| τ-P域地震资料三维叠前深度偏移及其实用算法 |
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| 引用本文： | 贺振华,陈志文.τ-P域地震资料三维叠前深度偏移及其实用算法[J].地球物理学报,1997,40(2):257-264. |
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| 作者姓名： | 贺振华 陈志文 |
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| 作者单位： | 成都理工学院信息工程与应用地球物理系, 成都 610059 |
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| 基金项目： | “油气藏地质与开发工程国家重点实验室”资助 |
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| 摘 要： | 本文提出了在τ-P域实现三维叠前深度偏移的计算方法，该方法把地震道集由时-空域变换到τ-P域，然后对共P数据体进行相移或相移加插值偏移，将偏移后的各共P数据体叠加得到叠前深度偏移结果．该算法能够实现陡倾地层的正确归位，降低偏移处理维数，减少计算机内存需求，易于并行处理，但是计算量和所花费的计算机时间仍然很大．为此我们又提出了针对目的层的分时（层）偏移方法，由于只考虑目的层，可节省大量的计算时间．文中以二维实际地震资料及三维数值模型资料的处理说明了上述方法的可行性与有效性．
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| 关 键 词： | 叠前偏移 分时（层）方法 τ-P域 并行处理 |
| 收稿时间： | 1995-08-22 |
3D PRE-STACK DEPTII MIGRATION OF SEISMIC DATA INτ-P DOMAIN AND IT'S FAST IMPLEMENTATION |
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| HE ZHEN-HUA, CHEN ZHI-WEN, XIONG XIAO-BING.3D PRE-STACK DEPTII MIGRATION OF SEISMIC DATA INτ-P DOMAIN AND IT'S FAST IMPLEMENTATION[J].Chinese Journal of Geophysics,1997,40(2):257-264. |
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| Authors: | HE ZHEN-HUA CHEN ZHI-WEN XIONG XIAO-BING |
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| Institution: | Chengdu, Institute of Technology, Information and Geophysics, Chengdu 610059, China |
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| Abstract: | A method of 3D pre-stack depth migration in τ-P domain is introduced in this paper, by which the seismic data set is transformed from time-space domain into τ-P domain, then each sorted common-P data set is imaged using phase shift ndgration or phase shift plus interpolation migrati0n, and finally, the section of pre-stack depth migration is obtained by stacking all ndgrated common-P data sets. This method that is suited to imaging structures with steep dips and strong velocity contrasts correctly and precisely reduces dimenssion of migration processing, decreases requlrement of computer memory capacity, and is easy to run using parallel processing. However, time costs may be huge for practical data processing. We have developed a timelimiting (lnyer-limitingl method that includes a fast, efficient algorithm for ndgration processing of lindted times or layers of interest, and saves large amounts of calculation time. It's efflciency and possibility have been tested on 2D seismic real data and 3D numerical data. |
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| Keywords: | Pre-stack drigration Time-lindting （layer-liAnting） method τ-P domain Parallel processing |
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