Using airborne EM and borehole NMR data to map the transmissivity of a shallow semi-confined aquifer, western NSW

Kok Piang Tan; Ross S. Brodie; Larysa Halas; Ken Lawrie

doi:10.1071/ASEG2015ab173

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

ISSN: 2202-0586
E-ISSN:

oa Using airborne EM and borehole NMR data to map the transmissivity of a shallow semi-confined aquifer, western NSW
Authors Kok Piang Tan^a, Ross S. Brodie^b, Larysa Halas^c and Ken Lawrie^d
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^a Geoscience Australia, GPO Box 378, ACT, 2601, [email protected] ^b Geoscience Australia, GPO Box 378, ACT, 2601, [email protected] ^c Geoscience Australia, GPO Box 378, ACT, 2601, [email protected] ^d Geoscience Australia, GPO Box 378, ACT, 2601, [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/ASEG2015ab173
- Published online: 01 Dec 2015

Abstract

The Broken Hill Managed Aquifer Recharge (BHMAR) project aimed to define key groundwater resources and aquifer storage options in the lower Darling River floodplain of western NSW. The project was multi-disciplinary and utilised airborne electromagnetics (AEM), borehole nuclear magnetic resonance (NMR) and LiDAR DEM data and lithological, hydrostratigraphic and hydrochemical information to develop a suite of hydrogeological and groundwater property maps and products.

This abstract discusses the methods and results of estimating the transmissivity of the semi-confined target aquifer. Hydrostratigraphy and hydraulic texture classes were mapped by interpreting the AEM data in conjunction with borehole geophysics and lithological information. Aquifer transmissivity was statistically derived by combining borehole NMR hydraulic conductivity estimates with the mapped 3D distribution of texture classes and hydrostratigraphic units. Using a statistical and GIS approach, the derived aquifer thicknesses in the key areas ranged from 20 - 40 m and the lower and upper transmissivity bounds ranged from 1 to 10 m²/d, and 10 m²/d to 1000 m²/d, respectively.

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References

Abraham, J.D., Cannia, J.C, Bedrosian, P.A., Johnson, M.R., Ball, L.B. & Sibray, S.S. 2011. Airborne electromagnetic mapping of the base of the aquifer in areas of Western Nebraska. U.S. Geological Survey Scientific Investigations
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Christensen, N.B. 2012. Wave Number Domain Approximate Inversion procedure. Aarhus University Report to Geoscience Australia. (Unpublished).
Krasny, J. 1993. Classification of transmissivity magnitude and variation. Ground Water 31(2): 230-236.
Lawrie, K.C., Brodie R.S., Tan, K.P., Gibson, D., Magee, J.W., Clarke, J.D.A., Halas, L., Gow, L, Somerville, P., Apps, H.E., Christensen, N.B., Brodie, R.C., Abraham, J., Smith, M,
Page, D., Dillon, P., Vanderzalm, J., Miotlinski, K., Hostetler, S., Davis, A., Ley-Cooper, A.Y., Schoning, G., Barry, K. & Levett, K. 2012b. BHMAR Project: Data acquisition, processing, analysis and interpretation methods. Geoscience Australia Record 2012/11. Geocat 73819.
Lawrie, K.C., Brodie R.S., Dillon, P., Tan, K.P., Gibson, D., Magee, J.W., Clarke, J.D.A., Somerville, P., Gow, L., Halas, L., Apps, H.E., Page, D., Vanderzalm, J., Abraham, J., Hostetler, S., Christensen, N.B., Miotlinski, K., Brodie, R.C., Smith, M., Schoning, G., Barry, K. & Levett, K. 2012a.
BHMAR Project: Securing Broken Hill’s water supply: Assessment of conjunctive water supply options involving managed aquifer recharge and/or groundwater extraction at Menindee Lakes- Summary Report. Geoscience Australia Record 2012/16. Geocat 73823.
Munday, T., Fitzpatrick, A., Cahill, K., Hatch, M., Berens, V. & Overton, I. 2007. Spatio-temporal monitoring of floodplain environments using electromagnetic methods. 20th SAGEEP. Denver, Colorado, Proceedings Volume.

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Article Type: Research Article

Keyword(s): AEM; Managed aquifer recharge; NMR

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oa Using airborne EM and borehole NMR data to map the transmissivity of a shallow semi-confined aquifer, western NSW

Abstract

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