Modelling and analysis of attenuation anisotropy in multi‐azimuth VSP data from the Clair field
Modelling and analysis of attenuation anisotropy in multi‐azimuth VSP data from the Clair field
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DOI：
10.1111/j.1365-2478.2007.00645.x
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发表时间：
2007-09
影响因子：
2.6
通讯作者：
S. Maultzsch;M. Chapman;E. Liu;Xiang-Yang Li
中科院分区：
文献类型：
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作者：
S. Maultzsch;M. Chapman;E. Liu;Xiang-Yang Li
衰减的各向异性变化是令人感兴趣的，因为它们可以给出关于断裂系统的信息，并且可能比绝对衰减值更易于测量。我们研究了从VSP数据中检测相对衰减随方位角变化的方法，并在合成数据上验证了该技术。对来自裂缝油气藏的多方位角离散VSP数据集的分析表明，P波衰减的这种方位角变化是可观察到的。这些影响局限于储层中，并且分析允许预测裂缝走向，这与地质信息一致。在合理的假设下，可以对观察到的效应进行建模，这表明各向异性衰减与压裂之间的联系是有效的。
Anisotropic variations in attenuation are of interest since they can give information on the fracture system and may be more amenable to measurement than absolute attenuation values. We examine methods for detecting changes in relative attenuation with azimuth from VSP data, and validate the techniques on synthetic data. Analysis of a multi‐azimuth walkaway VSP data set from a fractured hydrocarbon reservoir indicates that such azimuthal variations in P‐wave attenuation are observable. The effects are localized in the reservoir, and analysis allows the prediction of a fracture strike direction, which agrees with geological information. The observed effects can be modelled under reasonable assumptions, which suggests the validity of the link between the anisotropic attenuation and the fracturing.