Using WizGen to create a TransGen runfile

WizGen allows the user to create a runfile (<Project>.TGDATA) which will control the calculations made by TransGen via ViewGen.

Press the fourth icon in the Control Menu to launch WizGen.

This launches the Title page of  WizGen .  New to the TransGen 3.0 release, at this point the user must choose if TransGen is to operate in "Basic project" or "Flexible project" mode. The choice of mode governs which pages are loaded into the program and hence what the user sees in WizGen and the range of choices available.

Basic project operating mode

The "Basic project" operating mode is intended for new or inexperienced TransGen users who only require access to a small set of prescribed methods for the calculation of fault-rock seal potential, thickness and permeability and hence faulted transmissibility. Using WizGen on a Basic project automatically creates the TGFSP strings and thickness and permeability plugins (i.e. essential THICK and PERM macros written in C++ accessed via the TGPLUGIN keyword) required in all TransGen runs. Using TransGen in Basic project mode will still provide a geologically meaningful model in most circumstances.

Flexible project operating mode

The "Flexible project" operating mode offers the more advanced user the opportunity to completely define the number and form of the Fault Seal Potential measures calculated. Plugins may be based on suggested examples or can be written and tested by the user within WizGen. The user may define new data variables, so that user data can be read into and/or manipulated in TransGen and used within plugins. FSP measures and user-defined variables can be output as connection or cell properties.

Two additional plugins can be used in "Flexible project" mode:-

the "CELLPROP" plugin is run (if present) at the very beginning of the calculations allowing the user to calculate the contents of new cell properties.

the "AREA" plugin is run (if present) immediately prior to calculation of transmissibility.

Include fault drag and hierarchical zone effects

Having selected the Flexible project operating mode, you can choose to toggle this separately licensed option "on" to include the effects of sub-resolution geometrical fault characteristics in the flow simulator such as:-

• the effects of user-defined faults not included explicitly in the geometry of the simulation model.


• the uncertainty in fault throw or of local geological drag on faults included explicitly in the simulation model.


• inclusion of fault relay zones and other forms of locally-paired slip surfaces on faults included in the input model as single surfaces.

NOTE:- This geometrical functionality (new to the TransGen 3.2 release) operates only on single-phase properties. Although TransGen can be run combining both this and the two-phase fault rock functionality, it will be internally contradictory. Combining the two sets of functionality is therefore NOT recommended.

Include two-phase fault rock calculations

Having selected the Flexible project operating mode, you can choose to toggle this separately licensed option "on" to use different relative permeability, across-fault flow rates and fluid property data for oil and water.

For a brand new TransGen project, the WizGen Title page will appear as shown above, with the controls (apart from Quit) inoperative (greyed-out) and neither the Basic project nor Flexible project mode selected.

For an existing TransGen Project, the WizGen Title page will appear as shown below with the operating mode in which the TransGen Project was previously run automatically selected and the controls activated, e.g. F64_basic.TGDATA in Basic Project mode.

An existing Basic project can either be re-run in "basic" mode with the same/different WizGen settings or upgraded to "Flexible project" mode by selecting the Flexible project option to allow greater flexibility in the number and form of Fault Seal Potential measures calculated and also with the options to either Include fault drag and hierarchical zone effects in the single-phase simulation model or Include two-phase fault rock calculations to take into account two phase flow changes in water and oil saturations in the transmissibility multiplier calculations.

NOTE:- A Basic project can be converted to a Flexible project, but not vice-versa. However, when a project is converted from basic to flexible, a copy of the "basic" TGDATA file is made and stored in a file called <Project_Name>.TGDATA.bak in the project directory, so the basic project can be restored if necessary.

The appearance and options presented in WizGen will depend on the operating mode selected.

Select either Basic project (recommended for new/inexperienced/basic TransGen users)
or Flexible project (for advanced users) and click on the relevant section below to use WizGen to create a TransGen run file (i.e. <project_name>.TGDATA) giving instructions to be used in ViewGen to calculate output.