Seismic wave field decomposition method based on vector rotation in τ-p domain

被引：0
|
作者：
Zhang J. [1 ]
Zhang W. [1 ]
Zhang T. [1 ]
Sun P. [1 ]
Yuan Y. [2 ]
Li J. [1 ]
机构：
[1] Research & Development Center BGP, CNPC, Zhuozhou, 072751, Hebei
[2] School of Geophysics and Information Technology, China University of Geosciences(Beijing), Beijing
来源：
Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | 2020年 / 55卷 / 01期
关键词：
Multi-component; Vector rotation; Wave field decomposition; τ-p transform;
D O I：
10.13810/j.cnki.issn.1000-7210.2020.01.006
中图分类号：
学科分类号：
摘要：
High-fidelity elastic wave field decomposition has become a key processing step in multi-wave and multi-component seismic exploration.Conventional wave filed decomposition methods can be classified into two categories, kinematic methods and dynamic methods.Kinematic methods decompose the wave filed into P-P wave field and P-SV wave field in τ-p domain or in spatial domain.Dynamic methods focus on obtaining polarization characteristics of different types of wave.How-ever, neither of them can achieve ideal decomposition results because of their inherent limitations.Motivated by the idea of combining both kinematic and dynamic characteristics of the wave field, a wave field decomposition method based on vector rotation in τ-p domain was proposed in this paper.It takes near-surface velocity as the key parameter of wave field decomposition, and applies polarity rotation to the vertical and horizontal components of seismic wave field in τ-p domain.According to the polarization characteristics of different types of wave, it decomposes seismic wave field into P-P wave field and P-SV wave field to the correspon-ding polarization directions respectively.Model tests were carried out based on layered medium model and Marmousi Ⅱ model, and the method was also applied to real seismic data.The results demonstrated that the method can separate P-P wave and P-SV wave more accurately compared with conventional methods.It avoided energy anomaly, wave field aliasing and spatial aliasing, and preserved amplitude well after wave field decomposition. © 2020, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
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页码：46 / 56
页数：10
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