基于保幅波场分离的弹性波逆时偏移方法研究

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Bibliographic Details
Published in应用地球物理：英文版 Vol. 13; no. 3; pp. 500 - 510
Main Author 杨佳佳 栾锡武 方刚 刘欣欣 王小杰 潘军
Format Journal Article
LanguageEnglish
Published 2016
Subjects
保幅成像
矢量合成
矢量波场
纵横波成像
逆时偏移
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ISSN1672-7975
1993-0658

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Bibliography:Vector wavefield, reverse-time migration, PP-wave and PS-wave imaging, vector modulation, amplitude-preserving imaging
Imaging the PP- and PS-wave for the elastic vector wave reverse-time migration requires separating the P- and S-waves during the wave field extrapolation. The amplitude and phase of the P- and S-waves are distorted when divergence and curl operators are used to separate the P- and S-waves. We present a P- and S-wave amplitude-preserving separation algorithm for the elastic wavefield extrapolation. First, we add the P-wave pressure and P-wave vibration velocity equation to the conventional elastic wave equation to decompose the P- and S-wave vectors. Then, we synthesize the scalar P- and S-wave from the vector P- and S-wave to obtain the scalar P- and S-wave. The amplitude-preserved separated P- and S-waves are imaged based on the vector wave reverse-time migration （RTM）. This method ensures that the amplitude and phase of the separated P- and S-wave remain unchanged compared with the divergence and curl operators. In addition, after decomposition, the P-wave pressure and vibration velocity can be used to suppress the interlayer reflection noise and to correct the S-wave polarity. This improves the image quality of P- and S-wave in multicomponent seismic data and the true-amplitude elastic reverse time migration used in prestack inversion.
Yang Jia-Jia1,2, Luan Xi-Wu1,2, Fang Gang1,2, Liu Xin-Xin1,2, Pan Jun1,2, Wang Xiao-Jie1,2 （1. Key Laboraiory of Marine HydrocarbonResources and Environmental Geology, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, China; 2. Laboratory for Marine Mineral Resources, National Laboratory for Marine Science and Technology, Qingdao 266071, China.）
11-5212/O
ISSN:1672-7975
1993-0658