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首页> 外文期刊>Journal of geophysics and engineering >A new fracture detection method based on full-azimuth anisotropic migration and shaping regularization
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A new fracture detection method based on full-azimuth anisotropic migration and shaping regularization

机译：一种基于全方位角各向异性迁移和塑造正规化的新的断裂检测方法

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摘要

Fracture detection plays an important role in oil and gas exploration. Azimuth-dependent amplitude anisotropy is a key indicator for fracture characterization. In order to not only retain the azimuthal information but also preserve the genuine amplitude relationships in the common image gathers, an accurate anisotropic migration algorithm is required. A further complication arises when the migrated seismic data are inverted to determine the fracture properties, specifically the challenge posed by the stability of the Ruger equations. In this paper, we derive a fourth-order travel time equation for orthorhombic media that performs the anisotropic migration in the local angle domain. By introducing a new shaping regulator to the conventional fracture inverse problem, we improved the accuracy and convergence of the algorithm. The proposed migration and inversion approaches have been validated with a synthetic and a real dataset from the Tarim basin. The results of this validation suggest that the proposed workflow leads to better preservation of the azimuthal and anisotropic information in the migrated seismic data. A subsequent inversion of the migrated seismic data results in a higher resolution of the fracture density compared to the conventional singular value decomposition approach.
机译：骨折检测在石油和天然气勘探中起着重要作用。方位依赖性振幅各向异性是用于骨折表征的关键指示器。为了不仅保留方位角信息而且保留在常见图像中的真正幅度关系，需要准确的各向异性迁移算法。当迁移的地震数据被反转以确定裂缝性能时，出现了进一步的并发症，特别是鲁尔方程的稳定性构成的挑战。在本文中，我们推导出对局部角域中的各向异性迁移的正交介质的四阶行进时间方程。通过向传统的骨折逆问题引入新的成型调节器，我们提高了算法的准确性和收敛性。拟议的迁移和反演方法已被塔里木盆地的合成和实际数据集验证。该验证的结果表明，所提出的工作流程导致更好地保存迁移地震数据中的方位角和各向异性信息。与传统的奇异值分解方法相比，迁移的地震数据的随后反转导致裂缝密度的更高分辨率。

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