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Building a Geological Model

Once a project has been set up and data imported, building a geological model is a process of successive refinement made up of two main steps:

A fault system can also be defined that divides the geological model into subunits in which the internal structure can be defined independent of the other subunits in the model.

This topic describes the first step in defining a geological model that is a simple volume enclosing the model extents. See Refining a Geological Model for information about refining the boundaries and modelling the lithological units.

A geological model can be created using only a basic set of parameters. The only parameter that cannot be changed once the model has been created is the base lithology.

To create a new geological model, right-click on the Geological Models folder and select New Geological Model. The New Geological Model window will open, together with a set of controls in the scene that help in defining the model extents.

Selecting the Base Lithology

Select the drillhole data column that will be used as the basis of a model from the Base Lithology Column dropdown list. If you do not wish to use lithology data as the basis for the model, select <None>. This may be the case if, for example, you want to build a model from points data or from an imported map. If you select <None>, you will need to manually define the lithologies that will be modelled.

If more than one column of lithology data is available for creating models, be sure to choose the correct one as it cannot be changed once the initial model has been created. If after creating and modifying the model, you find you need to modify the drillhole data, resulting in a new lithology column, you can use that new column to create contact surfaces using Other Contacts options.

You can also filter the drillhole data used to build the geological model using query filters. To do so, tick the Filter Data box and select the required query filter from the dropdown list. Once the model has been created, you can remove the filter or select a different filter.

Setting the Surface Resolution

The surface resolution setting Leapfrog Geo automatically uses as the default is based on the data available in the project. Set the surface resolution for the model as a whole and choose whether or not the resolution will be adaptive. See Surface Resolution for a Geological Model for more information on the effects of these settings and how they apply to individual contact surfaces.

Later, while refining the model, you can change the resolution of each surface and enable or disable adaptive resolution.

Setting the Model Extents

A geological model is initially created with a basic rectangular set of extents aligned with the south/north and east/west axes. You can define the model’s extents in three ways:

See Setting Object Extents for more information.

Creating the Model

Enter a Name for the model that describes the purpose of the model. This Name will be used in naming the objects that will be added to the model.

Click OK to create the new model. The new geological model will be created and added to the Geological Models folder. The objects under the geological model in the project tree represent different parts of the model:

Display the geological model by dragging it into the scene or by right-clicking on it and selecting View Output Volumes.

See also: