| 基于Gabor-Daubechies小波束叠前深度偏移的角度域共成像道集 |
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| 引用本文： | 陈凌,吴如山,王伟君.基于Gabor-Daubechies小波束叠前深度偏移的角度域共成像道集[J].地球物理学报,2004,47(5):876-885. |
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| 作者姓名： | 陈凌 吴如山 王伟君 |
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| 作者单位： | 中国科学院地质与地球物理研究所,北京,100029;University of California,Santa Cruz California 95064 U.S.A;中国地震局分析预报中心,北京,100036 |
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| 基金项目： | 中国科学院知识创新工程重大项目 (KZCX1 0 7)，国家自然科学基金项目 ( 4 0 3 740 15 ) |
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| 摘 要： | 传统炮检距域共像集（CIG）在复杂介质中因波传播的多路径而存在反射体位置不确定的问题. 角度域CIG由于克服了这一缺陷而逐步成为速度分析、AVA以及振幅保真偏移成像等研究的主要手段. 以波动理论为基础的地震偏移成像方法的发展为获得高质量的角度域CIG提供了可靠的实现途径. 其中，基于波场局域化分解和传播的小波束域波场延拓和偏移成像方法，因其波场分解基本函数和传播算子在空间和方向上的双重局域特性，而成为角度相关分析研究的有效工具. 本文在采用Gabor Daubechies框架分解的小波束叠前角度域偏移成像基础上，利用不同的叠加方法由局部角度域像矩阵得到了反射角域CIG（CRAIG）和倾角域CIG（CDAIG）. 以SEG EAGE二维盐体模型为例，通过对CRAIG和CDAIG的对比，探讨了这两种角度域CIG的特点及其在地震偏移成像中的潜在应用.
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| 关 键 词： | Gabor-Daubechies小波束叠前深度偏移 局部角度域像矩阵 共反射角像集 共倾角像集 SEG-EAGE 二维盐体模型 |
| 文章编号： | 0001-5733(2004)05-0876-10 |
| 收稿时间： | 2003-6-19 |
| 修稿时间： | 2004-5-10 |
COMMON ANGLE IMAGE GATHERS OBTAINED FROM GABOR-DAUBECHIES BEAMLET PRESTACK DEPTH MIGRATION |
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| CHEN Ling WU Ru-Shan WANG Wei-Jun Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China University of California,Santa Cruz,California ,U.S.A Center for Analysis and Prediction,China Earthquake Administration,Beijing ,China.COMMON ANGLE IMAGE GATHERS OBTAINED FROM GABOR-DAUBECHIES BEAMLET PRESTACK DEPTH MIGRATION[J].Chinese Journal of Geophysics,2004,47(5):876-885. |
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| Authors: | CHEN Ling WU Ru-Shan WANG Wei-Jun Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China University of California Santa Cruz California USA Center for Analysis and Prediction China Earthquake Administration Beijing China |
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| Institution: | 1.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 2 University of California, Santa Cruz, California 95064, U.S.A 3 Center for Analysis and Prediction, China Earthquake Administration, Beijing 100036, China |
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| Abstract: | Due to multi-paths of wave propagating through complex media, the problem of reflector location ambiguity is often encountered in the conventional offset-domain common image gathers (CIGs). Angle-domain CIGs have been proposed as a solution to this problem and become a natural choice for velocity analysis, AVA and true amplitude migration/imaging. The development of wave-theory based seismic migration and imaging methods provides reliable ways for the construction of angle-domain CIGs of high quality. In particular, the beamlet-domain wavefield extrapolation and migration method, in which both the wavefield decomposition functions and the extrapolation propagators bear localization properties in both space and direction, has been proved to be an effective tool for angle-related studies. In this paper, beamlet prestack depth migration based on Gabor-Daubechies frame decomposition is used for angle-domain imaging. Through different stack procedures, both common reflection-angle image gathers (CRAIG) and common dip-angle image gathers (CDAIG) are constructed from the local angle image matrices. As a numerical example, the CRAIGs and CDAIGs for the SEG-EAGE 2D salt model are calculated and analyzed. Based on their distinct features, the applications of these two CIGs to seismic imaging are discussed in detail. |
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| Keywords: | Gabor-Daubechies beamlet prestack depth migration Local angle image matrix Common reflection-angle image gather Common dip-angle image gather SEG-EAGE 2D salt model |
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