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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Enhancing Subsurface Scatters Using Reflection-Damped Plane-Wave Least-Squares Reverse Time Migration
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Enhancing Subsurface Scatters Using Reflection-Damped Plane-Wave Least-Squares Reverse Time Migration

机译：使用反射衰减平面波最小二乘反向时间迁移增强地下散流

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摘要

Subsurface scatters are sometimes masked by reflectors in seismic migration images, because the diffractions are much weaker in energy than the reflections. We propose a novel imaging method, named reflection-damped plane-wave least-squares reverse time migration (RD_PLSRTM), to enhance the scatters in the migration image. We formulate seismic imaging as an inverse problem that minimizes a weighted residual between the modeled and observed seismic data. In the proposed approach, we use the plane-wave destruction filter to separate the diffractions from the reflections in the data residual. A reflection-damped weighting matrix is then used to govern the fitting of the diffractions and the reflections, and therefore emphasize the updates of the scatters. The inverse problem is finally solved by using an iteratively reweighted least-squares (IRLS) algorithm. The proposed method provides a generalized formulation that could be reduced to conventional PLSRTM and PLSRTM of diffractions (PLSRTM_D) by using specific damping factors. We conduct imaging tests on synthetic and field data that prove the superiority of the proposed method over PLSRTM in imaging deep scatters and subsalt scatters. Compared with PLSRTM_D, it could produce high-quality images of not only the scatters but also the reflectors.
机译：地下散射有时被震动迁移图像中的反射器掩盖，因为衍射在能量中比反射较弱。我们提出了一种新颖的成像方法，命名为反射衰减平面波最小二乘反转时间迁移（RD_PLSRTM），以增强迁移图像中的散流度。我们将地震成像作为逆问题，最小化建模和观测的地震数据之间的加权残留。在所提出的方法中，我们使用平面波破坏滤波器将衍射与数据残差中的反射分离。然后使用反射抑制的加权矩阵来控制衍射和反射的拟合，因此强调散流的更新。最终通过使用迭代重新重量的最小二乘（IRLS）算法来解决逆问题。所提出的方法提供了通过使用特定阻尼因子来减少到常规PLSRTM和PLSRTM的常规PLSRTM和PLSRTM的一般性制剂。我们对综合性和现场数据进行成像测试，该数据证明提出的方法在PLSRTM中的成像深度散击和Subsalt Scatters上的优势。与PLSRTM_D相比，它可以产生不仅产生散流的高质量图像，还可以产生反射器。

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