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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
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

Record

Issue identification

2021-004

Status
Completed
Point of contact
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

N
S
E
W


Maintenance and update frequency
As needed

Resource format

Title

Product data repository: Various Formats

Website

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
  • EARTH SCIENCES

Project
  • EFTF

Project
  • Exploring For The Future

Stratum
  • Oolloo

Stratum
  • Jinduckin

Instrument
  • AEM

Place
  • Daly River

Keywords
  • Published_External

Resource constraints

Title

Creative Commons Attribution 4.0 International Licence

Alternate title

CC-BY

Edition

4.0

Website

http://creativecommons.org/licenses/

Access constraints
License
Use constraints
License

Resource constraints

Title

Australian Government Security ClassificationSystem

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified
Language
English
Character encoding
UTF8

Distribution Information

Distributor contact
Role Organisation / Individual Name Details
Distributor

Commonwealth of Australia (Geoscience Australia)

Voice
OnLine resource

Download the Record (pdf) [4.2 MB]

Download the Record (pdf) [4.2 MB]

Distribution format
  • pdf

Metadata constraints

Title

Australian Government Security Classification System

Edition date
2018-11-01T00:00:00
Website

https://www.protectivesecurity.gov.au/Pages/default.aspx

Classification
Unclassified

Metadata

Metadata identifier
urn:uuid/81b9773c-e19a-432b-b583-8d85a6ee7f8d

Title

GeoNetwork UUID

Language
English
Character encoding
UTF8
Contact
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

GA publication:

Alternative metadata reference

Title

Geoscience Australia - short identifier for metadata record with

uuid

Citation identifier
eCatId/134038

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/5167d912-6784-4371-9938-3931e84ca6f1

Metadata linkage

https://ecat.ga.gov.au/geonetwork/srv/eng/catalog.search#/metadata/81b9773c-e19a-432b-b583-8d85a6ee7f8d

Metadata linkage

https://ecat.ga.gov.au:80/geonetwork/srv/eng/catalog.search#/metadata/81b9773c-e19a-432b-b583-8d85a6ee7f8d

Date info (Creation)
2019-04-08T01:55:29
Date info (Revision)
2019-04-08T01:55:29

Metadata standard

Title

AU/NZS ISO 19115-1:2014

Metadata standard

Title

ISO 19115-1:2014

Metadata standard

Title

ISO 19115-3

Title

Geoscience Australia Community Metadata Profile of ISO 19115-1:2014

Edition

Version 2.0, September 2018

Citation identifier
https://pid.geoscience.gov.au/dataset/ga/122551

 
 

Spatial extent

N
S
E
W


Keywords

AEM EFTF Exploring For The Future Jinduckin Oolloo
theme.ANZRC Fields of Research.rdf
EARTH SCIENCES

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