Seismic attenuation from 3‐D heterogeneities: A possible resolution of the VSP attenuation paradox
Seismic attenuation from 3‐D heterogeneities: A possible resolution of the VSP attenuation paradox
复制标题
3-D 不均匀性引起的地震衰减：VSP 衰减悖论的可能解决方案
DOI：
10.1190/1.1822692
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
G. A. Gist
中科院分区：
文献类型：
--
作者：
G. A. Gist
地震衰减主要由不均匀性的散射决定。对于典型地震场数据的条件，预计吸收衰减机制很小。以前的地震数据散射衰减模型使用层状地层学的一维模型。描述了一种新的散射衰减 3-D 模型，该模型考虑了横向异质性，例如床厚度的变化。该方法可以包括分形相关性，已知分形相关性可以很好地表示测井曲线中的非均质性。与 1-D 模型相比，3-D 散射模型增加了波衰减和总速度色散。地震数据和声波测井之间的典型速度离散可以通过分形相关的 3-D 异质性的散射来解释。 3-D 散射模型预测速度和衰减都是各向异性的。
Seismic attenuation is dominated by scattering from heterogeneities. Absorption attenuation mechanisms are expected to be small for the conditions of typical seismic field data. Previous models of scattering attenuation in seismic data used a 1-D model of layered stratigraphy. A new 3-D model of scattering attenuation is described that accounts for lateral heterogeneities, such as variations in bed thickness. The method can include fractal correlations that are known to provide a good representation of heterogeneities in well logs. The 3-D scattering model increases both wave attenuation and the total velocity dispersion compared to 1-D models. The typical velocity dispersion between seismic data and sonic logs can be accounted for by scattering from fractally correlated 3-D heterogeneities. The 3-D scattering model predicts that both velocity and attenuation are anisotropic.