Authors / CoAuthors
Clarke, J.D.A. | Tan, K.P. | Lawrie, K. | Mauger, A.
Abstract
This study of drillcore materials was carried out to assess the ability of hyperspectral methods to rapidly map the distribution of key minerals pertinent to managed aquifer recharge studies in the Darling floodplain. The study used two hyperspectral instruments: the Hylogger core scanner (using an instrument at DMITRE Minerals in Adelaide); and the Portable Infrared Mineral Analyser (PIMA). Further validation of the methods was carried out using XRD analysis of selected samples. Cores were obtained using the sonic drilling method. The Hylogger tool qualitatively mapped the distribution of clays and oxides in both the confining aquitard and key aquifers. The unconfined Coonambidgal Formation aquifer is dominated by montmorillonite, and the Blanchetown Clay aquitard by kaolinite with lesser montmorillonite. Clay mineralogy in the Calivil Formation aquifer is related to sedimentary facies, with kaolinite and lesser nontronite in muddy units, and kaolinite-dominant or smectite-dominant clays in sandy units. The two clay mineral associations were found to correlate with different hydraulic conductivity trends in the NMR data from the aquifer. These trends have been defined by the Kernel Function of Nuclear Magnetic Resonance (NMR)-derived hydraulic conductivity data. Kernel Functions (C values) of 6,200 corresponding with predominantly smectites in the screened aquifer interval, and C values of 46,000 corresponding with kaolinite in the screened aquifer intervals of two holes. This made it possible to predict the dominant clay in the screened aquifer intervals in the remaining NMR-logged holes. These predictions were tested using PIMA analysis of the clay mineralogy of addition from NMR-logged holes. Of 97 PIMA scans, 67 contained the predicted mineralogy and 27 did not, giving a success rate of 69%, providing reasonable confidence that the Kernal Function in the NRM logging can be explained by the clay mineralogy. Overall, this study demonstrates that hyperspectral logging can provide relatively rapid, semi-quantitative data on the abundance and distribution of clay and oxide mineralogy in drillcore. These data assisted with geochemical modelling and risk assessments at the Jimargil aquifer storage and recovery (ASR) site.
Product Type
nonGeographicDataset
eCat Id
75730
Contact for the resource
Custodian
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
-
- External PublicationAbstract
- Australian and New Zealand Standard Research Classification (ANZSRC)
-
- Geology
-
- Published_Internal
Publication Date
2013-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Special, MOU, etc.
Access - restricted
Use - license
Status
Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
Abstract prepared for submission to the International Association of Hydrogeologists (IAH).
Parent Information
Extents
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
Source data not available.