Constrained inversion of helicopter AEM data for mapping the Blanchetown Clay

Ross Brodie; Andy Green; Tim Munday

doi:10.1071/ASEG2004ab013

ISSN: 2202-0586
E-ISSN:

oa Constrained inversion of helicopter AEM data for mapping the Blanchetown Clay
Authors Ross Brodie^a, Andy Green^b and Tim Munday^c
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^a Geoscience Australia, Australia, [email protected] ^b OTBC Pty. Ltd, Australia, [email protected] ^c CRCLEME/CSIRO Exploration and Mining, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2004, Issue ASEG2004 - 17th Geophysical Conference, Dec 2004, p. 1 - 5
DOI: https://doi.org/10.1071/ASEG2004ab013
- Published online: 01 Dec 2004

Abstract

A RESOLVE frequency domain helicopter electromagnetic (HEM) survey has been flown in and around the Riverland irrigation districts of South Australia. The purpose was to map the distribution and thickness of near-surface clay-rich sediments which impact on irrigation, groundwater and salinity management strategies.

The survey data were re-calibrated after their conventional processing by utilising independent ground geoelectric data.

Data were inverted using a five-layer 1-D parameterisation of the Earth. Reduction of the ambiguity in the unknown aspects of the geological section was sought by constraining the inversion with as much local geological and hydrological information as was available. Groundwater depth information was incorporated as an extra datum to constrain the upper layer thicknesses. A combination of drillhole lithologic, groundwater and downhole conductivity data were used to construct a spatially variable reference model and impose constraints on the estimated parameters in the form of prior probability information.

The resulting detailed map of the thickness of the Blanchetown Clay is more detailed than previous compilations based on drilling. The results also provide insight into other important hydrogeological features of the Riverland area.

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References

Brodie, R.C., Green A.A, and Munday, T.J., 2003. Calibration of RESOLVE airborne electromagnetic data, Riverland and East Tintinara, South Australia: CRC-LEME Restricted Report 190R.
Cowey, D., Game, D., and Tovey, A., 2003, Riverland and Tintinara, South Australia, RESOLVE Geophysical Survey, acquisition and processing report: Report to the Bureau of Rural Sciences, available from Geoscience Australia.
Deszcz-Pan, M., Fitterman, D.V., and Labson, V.F., 1998, Reduction of inversion errors in helicopter EM data using auxiliary information: Exploration Geophysics, 29, 142-146.
Green, A., Brodie, R. and Munday, T., 2004, Interpretation of helicopter AEM data from the Riverland area, S.A.:Extended Abstracts ASEG 17 Geophysical Conference and Exhibition, Sydney 2004.
Green A.A., Brodie, R.C., and Munday, T.J., 2003. Constrained inversion of RESOLVE electromagnetic data, Riverland, South Australia: CRC-LEME Restricted Report 152R.
Green, A. and Lane, R. 2003, Estimating noise levels in AEM data: Extended Abstracts ASEG 16 Geophysical Conference and Exhibition, February 2003, Adelaide.
Guptasarma, D., and Singh, B., 1997, New digital linear filters for Hankel JO and Jl transforms: Geophysical Prospecting, 45, 745-762.
Menke, W., 1989, Geophysical data analysis: discrete inverse theory: Academic Press. Section 9.3, p. 147.
Tan, K.P., Munday, T.J., Fitzpatrick, A., Barnett, S., and Green, A., 2004, The validation of RESOLVE AEM data in the Riverland, South Australia: to determine their value in mapping a regionally significant, near-surface, hydrogeological unit: Extended Abstracts ASEG 17 Geophysical Conference and Exhibition, Sydney 2004.
Wait, J. R. 1982, Geo-electromagnetism: Academic Press, New York.

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Article Type: Research Article

Keyword(s): AEM; constrained inversion; groundwater; irrigation; Riverland; salinity

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