Authors / CoAuthors
Clarke, J.D.A. | Mauger, A. | Tan, K.P. | Lawrie, K.C.
Abstract
In this study, two hyperspectral instruments were used on sonic-cored drillhole materials to assess the value of hyperspectral methods for hydrogeological investigations: (1) the Hylogger core scanner; and (2) the Portable Infrared Mineral Analyser (PIMA). The hylogger provides continuous coverage down the logged sonic cores in the visible to near-infrared (VNIR), short wavelength infrared (SWIR), and thermal infrared (TIR) bands. The PIMA is used on individual samples, and was used to cross-check SWIR results from the Hylogger. Further validation of the methods was carried out using XRD analysis of selected samples. The hylogging method successfully mapped the distribution of clays and oxides in both the aquitards and aquifers. The Coonambidgal Formation shallow aquifer is dominated by montmorillonite, and the Menindee Formation and Blanchetown Clay aquitard by kaolinite with lesser montmorillonite. Clay mineralogy in the Calivil Formation was strongly controlled by sedimentary facies, with muddy units predominantly kaolinite, with lesser nontronite, and clays in sandy units either kaolinite-dominant or smectite-dominant. The two clay mineral associations were also found to correlate with different hydraulic conductivity trends in the Nuclear Magnetic Resonance logging of the aquifer. The underlying Renmark Group contained mixed kaolinite and smectite. Mapping of oxide species (and Munsell colours) was also informative in terms of mapping overprinting redox zones, with goethite found to be ubiquitous in all formations. Haematite was however, detected only locally in the Calivil Formation and Renmark Group. Overall, we conclude that hyperspectral logging of drillcore is a powerful tool for use in detailed hydrogeological investigations.
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nonGeographicDataset
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73631
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- GA PublicationAbstract
- ( Theme )
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- hydrogeology
- ( Theme )
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- groundwater
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2012-01-01T00:00:00
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[-33.159278, -31.814781, 141.958071, 143.284724]
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