| 复杂地表条件下高斯波束叠前深度偏移(英文) |
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| 引用本文： | 岳玉波,李振春,张平,周学锋,秦宁.复杂地表条件下高斯波束叠前深度偏移(英文)[J].应用地球物理,2010,7(2):143-148. |
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| 作者姓名： | 岳玉波 李振春 张平 周学锋 秦宁 |
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| 作者单位： | |
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| 基金项目： | the National 863 Program of China，the National 973 Program of China，the Graduate Student Innovation Fund of China University of Petroleum (East China) |
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| 摘 要： | 在复杂地表条件的区域,地震数据的采集和处理是一项极大的挑战。虽然可以通过静校正来消除起伏地表的影响,然而当地表高程以及近地表速度剧烈变化时,简单的垂直时移对地震波场造成的畸变会严重降低偏移成像的质量。基于射线的偏移方法可以直接在起伏地表面进行波场的延拓成像,是解决上述问题的有效手段。本文针对复杂地表条件下的高斯波束叠前深度偏移进行研究,对倾斜叠加公式进行修改,使之包含地表高程以及速度的信息,通过直接在复杂地表面进行平面波的合成,得到了一种具有更高成像精度的改进方法。首先简单介绍常规高斯波束偏移的基本原理和计算流程,并以此为基础,给出复杂地表条件下高斯波束偏移原有的实现方法以及本文的改进方法,最后通过模型和实际资料的试算验证本文方法的有效性。
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| 关 键 词： | 复杂地表 局部平面波 高斯波束偏移 |
| 收稿时间： | 17 November 2008 |
Prestack Gaussian beam depth migration under complex surface conditions |
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| Yu-Bo Yue,Zhen-Chun Li,Ping Zhang,Xue-Feng Zhou,Ning Qin.Prestack Gaussian beam depth migration under complex surface conditions[J].Applied Geophysics,2010,7(2):143-148. |
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| Authors: | Yu-Bo Yue Zhen-Chun Li Ping Zhang Xue-Feng Zhou Ning Qin |
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| Institution: | (1) Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA |
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| Abstract: | In areas with a complex surface, the acquisition and processing of seismic data is a great challenge. Although elevation-static
corrections can be used to eliminate the influences of topography, the distortions of seismic wavefields caused by simple
vertical time shifts still greatly degrade the quality of the migrated images. Ray-based migration methods which can extrapolate
and image the wavefields directly from the rugged topography are efficient ways to solve the problems mentioned above. In
this paper, we carry out a study of prestack Gaussian beam depth migration under complex surface conditions. We modify the
slant stack formula in order to contain the information of surface elevations and get an improved method with more accuracy
by compositing local plane-wave components directly from the complex surface. First, we introduce the basic rules and computational
procedures of conventional Gaussian beam migration. Then, we give the original method of Gaussian beam migration under complex
surface conditions and an improved method in this paper. Finally, we validate the effectiveness of the improved method with
trials of model and real data. |
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| Keywords: | complex surface local plane-wave Gaussian beam migration |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
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