3D ray+Born migration/inversion—Part 1: Theory
3D ray+Born migration/inversion—Part 1: Theory
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3D 射线+天生偏移/反转—第 1 部分：理论
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
P. Thierry
中科院分区：
文献类型：
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作者：
G. Lambaré;S. Operto;P. Podvin;P. Thierry
叠前射线+Born偏移/反演可分为两步：共成像道集（CIG）的计算和它们的加权叠加（偏移叠加）。CIG的域选择（镜头、偏移、角度等）对偏移叠加的分辨率有直接影响。这种分辨率可以很容易地在射线+Born偏移/反演理论的框架内进行研究，从而根据采集几何结构改进偏移/反演公式。本文致力于这种分析的情况下，一个简单的二维采集和三维条带采集，都对应于经典的数据集从SEG/EAGE三维逆掩实验。我们表明，偏移公式原来设计的三维海洋采集不适用于三维测绘带采集。最后，我们提出了一个新的公式，这种特定的采集，提高了最终偏移图像的分辨率。这个新公式的相关性在配套文件中的SEG/EAGE实验的框架中说明。
Prestack ray+Born migration/inversion can be split in two steps : the computation of common image gathers (CIGs) and their weighted stack (the migration stack). The choice of the domain for the CIGs (shot, offset, angle, etc.) has a direct impact on the resolution of the migration stack. This resolution can be studied easily in the frame of ray+Born migration/inversion theory resulting into improved migration/inversion formulas according to the acquisition geometry. This paper is devoted to this analysis in the cases of a simple 2D acquisition and of a 3D swath acquisition, both corresponding to classical data sets from the SEG/EAGE 3D overthrust experiment. We show that the migration formula originally designed for 3D marine acquisition is not adaptable to the 3D swath acquisition. Finally, we propose a new formula for this specific acquisition, which improves the resolution of the final migrated image. The relevance of this new formula is illustrated in the frame of the SEG/EAGE experiment in the companion paper.