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首页> 外文期刊>Exploration Geophysics >A modified excitation amplitude imaging condition for prestack reverse time migration
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A modified excitation amplitude imaging condition for prestack reverse time migration

机译：叠前逆时偏移的改进激发振幅成像条件

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摘要

In wave-equation-based migration, the imaging condition is an important factor that impacts migration accuracy and efficiency. Among the commonly used imaging conditions, the excitation amplitude imaging condition has high resolution, accuracy and low storage and input/output burden when compared with others. However, the excitation amplitude extracted by this imaging condition in its current form will produce a distorted migration image for certain scenarios. In this paper, a modified excitation amplitude imaging condition is proposed that addresses the above problem and produces migrated images free from distortion for complicated geologic models. In this paper, we propose a method to effectively use the modified shortest path method (MSPM) for extracting the maximum amplitude around the first-arrival events. Then, the excitation amplitude imaging condition is applied to obtain a continuous and clear migration image. This process can, to some extent, improve the distorted migration image produced by the traditional excitation amplitude imaging condition. Some numerical tests with synthetic data of Sigsbee2a and Marmousi-II models show that the improvement is feasible and effective in complex-structure media.
机译：在基于波动方程的偏移中，成像条件是影响偏移精度和效率的重要因素。在常用的成像条件中，与其他相比，激发振幅成像条件具有高分辨率，准确性和低存储和输入/输出负担。但是，此成像条件以当前形式提取的激发幅度在某些情况下会产生变形的偏移图像。在本文中，提出了一种修改后的激发振幅成像条件，该条件解决了上述问题并针对复杂的地质模型产生了不失真的迁移图像。在本文中，我们提出了一种方法，可以有效地使用改进的最短路径方法（MSPM）提取首次到达事件周围的最大振幅。然后，施加激发振幅成像条件以获得连续且清晰的迁移图像。该过程可以在一定程度上改善由传统激发振幅成像条件产生的失真的迁移图像。使用Sigsbee2a和Marmousi-II模型的综合数据进行的一些数值测试表明，该改进在复杂结构介质中是可行和有效的。

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