气候变化领域集成服务门户(CCPortal): Dispersion and Attenuation of Elastic Wave Velocities: Impact of Microstructure Heterogeneity and Local Measurements

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DOI	10.1029/2020JB020132
	Dispersion and Attenuation of Elastic Wave Velocities: Impact of Microstructure Heterogeneity and Local Measurements
	Sun C.; Tang G.; Fortin J.; Borgomano J.V.M.; Wang S.
发表日期	2020
ISSN	21699313
卷号	125 期号:12
英文摘要	The variation of the seismic properties with frequency of a brine-saturated sandstone sample with a porosity of 22% was measured using a forced oscillation apparatus. Two pairs of orthogonal biaxial strain gauges were pasted at different locations at the length center of the sample. In the frequency range of 1–300 Hz, using these two pairs of strain gauges, we observed experimentally the same global flow but different local flows (squirt flow). Therefore, the observation of the local flow is influenced by the position of the strain gauges in contrast to the global flow. Indeed, local flow is strongly influenced by the microstructure (structure of the grain contacts and microcracks). In particular, we show that although the sample is homogeneous in terms of porosity and crack density, it is not the case in terms of crack aspect ratio, which may slightly vary along the sample. A 3D diffusion model coupled with a simple squirt model was built to further interpret the data. These results show that the wave-induced fluid flows occur at different scales and controls the dispersion and attenuation of saturated rocks. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	attenuation; dispersion; dual-scale fluid-flow model; global flow and local flow; low-frequency measurement; seismic properties
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/187439
作者单位	State Key Laboratory of Petroleum Resources and Prospecting; Key Laboratory of Geophysical Prospecting, CNPC, China University of Petroleum, Beijing, China; Laboratoire de Géologie, UMR8538, Ecole Normale Supérieure/CNRS, PSL Research University, Paris, France
推荐引用方式 GB/T 7714	Sun C.,Tang G.,Fortin J.,et al. Dispersion and Attenuation of Elastic Wave Velocities: Impact of Microstructure Heterogeneity and Local Measurements[J],2020,125(12).
APA	Sun C.,Tang G.,Fortin J.,Borgomano J.V.M.,&Wang S..(2020).Dispersion and Attenuation of Elastic Wave Velocities: Impact of Microstructure Heterogeneity and Local Measurements.Journal of Geophysical Research: Solid Earth,125(12).
MLA	Sun C.,et al."Dispersion and Attenuation of Elastic Wave Velocities: Impact of Microstructure Heterogeneity and Local Measurements".Journal of Geophysical Research: Solid Earth 125.12(2020).