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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Elastic wave velocities and permeability of cracked rocks
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Elastic wave velocities and permeability of cracked rocks

机译：裂隙岩石的弹性波速度和渗透率

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摘要

Cracks play a major role in most rocks submitted to crustal conditions. Mechanically, cracks make the rock much more compliant. They also make it much easier for fluid to flow through any rock body. Relying on Fracture Mechanics and Statistical Physics, we introduce a few key concepts, which allow to understand and quantify how cracks do modify both the elastic and transport properties of rocks. The main different schemes, which can be used to derive the elastic effective moduli of a rock, are presented. It is shown from experimental results that an excellent approximation is the so-called non-interactive scheme. The main consequences of the existence of cracks on the elastic waves is the development of elastic anisotropy (due to the anisotropic distribution of crack orientations) and the dispersion effect (due to microscopic local fluid flow). At a larger scale, macroscopic fluid flow takes place through the crack network above the percolation threshold. Two macroscopic fluid flow regimes can be distinguished: the percolative regime close to the percolation threshold and the connected regime well above it. Experimental data on very different rock types show both of these behaviors. (C) 2003 Elsevier B.V All rights reserved. [References: 46]
机译：在大多数受地壳条件影响的岩石中，裂缝起主要作用。在机械上，裂缝使岩石更加柔顺。它们还使流体更容易流过任何岩石体。依靠断裂力学和统计物理学，我们介绍了一些关键概念，这些概念使您能够理解和量化裂缝如何改变岩石的弹性和传输特性。提出了可用于导出岩石弹性有效模量的主要不同方案。从实验结果表明，一个很好的近似是所谓的非交互方案。弹性波上裂纹的存在的主要后果是弹性各向异性的发展（由于裂纹取向的各向异性分布）和分散效应（由于微观的局部流体流动）。在更大的范围内，宏观的流体流动会发生在渗透阈值以上的裂缝网络中。可以区分两种宏观的流体流态：靠近渗流阈值的渗流态和远高于渗流阈值的连通态。关于非常不同的岩石类型的实验数据显示了这两种行为。 （C）2003 Elsevier B.V保留所有权利。 [参考：46]

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