DOI: 10.1002/2016GL069312
论文题名: Compressional wave dispersion due to rock matrix stiffening by clay squirt flow
作者: Ba J. ; Zhao J. ; Carcione J.M. ; Huang X.
刊名: Geophysical Research Letters
ISSN: 0094-9645
EISSN: 1944-9376
出版年: 2016
卷: 43, 期: 12 起始页码: 6186
结束页码: 6195
语种: 英语
英文关键词: acoustic properties
; clay squirt flow
; elasticity and anelasticity
; P wave dispersion
; submicrostructures
; wave propagation
Scopus关键词: Acoustic properties
; Acoustic wave propagation
; Acoustic wave velocity
; Acoustics
; Flow of fluids
; Forecasting
; Microporosity
; Porosity
; Rocks
; Seismic waves
; Velocity
; Wave propagation
; Compressional wave velocity
; Elasticity and anelasticity
; Mechanical equilibrium
; P waves
; Saturation conditions
; Squirt flow
; Submicrostructures
; Ultrasonic experiments
; Dispersion (waves)
英文摘要: The standard Biot-Gassmann theory of poroelasticity fails to explain strong compressional wave velocity dispersion experimentally observed in 12 tight siltstone with clay-filled pores. In order to analyze and understand the results, we developed a new double-porosity model of clay squirt flow where wave-induced local fluid flow occurs between the micropores in clay aggregates and intergranular macropores. The model is validated based on the combined study of ultrasonic experiments on specimens at different saturation conditions and theoretical predictions. The presence of a sub-pore-scale structure of clay micropores contained in intergranular macropores, where the fluid does not have enough time to achieve mechanical equilibrium at ultrasonic frequencies and thus stiffens the rock matrix, provides a suitable explanation of the experimental data. Moreover, the model provides a new bound for estimating the compressional wave velocity of tight rocks saturated with two immiscible liquids. The theoretical predictions indicate that the velocity variation between gas- and liquid-saturated specimens is predominantly induced by the clay squirt stiffening effect on the rock matrix and not by fluid substitution. The effect contributes more than 90% to the variation in the porosity range of 0–5%. Thus, clay squirt flow dominates the relationships between compressional wave velocity and pore fluid in tight rocks. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977507756&doi=10.1002%2f2016GL069312&partnerID=40&md5=6a469cd6600f4d34bb77fb97a4a26b55
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10608
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Earth Science and Engineering, Hohai University, Nanjing, China
Recommended Citation:
Ba J.,Zhao J.,Carcione J.M.,et al. Compressional wave dispersion due to rock matrix stiffening by clay squirt flow[J]. Geophysical Research Letters,2016-01-01,43(12).