Multicomponent Prestack Depth Migration
Multicomponent Prestack Depth Migration
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DOI：
10.1190/1.1822300
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发表时间：
1993
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影响因子：
--
通讯作者：
Toru Takahashi
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文献类型：
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作者：
Toru Takahashi
当叠前深度偏移应用于真实数据时，由于有限的观测几何形状而导致的偏移伪影或假图像通常使得偏移图像的解释变得困难。为了减少偏移图像中的这种不需要的伪影，我在这里建议将从多分量数据获得的接收点处散射波的入射角或偏振方向的信息合并到偏移中波场的外推中。在该方法中，在接收点聚焦于其入射方向的方向上推断散射波的给定到达，以创建更正确的偏移图像。数值算例表明，与使用单分量数据的偏移相比，本文提出的多分量偏移可以大大减少由于观测几何形状有限而导致的偏移伪影或虚假图像，并提供更正确、更可靠的地下图像。
When prestack depth migration is applied to real data, migration artifacts or false images due to limited observation geometry often make it difficult to interpret the migrated images. To reduce such unwanted artifacts in migration images, I propose here that information about incident angles or polarization directions of scattered waves at a receiving point obtained from multi-component data be incorporated into the extrapolation of wavefields in migration. In this method, a given arrival of a scattered wave is extrapolated in the direction focused on its incident direction at a receiving point to create a more correct migration image. Numerical examples show that by comparison with the migration that uses single-component data, the multi-component migration presented here can largely decrease migration artifacts or false images due to limited observation geometry and provide more correct and reliable subsurface images.