Calculating overburden

Important   Make sure overburden is included in the 3D grid, as overburden calculations start at the top of the grid.

On the Overburden form (MODEL > Geomechanics > 3D Grid Geomechanical Properties > Overburden) you create an overburden model for the 3D grid from an existing density property on the same grid.

To calculate the overburden property

  1. At the top of the form, under 3D grid, select the 3D grid for which you want to generate an overburden property.
  2. Under Density property, select the grid’s density property to use. Only properties with property type ‘Density’ are available to select.
  3. In the Output property text field, enter the name of the overburden property. The property will appear under this name in a newly created folder called 'Static Geomechanical Properties' under the 3D grid in the JewelExplorer.
    4. In case a property with this name already exists in this folder, it will be placed next to the existing property with a sequential number added to its name.
  4. If you have a water column, i.e. water exists above the top of your grid, and you want to include it in the overburden calculation, select the Apply water load checkbox:
    • In the Mean water level field, enter the water level relative to MSL. The difference between the top of the grid and the value entered here, will be the water column. For example, if the top of your grid is at -1000 m. (e.g. a plateau 1000 m. above MSL) and on top of the plateau is a lake of 10 m. deep, the value to enter is -1010 m.
      • In the JewelSuite convention, depth is positive.
    • Enter the water density in the Water density entry field.
  5. Click Apply to perform the calculation and keep the form open, or OK to perform the calculation and move to the next step of the workflow, Pore Pressure. Upon clicking, the overburden property is calculated and added to a newly created folder 'Static Geomechanical Properties' under the 3D grid in the JewelExplorer.