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《Chinese Journal of Geophysics》 2016-01
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Research on correlation detection reference signal based on the reconstructed excitation signal for electromagnetic seismic vibrator

YANG Zhi-Chao;JIANG Tao;XU Xue-Chun;LIN Jun;JIA Hai-Qing;MA Rui-Qi;CHEN Zhen-Zhen;College of Instrument Science and Electrical Engineering,Jilin University;Key Laboratory of Geo-exploration Instruments,Ministry of Education of China(Jilin University);College of Earth Science,Jilin University;  
The electromagnetic seismic vibrator has wide application prospect in high resolutionseismic exploration.However,in searching of correlation detection reference signal for electromagnetic seismic vibrator,two conventional methods both have problems compared to hydraulic seismic vibrator in the condition that the subsurface media is complex or the base-plate is poorly coupled with ground.One method that based on the control-signal will cause error of wavelet arrival time.The other one that based on the near base-plate signal will cause error of waveform characters,called false multiple waves in this paper.This paper analyzes the errors above systematically and then proposes a method called correlation detection reference signal based on the reconstructed excitation signal(CDRSBRES).Firstly,the direct wave is separated and extracted from the near base-plate signal according to different arrival time among the direct wave and other seismic waves.Secondly,applying the extracted direct wave to reconstruct the vibrator excitation signal as the reference signal to detect the seismic data.Finally,the spectral whitening is used to improve the quality of detected result,such as the SNR and resolution.This paper designs a horizontal layer model to confirm the CDRSBRES method.The simulation data demonstrates that the correlation coefficient between the reconstructed excitation signal and the ideal excitation signal is 0.9869,up to high linear correlation.The correlation detected record by CDRSBRES method is consistent with the designed model not only on wavelet arrival time but also on waveform characters.Then a comparison experiment is carried out at one metal deposit in West China.It uses the correlation detected record of the hydraulic seismic vibrator MiniVib T15000 as a standard.Compared to MiniVib T15000,there are different results for the electromagnetic seismic vibrator PHVS 500.The 0.012 serror of wavelet arrival time is detected based on the control-signal method,corresponding error of vertical position is about11.16 m.The false multiple waves are detected based on the near base-plate signal method and it drops the SNR of detected record.But the error of wavelet arrival time is only 0.001 s,corresponding error on vertical position is down to 0.93 m.The waveform characteristic is consistent,no false multiple waves detected at the same zone using CDRSBRES method.In summary,the CDRSBRES method can be used for high precision detection of electromagnetic seismic vibrator data,especially for the region where the subsurface media is complex.It is of great significance for high resolution seismic exploration.
【Fund】: 深部探测技术与实验研究专项SinoProbe-09-06(201311197;201011083) SinoProbe-09-04(201011081);; 高等学校博士学科点专项科研基金(20110061110053)联合资助
【CateGory Index】: P631.4
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Chinese Journal Full-text Database 1 Hits
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