• 责任者：Gao Jian (Key Lab. of Geo-Exploration and Instrumentation ; Ministry of Education ; College of Instrumentation and Electrical Engineering ; Jilin University ; Changchun 130026 ; China) ; Wang Zhongren
• 刊名：Chinese Journal of Geophysics
• 出版年：2012
• 卷期：55(4)
• 关键词：可控震源 ; vibroseis
• 页码：p.1384-1389
• 图表：2 illus., 18 refs.
• 分类号：1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

Seismic response of conventional Chirp sweeping for Vibroseis has obvious side-lobe effect and the decoded seismic section of binary m-sequence pseudorandom sweeping has serious correlation noises, while the matched sweeping method based on pseudorandom coding can suppress the correlation noises in the seismic section effectively and improve the SNR of seismic records. In order to apply the matched pseudorandom coding method to impact seismic sources, matched impact seismic technique for pulse-coded seismic sources was developed. The coding and decoding processes for matched impact signals were given with matched sweeping method as the rationale. Simultaneously, seismic numerical simulation for matched impact seismic technique and the conventional linear swept impact technique were conducted using finite difference method. The results show that the decoded seismic section for matched impact method has very high SNR and seismic resolution without the correlation noises in comparison with the linear swept impact method. The seismic excitation and acquisition experiments verify the superiority of matched impact seismic technique in suppressing the correlation noises and the random noises of large-offset seismic traces compared with the linear swept impact technique.