The Gawler Province 3D Geological Model is the second product of PIRSA's early 3D modelling trials conducted using 3D GeoModeller software. The work began with identifying the statigraphic units that were to be modelled. Due to the regional scale of the project, the stratigraphic pile constructed for this model 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, and subsurface sectional interpretations based on geological interpretation of unconstrained geophysical inversions. 2D points were used to define the contact planes between units as parameters for interpolation into 3D objects. In addition to the topographic section (top-down view), the modeller created cross-sectional views of the input data, and added further observation and contact points. Stratigraphic pile and contact relationships between units (erosive or onlapping) are further parameters used by 3D GeoModeller for performing model interpolations. After these types of 2D 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 above-described rules of layer and unit geometric limits as defined by the modeller.

Forward modelling and inversion were not utilised on the Gawler Province model, therefore the 3D model has not been tested against geophysical potential field data (gravity and magnetic intensity). The completed model displays 3D objects representing the major stratigraphic units within the Gawler Province. The model has been exported to file formats suitable for viewing in Discover 3D, GOCAD or Adobe Reader