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Permanent link (DOI): https://doi.org/10.7939/R3FN11007

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Magnetotelluric Imaging of Electrically Anisotropic Crust Near Fort McMurray, Alberta: Implications for Engineered Geothermal Systems Open Access

Descriptions

Other title
Subject/Keyword
Anisotropy
Forward Modeling
Magnetotellurics
Engineered Geothermal Systems
Electromagnetics
Geophysics
Geothermal
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Liddell, Mitchell V.
Supervisor and department
Unsworth, Martyn (Physics, Earth and Atmospheric Sciences)
Examining committee member and department
Potter, David (Physics, Earth and Atmospheric Sciences)
Schmitt, Doug (Physics)
Chacko, Thomas (Earth and Atmospheric Sciences)
Department
Department of Physics
Specialization
Geophysics
Date accepted
2014-07-15T10:07:51Z
Graduation date
2014-11
Degree
Master of Science
Degree level
Master's
Abstract
The goal of this thesis is to investigate the character of the basement rocks beneath the oilsands region around Fort McMurray in the context of developing engineered geothermal systems (EGS). Magnetotelluric (MT) data were collected at 94 stations on two profiles near to Fort McMurray and initial inversions showed that while these data exhibited strong 2-D character, an isotropic analysis of the MT data was not possible. Forward modeling of 2-D anisotropy showed that the basement below a depth of 4 - 5 km is electrically anisotropic with a resistivity ratio close to 1000. It was also shown that certain features of MT data commonly interpreted with a 3-D model could be explained with 2-D anisotropic model. The source of the anisotropy was interpreted to be due to interconnected graphite films oriented ~S27E within the metamorphic basement rocks. This direction is reasonably close to the current minimum stress direction of ~S40E, the interaction between the rock MT-interpreted rock fabric and the stress direction will control the propagation of artificial fractures.
Language
English
DOI
doi:10.7939/R3FN11007
Rights
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.
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