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《Journal of Chengdu University of Technology(Science & Technology Edition)》 2004-06
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Improved accuracy of picking first arrival with wavelet transform in seismic survey

ZHAN Yi, ZHONG Ben-shan (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, China)  
Picking first arrival is the base of refraction statics, and it is often difficult to do with many data in the northwest area of China. In this paper, the authors discuss the factors to influence the accuracy of picking first arrival. Contraposing these factors, the authors present the preprocessing method before picking first arrival. This method is based on the wavelet function and the transform scale selecting, uses the wavelet transform to eliminate noise by the threshold selecting method and the continuous wavelet transform to improve the first arrival's waveform of maximum amplitude, in the same time, stands out the break point time of first arrival in order to improve the accuracy of picking first arrival. The results of theoretic models and actual samples show that this method has a wonderful foreground in its application and is of important significance to those ways often used in picking first arrival.
【CateGory Index】: P631.4
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