Setting multipliers per fault

The permeability of a fault (and therefore cross-fault flow) is controlled by tectonic smearing and mixing of clay from the slipped reservoir stratigraphy. This geological variable is captured from the model grids, which is input to the The Fault Seal Modeling workflow, which is the preferred workflow to determine fault transmissibility.

It is possible to specify unconstrained fault transmissibility multipliers on a fault by fault basis with the TM per Fault form (model > Fault Seal > Zone to Zone Transmissibility Multipliers > TM per Fault). Under normal circumstances, FTM will be a value between 0 (sealing) and 1 (fully conductive). Faults for which you do not specify FTM will receive a default value of 1.

The FTMs you specify with the TM per Fault form are represented by the variable 'FTM' in the total transmissibility calculation (see the formula in The Zone to Zone Transmissibility Multipliers workflow). The calculation takes place in the simulation workflows (IMEX, GEM, STARS, ECLIPSE and tNavigator) of the simulate strip. Each FTM which has not been deliberately set by you will receive a default value of 1 (fully conductive).

To set fault transmissibility multipliers (FTMs) per fault

  1. Open the TM per Fault form and select the Z2Z Multiplier Model of interest from the Model drop-down list. All fault sets associated with the selected model are listed in the 'Fault Sets' table on the form.
  2. Select the fault set which contains the faults for which you want to specify FTMs.
  3. In the 'Multiplier' column of the 'Fault Transmissibility Multipliers' table, enter the FTM value for the fault of interest.
  4. Repeat this for each fault (select other fault sets if necessary) that you want to give an FTM. All multipliers that are not set will receive a default value of 1.
  5. When you finished, click OK to apply the changes to the Z2Z Multiplier Model and close the form, or click Apply to apply the changes and keep the form open.