Quantifying model structural uncertainty and facies prediction for locating groundwater supplies in Timor-Leste using AEM data

Burke J. Minsley; A. Yusen Ley-Cooper

doi:10.1071/ASEG2015ab126

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa Quantifying model structural uncertainty and facies prediction for locating groundwater supplies in Timor-Leste using AEM data
Authors Burke J. Minsley^a and A. Yusen Ley-Cooper^b
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^a U.S. Geological Survey, MS 964 - Denver Federal Center, Denver, , CO, , USA, [email protected] ^b CSIRO 26 Dick Perry Av., Kensington, , WA, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab126
- Published online: 01 Dec 2015

Abstract

Geological structures key to understanding groundwater resources in Timor-Leste’s Baucau Plateau are mapped using an airborne electromagnetic (AEM) survey. A comprehensive assessment of model structural uncertainty is conducted using a Bayesian Markov chain Monte Carlo algorithm, and an approach for translating geophysical to geological model uncertainty is introduced. A prominent feature of the Baucau survey is a very high-contrast transition from resistive limestone materials to conductive clays, which is well-resolved from the AEM analysis. The inferred 3D geometry of potentially water-bearing limestone units that overly relatively impermeable clays is a key outcome of this analysis, and will be the focus of future ground-truthing efforts.

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2015-12-01

2026-01-18

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References

Ley, Y., and Munday, T., (2012), Electromagnetic methods used for the characterisation of aquifers in Timor-Leste, in 22nd International Geophysical Conference and Exhibition, edited, p. 4 p, ASEG, Brisbane, Queensland, Australia.
Furness, L (2012), Baucau Karst Limestone Aquifer Airborne EM survey. Internal Report BESIK Water Resources Management and Climate Adaptation Advisor in Timor Leste.
Minsley, B.K., (2011), A trans-dimensional Bayesian Markov chain Monte Carlo algorithm for model assessment using frequency-domain electromagnetic data, Geophysical Journal International, 187, 252-272, doi: 10.1111/j. 1365-246X.2011.05165.X.
Sambridge, M., T. Bodin, K. Gallagher, and H. Tkalcic (2013), Transdimensional inference in the geosciences, Phil. Trans. R. Soc. A, 577(1984), doi:10.1098/rsta.2011.0547.
Siemon, B., A. V. Christiansen, and E. Auken (2009), A review of helicopter-borne electromagnetic methods for groundwater exploration, Near Surface Geophysics, 7(5-6), 629-646, doi: 10.3997/1873-0604.2009043.

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Article Type: Research Article

Keyword(s): AEM; East Timor; groundwater; uncertainty quantification

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oa Quantifying model structural uncertainty and facies prediction for locating groundwater supplies in Timor-Leste using AEM data

Abstract

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