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Analysis of the Frequency Domain Water-level Deconvolution Method Based on Reservoir Airgun Source Data
You Xiuzhen,Li Jun,Lin Binhua,Huang Yandan,Wu Lihua,Guo Yang
Author NameAffiliationE-mail
You Xiuzhen Fujian Earthquake Agency, Fuzhou 350003, China  
Li Jun Fujian Earthquake Agency, Fuzhou 350003, China lixjix@163.com 
Lin Binhua Fujian Earthquake Agency, Fuzhou 350003, China  
Huang Yandan Fujian Earthquake Agency, Fuzhou 350003, China  
Wu Lihua Fujian Earthquake Agency, Fuzhou 350003, China  
Guo Yang Fujian Earthquake Agency, Fuzhou 350003, China  
摘要:
Based on the 2016 airgun experimental data of the Fujian Nanyi reservoir, we adopted the frequency domain water-level deconvolution method and cross-correlation time delay detection technique to study the influence of level scaling factor and the background noise level of the station on deconvolution calculation results, and analyze the effect of deconvolution on eliminating the influence of the source caused by different air-gun pressures. The results show that:(1) When the level scaling factor is smaller, the signal to noise ratio of the waveform after the deconvolution is smaller, and when the level scaling factor is over smaller, the identification error of travel time is greater. (2) When the SNR of the station record is higher, the recognition accuracy of travel time is higher, the influence of SNR on the reference station record is far greater than the far station, when the SNR of the far station record is more than 10, the error of travel time is within 6ms, but when the SNR of the reference station record is 30, the travel time error may reach to 20ms. (3) When the airgun source difference is big, the frequency domain water-level deconvolution method has better effect on eliminating the source influence, but the method error may be introduced when the source difference is small.
关键词:  Large volume airgun  Water-level deconvolution in frequency domain  Cross-correlation time delay  Green's function
DOI:
分类号:
基金项目:This project was sponsored by "Analysis of Accuracy of Airgun Source in Monitoring Crustal Media Change and Its Influence Factors",the National Natural Science Foundation of China (41774068), and Special Fund for Science and Technology,Fujian Earthquake Agency (SF201709).
Analysis of the Frequency Domain Water-level Deconvolution Method Based on Reservoir Airgun Source Data
You Xiuzhen,Li Jun,Lin Binhua,Huang Yandan,Wu Lihua,Guo Yang
Abstract:
Based on the 2016 airgun experimental data of the Fujian Nanyi reservoir, we adopted the frequency domain water-level deconvolution method and cross-correlation time delay detection technique to study the influence of level scaling factor and the background noise level of the station on deconvolution calculation results, and analyze the effect of deconvolution on eliminating the influence of the source caused by different air-gun pressures. The results show that:(1) When the level scaling factor is smaller, the signal to noise ratio of the waveform after the deconvolution is smaller, and when the level scaling factor is over smaller, the identification error of travel time is greater. (2) When the SNR of the station record is higher, the recognition accuracy of travel time is higher, the influence of SNR on the reference station record is far greater than the far station, when the SNR of the far station record is more than 10, the error of travel time is within 6ms, but when the SNR of the reference station record is 30, the travel time error may reach to 20ms. (3) When the airgun source difference is big, the frequency domain water-level deconvolution method has better effect on eliminating the source influence, but the method error may be introduced when the source difference is small.
Key words:  Large volume airgun  Water-level deconvolution in frequency domain  Cross-correlation time delay  Green's function