Modeling seismic wave propagation during fluid injection in a fractured network: Effects of pore fluid pressure on time-lapse seismic signatures

Liu, Enru; Vlastos, S.; Li, Xiangyang; Main, Ian; Schoenberg, Michael

doi:10.1190/1.1786902

Cited by 8 publications

(5 citation statements)

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“…However, measurements of seismic attenuation, seismic anisotropy, and wave speeds can be used as a noninvasive probe to monitor changes in the subsurface (e.g., Liu et al, 2004). The frequency dependence of attenuation and wave speeds also depends on hydrogeologic properties such permeability and the nature of permeability heterogeneity.…”

Section: Poroelastic Deformation and Fluid Flowmentioning

confidence: 99%

Earthquake Hydrology

Manga

Wang

2015

Treatise on Geophysics

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Section: Poroelastic Deformation and Fluid Flowmentioning

confidence: 99%

Earthquake Hydrology

Manga

Wang

2015

Treatise on Geophysics

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“…[6] Moreover there have been many attempts to correlate the elastic (mechanical) and hydraulic (transport) properties of fractured rock [Cook, 1992;Bayuk and Chesnokov, 1998;Pyrak-Nolte, 2002;King, 2002;Liu et al, 2004]. These correlations are not always straightforward, and can sometimes be enigmatic, with the result that the inversion of seismic data for hydraulic transport properties is complex and must be done with care [Rasolofosaon and Zinszner, 2002].…”

Section: Introductionmentioning

confidence: 99%

Influence of shear and deviatoric stress on the evolution of permeability in fractured rock

et al. 2009

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[1] The evolution of permeability in fractured rock as a function of effective normal stress, shear displacement, and damage remains a complex issue. In this contribution, we report on experiments in which rock surfaces were subject to direct shear under controlled pore pressure and true triaxial stress conditions while permeability was monitored continuously via flow parallel to the shear direction. Shear tests were performed in a pressure vessel under drained conditions on samples of novaculite (Arkansas) and diorite (Coso geothermal field, California). The sample pairs were sheared to 18 mm of total displacement at 5 mm/s at room temperature and at effective normal stresses on the shear plane ranging from 5 to 20 MPa. Permeability evolution was measured throughout shearing via flow of distilled water from an upstream reservoir discharging downstream of the sample at atmospheric pressure. For diorite and novaculite, initial (preshear) fracture permeability is 0.5-1 Â 10 À14 m 2 and largely independent of the applied effective normal stresses. These permeabilities correspond to equivalent hydraulic apertures of 15-20 mm. Because of the progressive formation of gouge during shear, the postshear permeability of the diorite fracture drops to a final steady value of 0.5 Â 10 À17 m 2 . The behavior is similar in novaculite but the final permeability of 0.5 Â 10 À16 m 2 is obtained only at an effective normal stress of 20 MPa.

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“…After set up, fractures are generated, constrained to the seismic data in a leastsquares sense. These seismic fracture attributes can then be used as the primary input for advanced fracture modelling tools and for fluid flow simulation Vlastos et al 2003;Liu et al 2004). Whilst the determination of meaningful fracture attributes from seismic data is not a trivial process and the route is still, as yet, uncertain, the seismic-fracture model methodology has provided a way of addressing the interwell uncertainty present in most fractured reservoir models.…”

Section: From Seismic Data To Reservoir Simulation: Discrete Fracturementioning

confidence: 99%

Quantitative determination of hydraulic properties of fractured rock using seismic techniques

Liu

Chapman

Hudson

et al. 2005

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There have been significant advances over the last ten years in the use of the seismic anisotropy concept to characterize subsurface fracture systems. Measurements of seismic anisotropy are now used to deduce quantitative information about the fracture orientation and the spatial distribution of fracture intensity. Analysis of the data is based upon various equivalent medium theories that describe the elastic response of a rock containing cracks or fractures in the long wavelength limit. Conventional models assume scale/ frequency independence and hence cannot distinguish between micro-cracks and macrofractures. The latter, however, control the fluid flow in many oil/gas reservoirs, as the fracture size and spacing (hence fracture storability) are essential parameters for reservoir engineers. Recently, a new equivalent medium theory for modelling of wave propagation in media with multi-scale fractures has been presented. The model predicts velocity dispersion and attenuation due to a squirt-flow mechanism at two different scales: the grain scale (micro-cracks and equant matrix porosity) and formation-scale fractures. Application of this model to field data shows that fracture density and fracture size can be inverted successfully from the frequency dependence of the time delay between split shear waves. The derived fracture length matches independent observations from borehole data. This paper presents the results of the latest development in the seismic characterization of natural fractures, with an emphasis on the quantitative determination of fracture sizes.

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Modeling seismic wave propagation during fluid injection in a fractured network: Effects of pore fluid pressure on time-lapse seismic signatures

Cited by 8 publications

References 0 publications

Earthquake Hydrology

Earthquake Hydrology

Influence of shear and deviatoric stress on the evolution of permeability in fractured rock

Quantitative determination of hydraulic properties of fractured rock using seismic techniques

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