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Moving between dimensions in electromagnetic inversions

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doi: 10.1190/segam2015-5930379.1
Authors:Kang, Seogi; Cockett, Rowan; Heagy, Lindsey J.; Oldenburg, Douglas W.
Author Affiliations:Primary:
University of British Columbia, Geophysical Inversion Facility, Vancouver, BC, Canada
Volume Title:Society of Exploration Geophysicists international exposition and Eighty-fifth annual meeting; technical program expanded abstracts
Source:SEG Technical Program Expanded Abstracts, Vol.34, p.5000-5004; Society of Exploration Geophysicists international exposition and Eighty-fifth annual meeting, New Orleans, LA, Oct. 18-23, 2015, edited by Anonymous. Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States. ISSN: 1949-4645
Publication Date:2015
Note:In English
Summary:Electromagnetic (EM) methods are used to characterize the electrical conductivity distribution of the Earth. EM geophysical surveys are increasingly being simulated and inverted in 3D, due in part to computational advances. However, the availability of computational resources does not invalidate the use of lower dimensional formulations and methods, which can be useful depending on the geological complexity as well as the survey geometry. Due to their computational speed, simulations in 1D or 2D can also be used to quickly gain geologic insight. For example, this insight can be used in an EM inversion starting with a 1D inversion, then building higher dimensionality into the model progressively. As such, we require a set of tools that allow a geophysicists to easily explore various model dimensionalities, such as 1D, 2D, and 3D, in the EM inversion. In this study, we suggest a mapping methodology that transforms the inversion model to a physical property for use in the forward simulations. Using this general methodology, we apply an EM inversion to a suite of models in one, two, and three dimensions, and suggest the importance of choosing an appropriate model space based on the goal of the EM inversion.
Subjects:Cartography; Electrical conductivity; Electromagnetic methods; Exploration; Geophysical methods; Ground water; Three-dimensional models; Time domain analysis; Water resources
Record ID:809329-69
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
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