Source parameter inversion for wave energy focusing to a target inclusion embedded in a three‐dimensional heterogeneous halfspace

Karve, Pranav; Fathi, Arash; Poursartip, Babak; Kallivokas, Loukas F.

doi:10.1002/nag.2662

Cited by 3 publications

(1 citation statement)

References 43 publications

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“…Although our results suggest that dynamically changing permeability of fractured systems may be feasible, we acknowledge the engineering challenges that artificial stimulation of reservoirs represent. Karve et al () pointed out that the effectiveness of seismic stimulation for enhanced oil recovery using artificial sources, such as a fleet of surface vibrators or downhole hydraulic pumps, depends on the strength and spatial extent of the wave motion in the oil reservoir. They proposed an optimization‐based algorithm for designing an efficient wave energy delivery system to generate the wave motion of the required magnitude in the reservoir.…”

Section: Discussionmentioning

confidence: 99%

Fracture Unclogging: A Numerical Study of Seismically Induced Viscous Shear Stresses in Fluid‐Saturated Fractured Rocks

et al. 2019

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Dynamic shaking imposed by passing seismic waves is able to promote various hydrological processes in fractured reservoirs. This is often associated with seismically induced fracture unclogging due to mobilization of deposited colloids in the fracture network which, in turn, affects permeability at the reservoir scale. Numerous laboratory and field studies pointed out that fracture unclogging can be initiated when viscous shear stresses in the fracture fluid are in the range of 0.1-1 Pa. In this numerical study, we compute viscous shear stress in a fluid-saturated fractured medium due to the action of passing P and S waves. We perform a sensitivity analysis in terms of fluid, fracture, and host rock physical properties as well as seismic wave characteristics. Our results show that seismically induced viscous shearing increases with frequency and seismic strain and can be in the order of those initiating fracture unclogging for typical seismic strains and frequencies. S waves tend to produce viscous shearing approximately 2 times larger than P waves, and, for anisotropic distribution of fractures, it is extremely dependent on the direction of wave propagation. Moreover, larger viscous shearing is expected for more viscous fluids and stiffer host rocks. Regarding the fracture network distribution, for the same fracture density, the presence of longer fractures drastically increases the potential of fracture unclogging at seismic frequencies. The fracture aperture distribution, on the other hand, can also affect the development of viscous shearing. Fractures with correlated distributions of contact areas exhibit an order of magnitude larger viscous shearing than uncorrelated ones.

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Section: Discussionmentioning

confidence: 99%