| The Offset-Domain Prestack Depth Migration with Optimal Separable Approximation |
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| 作者姓名： | 张致付 刘春园 张春涛 孟小红 |
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| 作者单位： | Key Laboratory of Geo-detection (China University of Geosciences Beijing) Ministry of Education，State Key Laboratory of Geological Processes and Mineral Resources，China University of Geosciences，Beijing 100083，China，School of Geophysics and Information Technology，China University of Geosciences，Beijing 100083，China，School of Natural Resources and Information Technology，China University of Petroleum，School of Natural Resources and Information Technology，China University of Petroleum，Key Laboratory of Geo-detection (China University of Geosciences Beijing) Ministry of Education，State Key Laboratory of Geological Processes and Mineral Resources，China University of Geosciences，Beijing 100083，China，School of Geophysics and Information Technology，China University of Geosciences，Beijing 100083，China，Beijing 100083，China，Beijing 102249，China，Beijing 102249，China，Beijing 100083，China |
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| 基金项目： | This paper is supported by the National Natural Science Foundation of China (No. 40474047)，State Key Laboratory of Geological Processes and Mineral Resources (No. GPMR200654)，the Focused Subject Program of Beijing (No. XK104910598). |
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| 摘 要： | The offset-domain prestack depth migration with optimal separable approximation, based on the double square root equation, is used to image complex media with large and rapid velocity variations. The method downward continues the source and the receiver wavefields simultaneously. The mixed domain algorithm with forward Fourier and inverse Fourier transform is used to construct the double square root equation wavefield extrapolation operator. This operator separates variables in the wave number domain and variables in the space domain. The phase operation is implemented in the wave number domain, whereas the time delay for lateral velocity variation is corrected in the space domain. The migration algorithm is efficient since the seismic data are not computed shot by shot. The data set test of the Marmousi model indicates that the offset-domain migration provides a satisfied seismic migration section on which complex geologic structures are imaged in media with large and rapid lateral velocity variations.
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| 关 键 词： | 平方根 近似值 偏移距 地质学 |
| 收稿时间： | 2007-06-21 |
| 修稿时间： | 2007-09-15 |
The Offset-Domain Prestack Depth Migration with Optimal Separable Approximation |
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| Zhang Zhifu,Liu Chunyuan,Zhang Chnutao,Meng Xiaohong.The Offset-Domain Prestack Depth Migration with Optimal Separable Approximation[J].Journal of China University of Geosciences,2007,18(4):350-356. |
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| Authors: | Zhang Zhifu Liu Chunyuan Zhang Chnutao Meng Xiaohong |
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| Institution: | 1. Key Laboratory of Geo-detection (China University of Geosciences, Beijing), Ministry of Education,Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China
2. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The offset-domain prestack depth migration with optimal separable approximation, based on the double square root equation, is used to image complex media with large and rapid velocity variations. The method downward continues the source and the receiver wavefields simultaneously. The mixed domain algorithm with forward Fourier and inverse Fourier transform is used to construct the double square root equation wavefield extrapolation operator. This operator separates variables in the wave number domain and variables in the space domain. The phase operation is implemented in the wave number domain, whereas the time delay for lateral velocity variation is corrected in the space domain. The migration algorithm is efficient since the seismic data are not computed shot by shot. The data set test of the Marmousi model indicates that the offset-domain migration provides a satisfied seismic migration section on which complex geologic structures are imaged in media with large and rapid lateral velocity variations. |
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| Keywords: | double square root equation optimal separable approximation prestack depth migration |
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