气候变化领域集成服务门户(CCPortal): Frequency-Dependent P Wave Anisotropy Due to Wave-Induced Fluid Flow and Elastic Scattering in a Fluid-Saturated Porous Medium With Aligned Fractures

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DOI	10.1029/2020JB020320
	Frequency-Dependent P Wave Anisotropy Due to Wave-Induced Fluid Flow and Elastic Scattering in a Fluid-Saturated Porous Medium With Aligned Fractures
	Guo J.; Gurevich B.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Seismic anisotropy is an important attribute for fracture detection and characterization. If fracture size is comparable to the wavelength or fluid diffusion length, the P wave anisotropy is frequency dependent. By solving the Biot's equations of dynamic poroelasticity and using the Foldy approximation, we investigate the frequency-dependent P wave anisotropy in a fluid-saturated porous rock with a set of aligned penny-shaped fractures. This approach includes the effects of both wave-induced fluid flow (WIFF) and elastic scattering on P wave anisotropy. The results show that the velocity and attenuation anisotropy in the WIFF and elastic scattering regimes have quite different features and are affected by various factors. In particular, the background permeability and fluid viscosity primarily affect the frequency-dependent anisotropy caused by WIFF. The fracture geometry (radius and thickness) and fracture density have significant effects on both WIFF and elastic scattering-induced frequency-dependent anisotropy. The fluid bulk modulus also affects the frequency-dependent anisotropy. With the vanishing fluid bulk modulus, the frequency dependency vanishes in the WIFF regime but is the largest in the elastic scattering regime. Predictions of the model agree with previous models in all known limiting cases. Comparison with experimental data shows that WIFF and elastic scattering are important causes for frequency-dependent P wave anisotropy, and our model is capable to account for these effects. ©2020. American Geophysical Union. All Rights Reserved.
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/187729
作者单位	Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Centre for Exploration Geophysics, Curtin University, Perth, WA, Australia
推荐引用方式 GB/T 7714	Guo J.,Gurevich B.. Frequency-Dependent P Wave Anisotropy Due to Wave-Induced Fluid Flow and Elastic Scattering in a Fluid-Saturated Porous Medium With Aligned Fractures[J],2020,125(8).
APA	Guo J.,&Gurevich B..(2020).Frequency-Dependent P Wave Anisotropy Due to Wave-Induced Fluid Flow and Elastic Scattering in a Fluid-Saturated Porous Medium With Aligned Fractures.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Guo J.,et al."Frequency-Dependent P Wave Anisotropy Due to Wave-Induced Fluid Flow and Elastic Scattering in a Fluid-Saturated Porous Medium With Aligned Fractures".Journal of Geophysical Research: Solid Earth 125.8(2020).