摘要
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。使用模型信号对比了纯相移法与双相移法谐波压制效果,验证了双相移法抗噪方面的优势。将双相移法应用于滑动扫描信号并分析其使用条件,分析对于不同起止扫描频率信号的适用性。考虑到实际地震数据往往由各种强弱不等的反射组成,建立地下多次反射模型,同时考虑更偏向实际情况的信号起止频率比,讨论双相移法的适用性。将该方法应用于实际数据处理,并与纯相移法进行比较,结果表明双相移法谐波滤除效果更好,具有一定的推广价值。
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 doublephase-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-phaseshift method can suppress harmonic distortion more effectively than the single-phase-shift method.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 considered 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.
作者
李波霖
王彦春
刘学清
张敬东
李韵竹
孙庭斌
LI Bolin;WANG Yanchun;LIU Xueqing;ZHANG Jingdong;LI Yunzhu;SUN Tingbin(School of Geophysics and Information Techno-logy,China University of Geosciences(Beijing),Beijing 100083,China;Beijing Jingneng Oil&Gas Resources Development Co.Ltd,Beijing 100022,China;BGP Geological Research Center,CNPC,Zhuo-zhou,Hebei 072751,China;CCDC Geological Exploration&Development Research Institute,CNPC,Chengdu,Sichuan 610051,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2021年第2期265-272,I0008,I0009,共10页
Oil Geophysical Prospecting
关键词
双相移法
谐波畸变
谐波消除
滑动扫描
可控震源
double-phase-shifts
harmonic distortion
harmonic elimination
slip-sweep technique
vibroseis
