| 角度域叠前时间偏移:非均匀介质中的单程波方法 |
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| 引用本文： | 卢宝坤,张剑锋,蒲泊伶.角度域叠前时间偏移:非均匀介质中的单程波方法[J].地球物理学报,2012,55(11):3795-3804. |
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| 作者姓名： | 卢宝坤 张剑锋 蒲泊伶 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所,北京 100029;2. 中国石油勘探开发研究院,北京 100083 |
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| 基金项目： | 国家自然科学基金重点项目，国家科技重大专项 |
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| 摘 要： | 从单程波方程出发,推导出角度域叠前时间偏移的走时、入射波与反射波夹角、成像幅值计算方法;构建了可直接生成角度域成像道集的叠前时间偏移方法与偏移流程.文中定量分析了速度梯度对走时、角度、幅值的影响,给出了可更好考虑介质非均匀性的角度、幅值计算方法.理论模型以及实际数据验证了本文方法的有效性.
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| 关 键 词： | 叠前时间偏移 角道集 单程波 速度梯度 |
| 收稿时间： | 2011-09-22 |
Pre-stack time migration in angle-domain: a one-way propagator approach in inhomogeneous media |
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| LU Bao-Kun
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ZHANG Jian-Feng
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PU Bo-Ling.Pre-stack time migration in angle-domain: a one-way propagator approach in inhomogeneous media[J].Chinese Journal of Geophysics,2012,55(11):3795-3804. |
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| Authors: | LU Bao-Kun ZHANG Jian-Feng PU Bo-Ling |
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| Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Petrochina Research Institute of Petroleum Exploration and Development, Beijing 100083, China |
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| Abstract: | Based on the one-way wave equation, we develop the schemes to calculate the travel time, angle between incident and reflection waves, and amplitudes for prestack time migration in angle-domain. A prestack time migration method and the work-flow that can generate imaging gathers in angle-domain are proposed. We do a numerical analysis of the effects of velocity gradient on travel time, angles, and amplitudes, and then propose angle and amplitude calculation methods that can treat media heterogeneity better. Numerical tests of model and real data demonstrate the effectiveness of the scheme. |
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| Keywords: | Pre-stack time migration Angle-domain gather One-way wave Velocity gradient |
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