| 横向各向同性介质弹性波多分量叠前逆时偏移 |
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| 引用本文： | 杜启振,秦童.横向各向同性介质弹性波多分量叠前逆时偏移[J].地球物理学报,2009,52(3):801-807. |
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| 作者姓名： | 杜启振 秦童 |
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| 作者单位： | 1.中国石油大学（华东）地球资源与信息学院，东营 257061;2.中国石油大学中国石油天然气集团公司物探重点实验室，北京 102249 |
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| 基金项目： | 教育部新世纪优秀人才支持计划，国家高技术研究发展计划(863计划)，中国石油天然气集团公司石油科技中青年创新基金，中国石油天然气集团公司物探重点实验室开放基金 |
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| 摘 要： | 随着油气勘探程度的提高，隐蔽油气藏在增储上产方面起到了重要作用，因此发展基于各向异性介质的多分量偏移方法是非常必要的.本文基于横向各向同性（VTI）介质，从二维弹性波速度\|应力方程出发，通过在时间上的二阶差分和空间上的交错网格高阶差分对方程进行离散，得到弹性波交错网格高阶差分的多分量逆时偏移算子.在激发时间成像条件的应用过程中引入Poynting矢量进行成像并消除逆时偏移所引起的低频干扰，在此基础上实现了VTI介质中二维弹性波叠前多分量逆时深度偏移.理论模型的偏移处理表明，该方法能够对地层进行准确成像，并可以消除逆时偏移所引起的低频噪声.
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| 关 键 词： | face=Verdana>成像条件 Poynting矢量 多分量 逆时偏移 交错网格 VTI介质 速度-应力方程 |
| 收稿时间： | 2008-6-11 |
| 修稿时间： | 2009-1-23 |
Multicomponent prestack reverse-time migration of elastic waves in transverse isotropic medium |
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| DU Qi-Zhen,QIN Tong.Multicomponent prestack reverse-time migration of elastic waves in transverse isotropic medium[J].Chinese Journal of Geophysics,2009,52(3):801-807. |
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| Authors: | DU Qi-Zhen QIN Tong |
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| Institution: | 1.Faculty of Earth Resource and Information, China University of Petroleum, Dongying 257061,China;2.CNPC Key Laboratory of Geophysical Exploration, China University of Petroleum (Beijing), Beijing 102249, China |
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| Abstract: | With the development of exploration in the mature exploration areas, the subtle trap is playing a dominant role. So, joint migration of multicomponent in anisotropic media is the key technology. This paper provided a full 2-D elastic prestack reverse time depth migration algorithm for common-source multicomponent data from VTI media. Extrapolation used the coupled anisotropic velocity-stress equation for variable velocity solved with a high order staggered grid finite-difference scheme in space and a second-order finite-difference scheme in time. A new imaging condition combined excitation-time imaging condition with Poynting vector was proposed to remove low-frequency artifacts. The algorithm was illustrated by application to synthetic data. The results show that this approach produces clear images and can remove low-frequency noises. |
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| Keywords: | Imaging condition Poynting vector Multicomponent Reverse-time migration Staggered grid VTI medium Velocity-stress equation |
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