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Imaging Fracture Zones at Eleven-Mile Canyon Using Anisotropic Least-Squares Reverse-Time Migration

机译:使用各向异性最小二乘反向时间迁移,在11英里峡谷成像骨折区域

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Accurate imaging of fracture zones is crucial for geothermal energy exploration. Fracture zones and most geologic formations behave as anisotropic media for seismic-wave propagation. Properly accounting for subsurface anisotropic properties is essential for high-resolution imaging of fracture/fault zones for geothermal exploration. We develop a novel anisotropic least-squares reverse-time migration method for reliable imaging of fracture zones. The method employs an efficient implicit wavefield-separation scheme to reduce image artifacts and improve the image quality. We verify the capability of our new imaging method using synthetic data for a geophysical model of the Eleven-Mile Canyon site in Nevada containing several fracture/fault zones. We apply our new method to seismic data acquired along five 2D lines at Eleven-Mile Canyon for geothermal energy exploration. Our imaging results demonstrate that our new anisotropic least-squares reverse-time migration improves image resolution and reduces image artifacts.
机译:骨折区域的准确成像对于地热能勘探至关重要。骨折区域和大多数地质地层表现为地震波传播的各向异性介质。适当核算地下各向异性特性对于地热勘探的裂缝/断层区的高分辨率成像至关重要。我们开发了一种新的各向异性最小二乘性迁移方法,可用于骨折区域的可靠成像。该方法采用有效的隐式波场分离方案来减少图像伪像并提高图像质量。我们验证了新的成像方法使用含有多个骨折/断层区域的内华达州11英里峡谷网站的地球物理模型的合成数据。我们将新方法应用于沿110D线在11英里峡谷获得的地震数据进行地震数据,用于地热能勘探。我们的成像结果表明,我们的新的各向异性最小二乘迁移改善了图像分辨率并减少了图像伪影。

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