Double-phase-shift filtering method for eliminating harmonic distortion in processing slip-sweep vibroseismic signals
LI Bolin1, WANG Yanchun1, LIU Xueqing2, ZHANG Jingdong3, LI Yunzhu4, SUN Tingbin3
1. School of Geophysics and Information Techno-logy, China University of Geosciences(Beijing), Beijing 100083, China; 2. Beijing Jingneng Oil & Gas Resources Development Co. Ltd, Beijing 100022, China; 3. BGP Geological Research Center, CNPC, Zhuo-zhou, Hebei 072751, China; 4. CCDC Geological Exploration & Development Research Institute, CNPC, Chengdu, Sichuan 610051, China
Abstract：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.
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