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An Integrated Model of Shear Wave Anisotropy in the Vicinity of a Hydraulic Fracture
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- Author / Creator
- Brisco, Colin D
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This thesis explores the effect of fluid substitution, pore-pressure diffusion and stresses due to hydraulic fracturing on the elastic velocities and microcrack orientations in the surrounding rock. I develop a workflow incorporating three main components to model the velocity field around the fracture. Fracture induced confining-stresses are analytically modelled using Eshelby's inclusion method, pore-pressure diffusion is numerically modelled and the resulting anisotropic velocity is found by modelling preferential opening/closing of a microcrack distribution using the Anisotropic Poroelasticity model. I investigate two categories of subsurface scenario: an isotropic reservoir experiencing an uniaxial confining-stress perturbation and an anisotropic reservoir experiencing pore-pressure diffusion and a triaxial confining-stress perturbation. I find that the simplified uniaxial-stress implementation is inadequate in approximating the triaxial stress with pore-pressure diffusion implementation, and the region around a hydraulic fracture can be divided into four spatiotemporal zones of differing modelled characteristics: the proximal, compressive, shear and tensile zones.
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- Subjects / Keywords
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- Graduation date
- Spring 2018
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.