Zero-Offset VSP Wavefield Separation Using Two-Step SVD Approach
详细信息
- 责任者：Gao Lei (Institute of Wave and Information ; School of Electronic and Information Engineering ; Xi’an Jiaotong University ; Xi’an 710049 ; China) ; Chen Wenchao
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(5)
- 关键词：垂直地震剖面 ; vertical seismic profiles ; 波场分离 ; wavefield separate
- 页码：p.1667-1675
- 图表：illus., 17 refs.
- 分类号：1600
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
With the development of seismic attribute analysis technique,the fidelity of waveform and amplitude becomes important to wavefield separation method.In this paper,we present a zero-offset vertical seismic profiling(VSP) wavefield separation method with good fidelity.The method is based on singular value decomposition(SVD) filtering and has four stages: first,aligning events of downgoing wave by static time shifting each trace of VSP;second,suppressing downgoing wave by high-pass SVD filtering;third,aligning events of upgoing wave by static time shifting each trace of downgoing wave suppressed wavefield;fourth,extracting upgoing wave by low-pass SVD filtering.It is difficult to calculate the time shift of each trace for aligning events of upgoing wave,as the residual downgoing wave in downgoing wave suppressed wavefield is not very weak.In this paper,we calculate the time shift via the largest singular value maximization algorithm.Using the synthetic and real data examples,we demonstrate that the results of our method have good fidelity,and are better than the results of traditional SVD method.The result of synthetic data also show that our method can be used as preprocess of Q estimation.
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