Effect of fracture fill on frequency-dependent anisotropy of fractured porous rocks

doi:10.1111/1365-2478.12505

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院页岩气与地质工程重点实验室

	Effect of fracture fill on frequency-dependent anisotropy of fractured porous rocks
	Kong, Liyun 1; Gurevich, Boris 2,3; Zhang, Yan 1; Wang, Yibo 4
刊名	GEOPHYSICAL PROSPECTING
	2017-11-01
卷号	65 期号:6 页码:1649-1661
关键词	Rock physics Attenuation Anisotropy
ISSN号	0016-8025
DOI	10.1111/1365-2478.12505
文献子类	Article
英文摘要	In fractured reservoirs, seismic wave velocity and amplitude depend on frequency and incidence angle. Frequency dependence is believed to be principally caused by the wave-induced flow of pore fluid at the mesoscopic scale. In recent years, two particular phenomena, i.e., patchy saturation and flow between fractures and pores, have been identified as significant mechanisms of wave-induced flow. However, these two phenomena are studied separately. Recently, a unified model has been proposed for a porous rock with a set of aligned fractures, with pores and fractures filled with two different fluids. Existing models treat waves propagating perpendicular to the fractures. In this paper, we extend the model to all propagation angles by assuming that the flow direction is perpendicular to the layering plane and is independent of the loading direction. We first consider the limiting cases through poroelastic Backus averaging, and then we obtain the five complex and frequency-dependent stiffness values of the equivalent transversely isotropic medium as a function of the frequency. The numerical results show that, when the bulk modulus of the fracture-filling fluid is relatively large, the dispersion and attenuation of P-waves are mainly caused by fractures, and the values decrease as angles increase, almost vanishing when the incidence angle is 90 degrees (propagation parallel to the fracture plane). While the bulk modulus of fluid in fractures is much smaller than that of matrix pores, the attenuation due to the partial saturation mechanism makes the fluid flow from pores into fractures, which is almost independent of the incidence angle.
WOS关键词	P-WAVE ATTENUATION ; ALIGNED FRACTURES ; VISCOELASTIC MEDIA ; SATURATED ROCKS ; SEISMIC ATTENUATION ; ELASTIC-ANISOTROPY ; FLUID-FLOW ; DISPERSION ; VELOCITY ; PROPAGATION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	WILEY
WOS记录号	WOS:000413335700015
资助机构	National Basic Research Program of China (973 Program)(2015CB258500) ; major national science and technology program(2016ZX05004003-002) ; Curtin Reservoir Geophysics Consortium ; National Basic Research Program of China (973 Program)(2015CB258500) ; major national science and technology program(2016ZX05004003-002) ; Curtin Reservoir Geophysics Consortium ; National Basic Research Program of China (973 Program)(2015CB258500) ; major national science and technology program(2016ZX05004003-002) ; Curtin Reservoir Geophysics Consortium ; National Basic Research Program of China (973 Program)(2015CB258500) ; major national science and technology program(2016ZX05004003-002) ; Curtin Reservoir Geophysics Consortium
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/61994]
专题	地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者	Kong, Liyun
作者单位	1.PetroChina, Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 2.Curtin Univ, Perth, WA 6845, Australia 3.CSIRO, Perth, WA 6151, Australia 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Kong, Liyun,Gurevich, Boris,Zhang, Yan,et al. Effect of fracture fill on frequency-dependent anisotropy of fractured porous rocks[J]. GEOPHYSICAL PROSPECTING,2017,65(6):1649-1661.
APA	Kong, Liyun,Gurevich, Boris,Zhang, Yan,&Wang, Yibo.(2017).Effect of fracture fill on frequency-dependent anisotropy of fractured porous rocks.GEOPHYSICAL PROSPECTING,65(6),1649-1661.
MLA	Kong, Liyun,et al."Effect of fracture fill on frequency-dependent anisotropy of fractured porous rocks".GEOPHYSICAL PROSPECTING 65.6(2017):1649-1661.