Elasticity of marine sediments: Rock physics modeling
Elasticity of marine sediments: Rock physics modeling
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DOI：
10.1029/1999gl900332
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发表时间：
1999-06
影响因子：
5.2
通讯作者：
J. Dvorkin;M. Prasad;A. Sakai;D. Lavoie
中科院分区：
文献类型：
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作者：
J. Dvorkin;M. Prasad;A. Sakai;D. Lavoie
我们为高孔隙度海底沉积物的弹性模量提供了一个有效的介质模型。干沉积物框架的弹性常数取决于孔隙率、固相的弹性模量和有效压力。该模型在弹性模量-孔隙率平面中连接两个端点：临界孔隙率下致密弹性球包的赫兹-明德林模量;以及100%孔隙率下的零。饱和泥沙的弹性模量由干框架的弹性模量用Gassmann方程计算。与悬浮模型不同，我们的模型为干沉积物框架分配了非零弹性常数，可以预测剪切波速。与旅行时间平均方程的各种修改不同，它是基于第一原理的，只包含物理参数。我们证明这个模型匹配声波数据在浅海沉积物和ODP井。
We offer an effective medium model for the elastic moduli of high‐porosity ocean‐bottom sediments. The elastic constants of the dry‐sediment frame depend on porosity, elastic moduli of the solid phase, and effective pressure. The model connects two end points in the elastic‐modulus‐porosity plane: the Hertz‐Mindlin modulus of a dense elastic sphere pack at critical porosity; and zero at 100% porosity. The elastic moduli of saturated sediment are calculated from those of the dry frame using Gassmann's equation. Unlike the suspension model, our model assigns non‐zero elastic constants to the dry‐sediment frame and can predict the shear‐wave velocity. Unlike various modifications of the travel‐time‐average equation, it is first‐principle‐based and contains only physical parameters. We justify this model by matching sonic data in shallow marine sediments and in an ODP well.