Seismic attenuation in porous rocks with random patchy saturation
Seismic attenuation in porous rocks with random patchy saturation
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DOI：
10.1111/j.1365-2478.2007.00644.x
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发表时间：
2007-09
影响因子：
2.6
通讯作者：
J. Toms;Tobias Malte Müller;B. Gurevich
中科院分区：
文献类型：
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作者：
J. Toms;Tobias Malte Müller;B. Gurevich
具有两种流体的混合物的多孔岩石的饱和度对地震波传播具有实质性影响。特别地，由于波致流体流动的机制，部分饱和导致传播波的显著衰减和分散。当通过的波在被不同流体饱和的岩石区域中引起不同的流体压力时，这种流动就产生了。由于介观不均匀性的衰减和色散的大多数模型意味着流体不均匀性以规则的方式分布。然而，最近的实验研究表明，介观非均匀性具有不太理想的分布，并且分布本身影响衰减和色散。基于随机多孔介质中相干波场的近似，我们建立了一个假定流体非均匀性连续分布的模型。由于这种连续随机介质方法假设将存在不同斑块大小的分布，因此预计它更适合于模拟实验数据。我们还展示了如何将随机函数与实验可测参数相关联。
Saturation of porous rocks with a mixture of two fluids has a substantial effect on seismic‐wave propagation. In particular, partial saturation causes significant attenuation and dispersion of the propagating waves due to the mechanism of wave‐induced fluid‐flow. Such flow arises when a passing wave induces different fluid pressures in regions of rock saturated by different fluids. Most models of attenuation and dispersion due to mesoscopic heterogeneities imply that fluid heterogeneities are distributed in a regular way. However, recent experimental studies show that mesoscopic heterogeneities have less idealized distributions and that the distribution itself affects attenuation and dispersion. Based on an approximation for the coherent wavefield in random porous media, we develop a model which assumes a continuous distribution of fluid heterogeneities. As this continuous random media approach assumes that there will be a distribution of different patch sizes, it is expected to be better suited to modelling experimental data. We also show how to relate the random functions to experimentally measurable parameters.