气候变化领域集成服务门户(CCPortal): Wave Propagation in Infinituple-Porosity Media

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DOI	10.1029/2020JB021266
	Wave Propagation in Infinituple-Porosity Media
	Zhang L.; Ba J.; Carcione J.M.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	The fractal texture (or fabric) of porous media, which supports fluid flow at different scales, is the main cause of wave anelasticity (dispersion and attenuation) on a wide range of frequencies. To model this phenomenon, we develop a theory of wave propagation in a fluid saturated infinituple-porosity media containing inclusions at multiple scales, based on the differential effective medium (DEM) theory of solid composites and Biot-Rayleigh theory for double-porosity media. The dynamical equations are derived from first principles, that is, based on the strain (potential), kinetic, and dissipation energies, leading to generalized stiffness and density coefficients. The scale of the inclusions can be characterized by different distributions. The theory shows that the anelasticity depends on the size (radius) of the inclusions, parameter θ (exponential distribution), mean radius r0 and variance σr2 (Gaussian distribution) and the fractal dimension Df (self-similar distribution). When Df = 2, θ = 1 and σr2 = 4, the three distributions give the same P-wave velocities and attenuation, since each added inclusion phase has nearly the same volume fraction. For the modeling results, the range of anelasticity of Df = 2.99/θ = 1/σr2 = 4 is broader than that of Df < 2.99/θ < 1/σr2 < 4. To confirm the validity of the model, we compare the results with laboratory measurements on tight sandstone and carbonate samples in the range 1 Hz–1 kHz, Fox Hill sandstone (5 Hz–800 kHz) and field measurements of marine sediments (50 Hz–400 kHz). This comparison shows that the model successfully describes the observed anelasticity. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	dispersion; fractal porous media; infinituple-porosity media; random porous media; wave anelasticity; wave propagation equation
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187248
作者单位	School of Earth Sciences and Engineering, Hohai University, Nanjing, China; National Institute of Oceanography and Applied Geophysics – OGS, Trieste, Italy
推荐引用方式 GB/T 7714	Zhang L.,Ba J.,Carcione J.M.. Wave Propagation in Infinituple-Porosity Media[J],2021,126(4).
APA	Zhang L.,Ba J.,&Carcione J.M..(2021).Wave Propagation in Infinituple-Porosity Media.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Zhang L.,et al."Wave Propagation in Infinituple-Porosity Media".Journal of Geophysical Research: Solid Earth 126.4(2021).