Crosshole ground-penetrating radar (GPR) is applied in areas that require a very detailed subsurface characterization. Analysis of such data typically relies on tomographic inversion approaches providing an image of subsurface parameters. We have developed an approach for processing the reflected energy in crosshole GPR data and applied it on GPR data acquired in different sedimentary settings. Our approach includes muting of the first arrivals, separating the up- and the downgoing wavefield components, and backpropagating the reflected energy by a generalized Kirchhoff migration scheme. We obtain a reflection image that contains information on the location of electromagnetic property contrasts, thus outlining subsurface architecture in the interborehole plane. In combination with velocity models derived from different tomographic approaches, these images allow for a more detailed interpretation of subsurface structures without the need to acquire additional field data. In particular, a combined interpretation of the reflection image and the tomographic velocity model improves the ability to locate layer boundaries and to distinguish different subsurface units. To support our interpretations of our field data examples, we compare our crosshole reflection results with independent information, including borehole logs and surface GPR data.

中文翻译：

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具有探地雷达数据的井间反射成像：在近地表沉积环境中的应用

跨孔探地雷达（GPR）用于需要非常详细的地下特征分析的区域。对此类数据的分析通常依赖于层析成像反演方法，该方法可提供地下参数的图像。我们已经开发出一种方法来处理井间GPR数据中的反射能量，并将其应用于在不同沉积环境下采集的GPR数据。我们的方法包括使首次到达的信号静噪，分离上行和下行波场分量以及通过广义的Kirchhoff迁移方案反向传播反射能量。我们获得的反射图像包含有关电磁特性对比位置的信息，从而概述了井眼平面中的地下构造。结合从不同层析成像方法得出的速度模型，这些图像可以对地下结构进行更详细的解释，而无需获取其他现场数据。特别地，反射图像和层析速度模型的组合解释提高了定位层边界和区分不同地下单元的能力。为了支持我们对现场数据示例的解释，我们将井间反射结果与独立信息进行比较，包括井眼测井和地面GPR数据。