| 高精度混合法叠前深度偏移及其并行实现 |
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| 引用本文： | 张文生,关泉,宋海斌.高精度混合法叠前深度偏移及其并行实现[J].地球物理学报,2001,44(4):542-551. |
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| 作者姓名： | 张文生 关泉 宋海斌 |
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| 作者单位： | 1. 科学院数学与系统科学研究院,科学与工程计算国家重点实验室,北京100080;
2. 学院地质与地球物理研究所,北京100101 |
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| 基金项目： | 国家自然科学基金项目 ( 40 0 0 4 0 0 3)，国家重点基础研究项目 (G1 9990 32 80 0 ) |
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| 摘 要： | 叠前深度偏移是复杂构造成像的重要手段.本文基于波场分裂理论,首先给出了波场延拓的一般方程,即一个上下行波的耦合方程组.通常所用的波场延拓方程就是该耦合方程组的特例.根据平方根算子的近似,推导了一种新的高精度混合法偏移方法,用分裂法即可进行计算.通过对一个横向强烈变速模型的叠后偏移及Marmousi复杂构造模型的叠前偏移计算,说明了方法的有效性,精度较高.采用MPI并行编程实现并行计算,提高了计算效率.该方法可用于对横向强烈变速的复杂构造的精确成像.
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| 关 键 词： | 波场分裂 混合法 叠前深度偏移 分裂法 MPI并行 |
| 文章编号： | 0001-5733(2001)04-0542-10 |
| 收稿时间： | 2000-09-15 |
PRESTACK DEPTH MIGRATION BY HYBRID METHOD WITH HIGH PRECISION AND ITS PARALLEL IMPLEMENTATION |
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| ZHANG WEN,SHENG,ZHANG GUAN,QUAN.PRESTACK DEPTH MIGRATION BY HYBRID METHOD WITH HIGH PRECISION AND ITS PARALLEL IMPLEMENTATION[J].Chinese Journal of Geophysics,2001,44(4):542-551. |
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| Authors: | ZHANG WEN SHENG ZHANG GUAN QUAN |
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| Institution: | 1. State Key L ab. Of Scientif ic and Engineering Computing , Academy of Mathematics and System Sciences, Chinese Academy of Sciences, Beijing 10080, China;
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: | Prestack depth migration is an important imaging method for complex geological structures. In this paper a generalized system of wavefield continuation is presented based on the wavefield splitting theory. The system is coupled by downgoing and upgoing waves, and the commonly used equation of wavefield continuation is only a special case of the coupled system. Based on the approximation of square root operator, a new hybrid migration method with high precision is derived. The method can be implemented numerically through splitting technique. Finally, two numerical migration examples are given, one is the poststack depth migration for a model with large lateral velocity contrasts, another is the prestack depth migration for Marmousi model with complex structures. The numerical results show the effectiveness and high precision of the method. The MPI parallel calculation is adopted in order to raise computational efficiency. The method can be used to obtain precise images for complex structures with large lateral velocity variations. |
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| Keywords: | Wavefield splitting Hybrid method Prestack depth migration Splitting method MPI parallel |
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