Authors / CoAuthors
Ray, A. | Symington, N. | Ley-Cooper, Y. | Brodie, R.C.
Abstract
<p>Airborne electromagnetic (AEM) data can be acquired cost-effectively, safely and efficiently over large swathes of land. Inversion of these data for subsurface electrical conductivity provides a regional geological framework for water resources management and minerals exploration down to depths of ~200 m, depending on the geology. However, for legacy reasons, it is not uncommon for multiple deterministic inversion models to exist, with differing details in the subsurface conductivity structure. This multiplicity presents a non-trivial problem for interpreters who wish to make geological sense of these models. In this article, we outline a Bayesian approach, in which various spatial locations were inverted in a probabilistic manner. The resulting probability of conductivity with depth was examined in conjunction with multiple existing deterministic inversion results. The deterministic inversion result that most closely followed the high-credibility regions of the Bayesian posterior probability was then selected for interpretation. Examining credibility with depth also allowed interpreters to examine the ability of the AEM data to resolve the subsurface conductivity structure and base geological interpretation on this knowledge of uncertainty. <p> <b>Citation:</b> Ray, A., Symington, N., Ley-Cooper, Y. and Brodie, R.C., 2020. A quantitative Bayesian approach for selecting a deterministic inversion model. In: Czarnota, K., Roach, I., Abbott, S., Haynes, M., Kositcin, N., Ray, A. and Slatter, E. (eds.) Exploring for the Future: Extended Abstracts, Geoscience Australia, Canberra, 1–4.
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document
eCat Id
133626
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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- theme.ANZRC Fields of Research.rdf
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- MATHEMATICAL SCIENCESEARTH SCIENCES
- ( Project )
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- Exploring for the Future
- ( Project )
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- EFTF
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- method development
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- toolbox
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- Bayesian inference
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- airborne electromagnetics
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- geophysical inversion
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- noise models
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- transdimensional
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- Published_External
Publication Date
2020-05-08T02:16:26
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geoscientificInformation
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Using the tools of Bayesian inference and parsimony, this article outlines a methodology with which to select the optimal existing model for interpreting conductivity sections inverted from airborne electromagnetic data.
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[-44, -9, 112, 154]
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