Diffraction Amplitude for Fractures Imaging & Hydrocarbon Prediction

Y. Bashir, D. Ghosh, C. Sum
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引用次数: 3

Abstract

Seismic diffractions are often considered as noise and have been suppressed during processing intentionally or implicitly. Diffraction hyperbola actually have the information of discontinuity such as fault, fracture, Karst and edge of salt flanks, which always contain valuable information for geological interpretation and reservoir modeling. These diffractions play an important role to illuminate the small scale events which are crucial for structural traps such as fractured reservoir. Another important part of diffraction is to improve the amplitude recovery at the certain point through diffraction summation. These diffracted waves have been recognized as physically reliable carriers of high and even super-resolution structural information. This research work illustrates the different behavior of diffraction hyperbola comparing with different velocities and depths. Phase change in amplitude in 180 0 from +ive to –ive and the decay in amplitudes directly proportional to the angle of incident. Synthetic data set is used for the analysis of amplitude preservation through diffraction imaging. Outcome of the research demonstrate the consideration of diffraction imaging for discontinuities, complex structure and small scale reservoir imaging, which subsidize a good impact to search the hydrocarbon potential reserves. Another aspect is cover that describes the importance of migration aperture selection for integration of the diffractions on the basis of frequency of the data, as high frequency will produce less diffraction response then low frequency. Last but not least, the diffraction imaging improves the spatial resolution of individual faults and fracture below the resolution of reflections.
裂缝衍射振幅成像与油气预测
地震衍射常被认为是噪声,在处理过程中有意或无意地加以抑制。衍射双曲线实际上包含断层、裂缝、岩溶和盐侧边缘等不连续信息,为地质解释和储层建模提供了宝贵的信息。这些衍射对揭示裂缝性储层等构造圈闭的小尺度事件具有重要作用。衍射的另一个重要部分是通过衍射求和来提高某一点的振幅恢复。这些绕射波已被认为是高分辨率甚至超分辨率结构信息的物理可靠载体。本研究工作说明了衍射双曲线在不同速度和深度下的不同行为。180年从+ive到-ive的振幅相位变化,振幅衰减与入射角成正比。利用合成数据集对衍射成像的保幅性进行分析。研究结果表明,衍射成像对不连续面、复杂构造和小尺度储层成像的考虑,对寻找油气潜在储量具有良好的影响。另一个方面是描述基于数据频率的衍射积分的偏移孔径选择的重要性,因为高频比低频产生更少的衍射响应。最后,衍射成像提高了单个断层和裂缝在反射分辨率以下的空间分辨率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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