问:回顾

IF 4.9 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
José M. Carcione, Francesco Mainardi, Ayman N. Qadrouh, Mamdoh Alajmi, Jing Ba
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引用次数: 0

摘要

品质因数 Q 是衡量波场每周期能量损失的无量纲指标,正确理解这一因子在地震学、地球物理勘探和电气科学等多个领域都非常重要。这里的重点是粘弹性。在解释实验值时,必须考虑几个因素,特别是介质的形状(杆、棒或无约束介质)以及测量是针对静止模式还是传播模式这一事实。从理论角度来看,由于定义不同、空间维度和波的不均匀性(即传播(或波长)和衰减的矢量并不指向同一方向),Q 值的表达式可能会有所不同。我们展示了时间 Q 值和空间 Q 值之间的区别、压缩 Q 值和剪切 Q 值之间的关系、对频率的依赖性、孔隙-粘弹性和各向异性的情况、不均匀波和各种损耗机制的影响,并考虑了弹性波和电磁波之间的类比。我们讨论了描述弛豫峰值的物理理论、Q 值的界限以及显示 Q 值作为频率、饱和度和孔隙压力函数的行为的实验。最后,我们提出了一个应用实例,Q 值可用于估算孔隙度和饱和度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Q: A Review

Q: A Review

Q: A Review

The quality factor Q is a dimensionless measure of the energy loss per cycle of a wave field, and a proper understanding of this factor is important in a variety of fields, from seismology, geophysical prospecting to electrical science. Here, the focus is on viscoelasticity. When interpreting experimental values, several factors must be taken into account, in particular the shape of the medium (rods, bars or unbounded media) and the fact that the measurements are made on stationary or propagating modes. From a theoretical point of view, the expressions of Q may differ due to different definitions, the spatial dimension and the inhomogeneity of the wave, i.e. the fact that the vectors of propagation (or wavenumber) and attenuation do not point in the same direction. We show the difference between temporal and spatial Q, the relationships between compressional and shear Q, the dependence on frequency, the case of poro-viscoelasticity and anisotropy, the effect of inhomogeneous waves and various loss mechanisms, and consider the analogy between elastic and electromagnetic waves. We discuss physical theories describing relaxation peaks, bounds on Q and experiments showing the behaviour of Q as a function of frequency, saturation and pore pressure. Finally, we propose an application example where Q can be used to estimate porosity and saturation.

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来源期刊
Surveys in Geophysics
Surveys in Geophysics 地学-地球化学与地球物理
CiteScore
10.00
自引率
10.90%
发文量
64
审稿时长
4.5 months
期刊介绍: Surveys in Geophysics publishes refereed review articles on the physical, chemical and biological processes occurring within the Earth, on its surface, in its atmosphere and in the near-Earth space environment, including relations with other bodies in the solar system. Observations, their interpretation, theory and modelling are covered in papers dealing with any of the Earth and space sciences.
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