Authors / CoAuthors
Abraham, J.D. | Tan, K.P. | Lawrie, K. | Brodie, R.S. | Clarke, J. | Halas, L.
Abstract
There is increasing demand from policy makers for high levels of certainty before committing to decisions on water security infrastructure. This demand for higher certainty in groundwater model predictions has provided an impetus for new hydrogeological research directions. This has included a renewed impetus in the search for technologies and methods to aid rapid groundwater resource assessment. Critical measurements used to parameterise groundwater models include effective porosity and hydraulic conductivity measurements. Typically, values for effective porosity are derived by lithological comparisons with published data, and measurements of hydraulic conductivity acquired by limited constant head pumping tests or slug tests. Look-up tables are used for deriving effective porosity as a surrogate for expensive and time consuming laboratory measurements of cores that may be biased by sampling, and the difficulty of making measurements on unconsolidated materials. However, pump tests are costly and time-consuming, with environmental permissions for disposal of produced waters increasingly difficult to obtain. Nuclear Magnetic Resonance (NMR) can provide a direct measurement of the presence of water in the pore space of aquifer materials. The detection is possible due to the nuclear magnetization of the hydrogen (protons) in the water. The NMR measurement is the basis of MRI (magnetic resonance imaging) in medical applications, and geophysical logging applications within consolidated sediments for the petroleum industry. In the Darling River floodplain, NMR data were acquired in 26 boreholes in a 4-week period. Effective porosity values were derived directly from the NMR data, and hydraulic conductivity values were calculated using empirical relationships calibrated and verified with limited laboratory permeameter and field aquifer tests.
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nonGeographicDataset
eCat Id
73795
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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- External PublicationAbstract
- ( Theme )
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- AEM
- ( 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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2012-03-15T00:00:00
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