Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 88-94.doi: 10.12108/yxyqc.20190609

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Time-varying wavelet deconvolution method based on zero-offset VSP data

ZHAO Yan1,2, MAO Ningbo1,2   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education(Yangtze University), Wuhan 430100, China;
    2. School of Geophysics and Oil Resources, Yangtze University, Wuhan 430100, China
  • Received:2019-06-11 Revised:2019-08-26 Online:2019-11-21 Published:2019-09-28

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Abstract: An effective way to improve the resolution of surface seismic data is to extract deconvolution operators from VSP data and use them for surface seismic data. However,the conventional VSP wavelet deconvolution method commonly extracts a fixed deconvolution operator without considering the time-varying characteristics of seismic wavelet. Since seismic wavelet is time-varying,it is not accurate to extract a wavelet deconvolution operator from VSP for surface seismic records. A method was proposed for extracting time-varying wavelet deconvolution operators by using VSP data. It takes the down-going direct wave of zero-offset VSP data as oneway VSP seismic wavelet,and converts its amplitude spectrum of the direct wave to that of two-way seismic wavelet by using the attenuation function of subsurface medium. Under the assumption of minimum phase,the time-varying deconvolution operator can be obtained from the amplitude spectrum,and then applied to poststack surface seismic data. Synthetic data and real data examples demonstrate that the proposed method can effectively compensate the amplitude energy and improve the resolution of seismic records.

Key words: time-varying wavelet, deconvolution, post-stack seismic data, zero-offset VSP data

CLC Number: 

  • P631.44
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