Fault Properties menu in ViewGen

Click on Fault Properties in the ViewGen menu bar to access the list of properties which can be selected for display on the faults.

The Fault Properties menu consists of  a variable length list of items from which one at a time can be selected as the "active" property for display on the fault(s).  Properties for which no data have been calculated in the current TransGen run will be greyed out and unselectable. The currently active property is indicated by a green index, as shown above for Trans. multiplier.

NOTE:- To display the currently selected Fault Property in the viewer window, the Show faults option must be toggled "on" in the Edit menu with appropriate Fault controls and Fault colours settings.

Trans. multiplier

Select this option to display the transmissibility multiplier values calculated by TransGen, i.e. the ratio of faulted and unfaulted transmissibilities at each point on the fault surface.

For details on how these values are calculated when using WizGen in Basic project mode, see Transmissibility Multiplier calculation in the Technical Description of what TransGen does.

HINT:- When using WizGen in Flexible project mode, these computed Transmissibility multiplier values can be selected for output to file via the TRMULT(C) option on the Output - derived and user-defined properties page.

Faulted trans.

This is the across-fault transmissibility calculated by TransGen per connection and displayed as either raw (average) or normalised per unit area (average/area).  It is the transmissibility across the fault when the effect of fault-zone material is included.  For consistency with ECLIPSE, transmissibility units are as follows:-

  in metric units:    0.008527*milliDarcy-metres

  in field units: 0.00127*milliDarcy-feet

  in lab units:   3.6*milliDarcy-cm.

In each case the numerical value is Darcy's constant (CDARCY) for that set of units.

For details on how these values are calculated when using WizGen in Basic project mode, see Faulted Transmissibility calculations in the Technical Description of what TransGen does.

HINT:- When using WizGen in Flexible project mode, these computed Faulted transmissibilities can be selected for output to file via the FTRANS (C) option on the Output - derived and user-defined properties page.

Unfaulted trans.

This is the across-fault transmissibility calculated by TransGen per connection and displayed as either raw (average) or normalised per unit area (average/area).  The unfaulted transmissibility values are those calculated across fault juxtapositions, BUT for which the effect of the fault-zone material is ignored (i.e. the input model).

For details on how these values are calculated when using WizGen in Basic project mode, see Unfaulted Transmissibility calculations in the Technical Description of what TransGen does.

HINT:- When using WizGen in Flexible project mode, these computed Unfaulted transmissibilities can be selected for output to file via the UFTRANS (C) option on the Output - derived and user-defined properties page.

Permeability

This is the fault rock permeability in milliDarcies, calculated in TransGen from the Fault Seal Potential measure(s) (i.e. SGR and/or CSP as set on the Fault Rock Properties page when using WizGen in Basic project mode or as defined in the PERM plugin of WizGen in Flexible project mode). The Permeability data can be displayed as a single averaged value for each connection (average) or with the values at each connection vertex interpolated across the connection (smoothed).

For details on how these values are calculated when using WizGen in Basic project mode, see Fault Permeability Calculation in the Technical Description of what TransGen does.

HINT:- When using WizGen in Flexible project mode, these computed Permeabilities can be selected for output to file via the PERM (C) option on the Output - derived and user-defined properties page.

Displacement

This is the fault slip, i.e. offset of cell corners from one side of the fault to the other measured in the direction of the COORD lines.  In TransGen, displacement is always calculated assuming the displacement vector of the fault is parallel to the COORD lines used to construct the 3D model geometry.  The units depend on the model units. It can be displayed as a single averaged value for each connection (average) or with the values at each connection vertex interpolated across the connection (smoothed).

Thickness

This is the thickness of the fault zone, calculated from the amount of displacement (for further details, refer to the section on Fault Thickness Calculation in the Technical Description of TransGen).  The units depend on the model units. It can be displayed as a single averaged value for each connection (average) or with the values at each connection vertex interpolated across the connection (smoothed).

For details on how these values are calculated, see Fault Thickness Calculation in the Technical Description of what TransGen does.

HINT:- When using WizGen in Flexible project mode, these computed fault-zone Thicknesses can be selected for output to file by setting the THICK (C) option on the Output - derived and user-defined properties page.

Overlap area

This is the area of overlap between any two juxtaposed cells.  This area is a polygon defined by the vertices at the top or bottom of the cells.  The units depend on the model units, e.g. square metres, square feet.

Depth

The depth of each connection calculated as the average depth of each connection vertex.

Dynamic data

Select this option to allow the display of Eclipse generated dynamic data from restart files as a fault property (See section on using the Dynamic Controls for details).
The dynamic data that can be viewed as fault properties are:

FLOWATN (water flow through the faulted connection)

FLOOILN (oil flow through the faulted connection)

FLOGASN (gas flow through the faulted connection)

DARCY_VEL

This user-defined connection property will appear as a displayable fault property if:-

Include two-phase fault rock calculations has been selected on Title page of WizGen (in Flexible Project mode)

DARCY_VEL has been declared as a connection property on the User-defined keywords page of WizGen

The associated file defining the across-fault flow rates for Two-Phase flow calculations has been loaded via the Included Data page of WizGen

HINT:- None of the internally-derived two-phase fault rock properties (e.g. capillary threshold pressure, porosity, connate water saturation, effective water saturation, etc.) can currently be visualised directly in ViewGen. However these properties can be viewed using a workaround using the single-phase plugins and user-defined cell properties (see section on Displaying two-phase fault rock properties in ViewGen below).

Which other Fault connection parameters are available on Fault Properties menu will be determined by the settings in the current TGDATA run file.

Fault Seal Potential measure(s) in a Basic project

If fault properties are calculated using a TGDATA runfile created via WizGen in "Basic project" mode, either sgr (Shale Gouge Ratio) and/or csp (Clay Smear Potential) will be available for display on the faults (depending on the settings made on the Fault Rock Properties page of WizGen):-

sgr

This is the Shale Gouge Ratio, a prediction of the shale content of the fault zone (expressed as a proportion) assuming shale material is incorporated into the fault gouge in the same proportions as it occurs in the wall rocks of the slipped interval (for further details, refer to the section on Calculation of SGR in the Technical Description of TransGen). It can be displayed as a single averaged value for each connection (average) or with the values at each connection vertex interpolated across the connection (smoothed).

csp

This is the Clay Smear Potential, a measure of clay smear thickness incorporated into the fault zone based on shale source bed thickness and displacement distance (for further details, refer to the section on Calculation of CSP in the Technical Description of TransGen). It can be displayed as a single averaged value for each connection (average) or with the values at each connection vertex interpolated across the connection (smoothed).

Fault Seal Potential measures/Connection properties in a Flexible project

If fault properties are calculated using a TGDATA runfile created via WizGen in "Flexible project" mode, up to 5 different Fault Seal Potential measures as defined on the Fault Seal Potential Variables page of WizGen, and any user-defined Connection Properties imported into TransGen and/or calculated in a user-defined THICK or PERM plugin will be available for display on the faults.

HINT:- When using WizGen in Flexible project mode, these computed values can be selected for output to file on the Output - derived and user-defined properties page.