This example aims to familiarize the user with the different options for geostatic initialization. For this purpose a 3000m  3D shale column will be used. Initialization of the model is performed by defining an initial porosity trend with depth and initial pore pressure distribution. Gravity is ramped up during the geostatic stage in order to calculate and apply the vertical effective stress. Lateral stresses may be optionally ramped up with a defined ratio to the vertical effective stress. Specific issues considered are:

1.Datafile set up for geostatic initialization with a prescribed porosity trend (Geostatic_data, Spatial_variation_definition, Spatial_variation_values)

2.Data for prescribing different initial pore pressure distributions, with and without overpressure

3.Staged geostatic initialization for reinitialization of the displacements

 

View of the model mesh

 

Simulation Cases

 

Case 1 Base Case description

 

Case 2 Overconsolidated porosity trend

 

Case 3 Displacement reinitialization

 

Case 4 Initialization with initial overpressure

 

A full description of the data required for model initialization to a prescribed porosity trend is provided in Case 1 Base Case description