| 单向传播子的局部平面波分解以及在定向照明分析和目标特征成像中的应用 |
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| 引用本文： | 冯伟,吴如山,马在田.单向传播子的局部平面波分解以及在定向照明分析和目标特征成像中的应用[J].地球物理学进展,2007,22(1):171-178. |
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| 作者姓名： | 冯伟 吴如山 马在田 |
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| 作者单位： | 1.中山大学科学计算与计算机应用系，广州 510275；2.加州大学圣克鲁兹分校地球物理与行星物理研究所正演和成像实验室，美国加州 CA 95064；3.同济大学海洋与地球科学学院，上海 200092 |
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| 基金项目： | 国家863计划课题(2003AA611020/01)，广东省自然科学基金(05003308)联合资助 |
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| 摘 要： | 本文基于波场的局部平面波分解，得到空间和方向都具有局部性的局部平面波小波束，并由此对Fourier有限差分传播算子进行局部平面波分解.这种用小波束分解的单向传播算子，可被用来对采集系统进行定向照明分析和采集倾角响应估算，以分析采集系统布局和上覆结构对面向目标的叠前偏移成像质量的影响.进而，利用局部平面波成像矩阵及其成像相册，根据目标结构的主倾角方向，抽取并叠加部分局部平面波像，可以进行目标结构定向化特征成像.最后，对具有速度强横向变化上覆结构的陡倾角目标断层的复杂二维SEG-EAGE盐丘模型数据，进行采集系统目标照明分析和目标结构定向化特征成像.
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| 关 键 词： | 局部平面波分解 定向照明分析 采集倾角响应 局部平面波成像 |
| 文章编号： | 1004-2903（2007）01-0171-08 |
| 收稿时间： | 2006-05-11 |
| 修稿时间： | 2006-08-20 |
Local plane wave decomposition of one-way propagator and the applications to directional illumination analysis and target-structure oriented imaging |
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| FENG Wei,WU Ru-shan,MA Zai-tian.Local plane wave decomposition of one-way propagator and the applications to directional illumination analysis and target-structure oriented imaging[J].Progress in Geophysics,2007,22(1):171-178. |
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| Authors: | FENG Wei WU Ru-shan MA Zai-tian |
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| Institution: | 1. Department of Computation and Computer Engineering, Sun Yat-sen University, Guangzhou 510275, China 2. Modeling and Imaging Lab, IGPP, University of California, Santa Cruz, CA 95064, USA 3. School of Ocean and Earth Science, Tongji University, Shanghai 200092, China |
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| Abstract: | Based on the local plane wave decomposition of wave fields,the local plane wave beam with the double localization property in both space and direction is obtained.So the local plane wave decomposition is applied to Fourier finite-difference propagator.The single direction propagator through beamlet decomposition is used to evaluate directional illumination and acquisition-aperture efficacy of acquisition system,which can investigate the influences of acquisition geometry and overlaying structures on the target-oriented prestack migration image quality.Further,for the local plane wave image matrices and its albums,in terms of the dominant dipping angle of the target structure,we only select and superpose the local plane wave images of the contributing angle pairs,and obtain the target-structure oriented imaging.As the numerical example,for the complex 2D SEG-EAGE salt model,with strong lateral velocity variations and steep dipping target fault,we test the directional illumination analysis of the acquisition system and the target-structure oriented imaging. |
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| Keywords: | Local plane wave decomposition Directional illumination analysis Acquisition-aperture response Local plane wave imaging |
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