Product catalogue
Exploring for the Future—Remodelling the Oolloo–Jinduckin interface across the Daly Basin, Northern Territory: Interpreting stratigraphic boundaries using probabilistic airborne electromagnetic inversions
This report presents key results from the Daly River groundwater project conducted as part of Exploring for the Future (EFTF), an Australian Government funded geoscience data and information acquisition program. The four-year (2016-20) program focused on better understanding the potential mineral, energy and groundwater resources in northern Australia.
In this investigation we use models of sub-surface bulk electrical conductivity within the geological Daly Basin to model the depth of the interface between the Jinduckin Formation and the overlying Oolloo Dolostone. The Olloo dolostone is the most extracted aquifer in the Daly basin, while the Jinduckin Formation is an aquitard separating the Olloo from the lower Tindall Limestone aquifer. Airborne electromagnetic (AEM) data acquired across the basin were inverted with both deterministic and stochastic methods to generate a suite of bulk electrical conductivity models. Comparison with boreholes suggested that the Jinduckin Formation is significantly more conductive than the Oolloo Dolostone and this interface is well resolved in these AEM conductivity models. We developed an interactive plot for visualising the probability distribution of bulk conductivities for AEM points inverted with the stochastic inversion routine. We interpreted 389 AEM points using this approach and used interpolation to derive a new stratigraphic Olloo—Jinduckin surface. The new surface is generally deeper than current models of the interface, which were derived by interpolating stratigraphic picks from boreholes. In the data-sparse south-west of the Daly Basin the new geological surface is up to 390 m deeper than what is currently mapped. This new interface can be used to better constrain aquifer architecture in groundwater flow modelling and support groundwater management of this region. The method developed for interpreting stratigraphy directly from the posterior probability distribution of electrical conductivity is applicable for other geophysical interpretation tasks.
Simple
Identification info
- Date (Creation)
- 2021-02-01
- Date (Publication)
- 2021-02-03
- Date (Revision)
- 2021-02-03T03:53:27
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/134038
- Citation identifier
- Digital Object Identifier/http://dx.doi.org/10.11636/Record.2021.004
- Cited responsible party
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Role Organisation / Individual Name Details Author Symington, N.J.
External Contact Author Haiblen, A.M.
External Contact Author Ray, A.
MEG Internal Contact Author Tickell, S.J.
External Contact Author Gow, L.J.
External Contact
- Name
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Record
- Issue identification
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2021-004
- Status
- Completed
- Point of contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Hostetler, S.
MEG Internal Contact
- Spatial representation type
- Topic category
-
- Geoscientific information
Extent
Extent
))
- Maintenance and update frequency
- As needed
Resource format
- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- theme.ANZRC Fields of Research.rdf
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EARTH SCIENCES
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- Project
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EFTF
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- Project
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Exploring For The Future
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- Stratum
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Oolloo
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- Stratum
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Jinduckin
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- Instrument
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AEM
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- Place
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Daly River
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
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4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Download the Record (pdf) [4.2 MB]
Download the Record (pdf) [4.2 MB]
- Distribution format
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pdf
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Metadata constraints
- Title
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Australian Government Security Classification System
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
-
urn:uuid/81b9773c-e19a-432b-b583-8d85a6ee7f8d
- Title
-
GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice Point of contact Hostetler, S.
MEG Internal Contact
Type of resource
- Resource scope
- Document
- Name
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GA publication:
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/134038
- Date info (Creation)
- 2019-04-08T01:55:29
- Date info (Revision)
- 2019-04-08T01:55:29
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551