Angle Gathers by Reverse-time Migration
Angle Gathers by Reverse-time Migration
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DOI：
10.3997/2214-4609.201400670
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
M. Vyas;E. Mobley;D. Nichols;J. Perdomo
中科院分区：
文献类型：
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作者：
M. Vyas;E. Mobley;D. Nichols;J. Perdomo
逆时偏移角道集的计算方法之一是利用时间滞后。其他作者以前已经提出了将时滞转换为角度的算法。然而，所提出的工作流程需要倾角场，并且在具有冲突倾角的区域和倾角大于60度的区域中越来越不准确。在本文中，我们提出的方法来克服倾角的限制，并做角度变换，而不明确使用的倾向领域。所得到的角道集可用于偏移速度分析或叠加改善成像质量。我们使用一个合成的2D模型来比较使用我们提出的方法和传统的工作流程所获得的结果。最后，我们显示了RTM角道集的SEAM模型使用我们的方法。
One of the ways to compute angle gathers for reverse-time migration (RTM) is through time lags. Algorithm for the transformation of time lags to angles has been proposed previously by other authors. However, the proposed workflow requires a dip field and is increasingly inaccurate in areas with conflicting dips and for dips greater than 60-degrees. In this paper we propose methods to overcome the dip limitation and to do the angle transformation without explicitly using the dip field. The angle gathers thus obtained can be used for migration velocity analysis or to improve the image quality through stack. We use a synthetic 2D model to compare results obtained using our proposed methods and the conventional workflow. Finally, we show RTM angle gathers for SEAM model using our methods.