The Northern Territory SEEBASE® and GIS, 2021

 

The  Northern Territory SEEBASE® and GIS provides an upgraded, high-resolution 3D view of depth-to-basement that defines the geographic extent of subsurface basins systems. The results of the integrated basement and basin study are documented in this report, with all data sets and interpretative layers provided in a separate ArcGIS project.

This report presents datasets and interpretative results generated from the Northern Territory-wide project, including:

  • SEEBASE® depth-to-basement grid and image with interpretation confidence and comments

  • Basement terranes with updated boundaries and tectonic definition

  • Processed and enhanced potential field datasets

  • Regional insights into gravity and magnetic signatures (report only)

  • Major structural boundaries

  • Basement composition which incorporates recent results from the NTGS and Geoscience Australia

  • Tectonic events

  • Insights into basin systems including basement controls, key events, basin geometry and sediment thickness (report only)

  • Crustal-scale gravity models across the southern NT. Gravity models in the northern NT can be found in the 2018 greater McArthur SEEBASE® Study (Frogtech Geoscience, 2018a).

  • Magnetic depth modelling to support the depth-to-basement analysis

  • Basement-derived heat flow analysis

  • Total sediment thickness

  • Depth-to-Moho

  • Basement thickness

NT SEEBASE cover image.png
3D_NT_SEEBASE_Sth.png

The  Northern Territory SEEBASE® and GIS had three main work streams:

  • Update the 2018 NTGS-funded greater McArthur SEEBASE® Study with new datasets acquired through the NTGS’s Resourcing the Territory initiative and Geoscience Australia’s Exploring for the Future Program;

  • Incorporate and update the existing SEEBASE® of the Amadeus Basin that was undertaken for Santos Limited in 2015; and

  • Produce a new SEEBASE® that covers the remaining areas of the Northern Territory which include the Warburton/Pedirka, Ngalia, Wiso, Georgina and onshore Bonaparte basins, along with intervening areas of shallow basement.

The  Northern Territory SEEBASE® and GIS was funded through the Northern Territory’s Resourcing the Territory initiative and is provided to explorers as a pre-competitive dataset.

The NTGS is gratefully acknowledged for their technical contributions to the study and their review of this report. The NTGS and Geognostics also acknowledge the contributions from past work by Santos Limited (Amadeus Basin SEEBASE® Study) and Pangaea Resources Pty Ltd (McArthur Basin SEEBASE® Study). Proprietorial seismic data was also made available for the study by Empire Energy and Sweetpea Petroleum.

The complete Northern Territory SEEBASE and GIS Report can be viewed online below or downloaded in full from the Northern Territory Geological Survey