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Curnamona Province

PIRSA's early 3D modelling trials targeted the Curnamona Province Region. The process of building the Curnamona model in 3D GeoModeller (external site, opens in new window) began with identifying the statigraphic units that were to be modelled. Due to the regional scale of the project, the stratigraphic pile represents packages of units aggregated into single units.

The input data were prepared utilising appropriate subsets of PIRSA's geoscientific database and spatial data library. These data sources included elevation, solid geology, surface geology, faults, field observations, sectional interpretations based on geological interpretation of unconstrained geophysical inversions.

2D points were used to define contact between units as parameters for interpolation into 3D objects. In addition to the topographic section (top-down view), the modeller created cross-section views of the input data and added further observation and contact points. Stratigraphic pile and contact relationship between units (erosive or onlapping) are further parameters used by 3D GeoModeller for model interpolation.

After the input data points were added to the 3D GeoModeller sections, the 3D model was computed.

Geomodeller uses kriging interpolators to compute a three dimensional model, utilising the rules of stratigraphic pile as well as conformable and erosional contact of units as defined by modeller.

Forward modelling and inversion were not utilised on the Curnamona model, therefore the 3D model has not been tested against potential field data (gravity and magnetic intentsity).

The completed model displays 3D objects representing the major stratigraphic units within the Curnamona Province. The model was exported to file formats suitable for viewing in Discover 3D, Gocad or Adobe Reader.

Curnamona - Click to enlarge

 

      

 

 

 

Using the model

In order to increase its accessibility, the Curnamona Province Model has been converted to .pdf format, allowing for maximum portability and eliminating the need for the end user to purchase any specialised software.
 
The user can fully interact with the model using Adobe Acrobat’s 3D Toolbar (Note: the toolbar varies with the version of Acrobat Reader):

  1. Rotate
  2. Spin
  3. Pan
  4. Zoom
  5. Default view
  6. Select view
  7. Toggle model tree
  8. Pause animation
  9. Use orthographic projection
  10. Model render mode
  11. Enable extra lighting
  12. Background colour (disabled if a gradient background is being used)

Adobe Acrobat 3D toolbar

The user can also:

  • Selectively activate and/or deactivate any geological unit, cross section or isopach 
  • Enable geological surfaces to be displayed as transparent, solid or as a solid-wireframe

Software Information
The models can be viewed with Acrobat Reader 9 as it incorporates 3D visualisation capabilities. Acrobat Reader 9 can be downloaded free from the Adobe website.

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Download the Curnamona Basement 3D model

       Curnamona basement geology.jpg

Download the Curnamona Province 3D model (.pdf 8.4 Mb, opens in new window)

Note: this model is presented as a 'proof of concept' only and the accuracy (spatial or otherwise) should not be relied upon for exploration or other decision making processes.

South Australian 3D models: Gawler Craton And Curnamona Province DVD

 

Gawler province 3D geomodel DVD cover

Includes:

  • GIS data sets used in construction of the model
  • tsurf and dxf 3D files
  • MapInfo Discover 3D v2.a session files (*.egs)
  • geophysical interpreted cross sections.

South Australian 3D models: Gawler Craton And Curnamona Province DVD is available for $20 plus postage and handling from PIRSA Customer Service Centre, email PIRSA.CustomerServices@sa.gov.au,  phone +61 8 8463 3000.

 

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