号时却对白噪声和相邻炮信号的处理能力稍显不足,因此未能投入实际应用.为了将简捷的相移法用于实际地震数据处理,提出双相移谐波压制滤波法.该方法在对纯相移法原有相移曲线进行微调和润色的同时,针对纯相移法无法处理的这部分信号再进行一次相移.使用模...

Double-phase-shift filtering method for eliminating harmonic distortion in processing slip-sweep vibroseismic signals

Although simple and efficient for eliminating harmonic distortion of vibroseismic data, the single-phase-shift filtering method is less effective for dealing with complex signals such as white noise and signals recorded by slip-sweep vibroseis survey, so it failed to be put into actual application. In view of this situation, we propose a double-phase-shift filtering method. It manipulates and polishes the original phase shift from the traditional phase shift method, and at the same time carries out another phase shift to process the signal that the single-phase-shift filtering method cannot process. Applied on model data, the double-phase-shift method can suppress harmonic distortion more effectively than the single-phase-shift me-thod. Then we applied the double-phase-shift filtering method to slip-sweep signals, and analyzed the applicable conditions. In view of the fact that raw seismic data are composed of various reflections with different intensity, a subsurface model with multiple reflections should be established, and the frequency ratio of signals should be consi-dered in order to discuss the applicability of the double-phase-shift method. Applied for raw data and compared with the single-phase-shift filtering method, the double-phase-shift method is better in suppressing harmonic distortion and worthy promoting.