Configure Model Settings

The Model tab controls the number of nested structures and the parameters used to fit the associated variograms. Also see Set the Nugget on a Variogram Model and Set Nested Structures on a Variogram Model.

Note: The settings available on the Model tab differ depending on whether the Continuity Models component or a directional variogram component is selected.

Activity Steps

  1. Display the Continuity Model or directional variogram.
  2. Select the Model tab in the Property Panel.
  3. Configure the following settings as required. 
    • Model field group:
      • Auto Fit – Apply the auto fit algorithm to the three-directional and the downhole variograms as a group. Enabled structures and their structure types are honoured.
      • Fix nugget – Fix the nugget to prevent it from being moved by the Auto Fit algorithm.
      • Nugget
      • Structure (1, 2 and 3) – Whether to enable structures on the variogram.
      • Model Type – Type of structure. Select from:
        • Spherical
        • Exponential
        • Gaussian
        • Power
        • Hole effect
        • Dampened hole effect
        • Spheroidal (LF)
      • Variance
      • Range
      • Total Sill – Value to fix total sills to. Structure sills are adjusted accordingly.
      • Fix – Whether to fix the Total Sills value.
      • Copy
      • Paste
    • Options field group:
      • Link – Link the sills or ranges of the variograms in the group defined by this variogram's GroupID (> 0). Select from:
        • None
        • Sills
        • Ranges
      • Link downhole – Link the downhole model with the three-directional models.
      • Lock sills – Lock the sills of the variograms in this variogram's group.
      • Lock ranges – Lock the ranges of the variograms in this variogram's group.
      • Link nugget only – Link the downhole model nugget only with the three-directional models. Only available if Link Downhole is checked.
      • Constrain draggers – Constrain draggers so that they can only be moved within the space controlled by their own respective parameters. For example, it prevents dragger 2 from pushing dragger 3 to the right.
      • Invert model – For some variogram types, the graph starts at the sill and approaches zero, so a traditional model needs to be inverted to better fit the graph.
      • Spheroidal Alpha – Spheroidal model Alpha value. Only available if one of the structure types is set to Spheroidal (LF).
      • Variance – Round all variance values to the nearest factor of this number.
      • Range – Round all range values to the nearest factor of this number.