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Two phase flow - FAULT ROCK PROPERTIES page

This is the Next >> page accessed in WizGen (in "Flexible Project" mode) from the Two phase flow - INPUT page or by selecting the Goto... button for Two phase flow - specify fault rock properties from the Contents page.

This page deals with the relationships for defining the two-phase petrophysical fault rock properties. As for single-phase fault rock properties, the two-phase properties are calculated for each faulted connection in the model.

The Two phase flow - FAULT ROCK PROPERTIES page of WizGen allows the user to set the equations (or 2Phase plugins) used to define:-
  • Fault porosity.

  • Water saturation at irreducible oil.

  • Irreducible (connate) water saturation.

  • Capillary pressure, Water relative permeability and Oil relative permeability for both Drainage and Imbibition.



    • The symbols used on this page are defined below.



    NOTE:- The value of fault permeability for each connection derives from the single-phase TransGen calculations included in the ViewGen run. It is therefore important that the appropriate single-phase properties are used in a ViewGen run, even if the particular run is being performed primarily for determining two-phase properties. Check the PERM and THICK plugins are set appropriately via the User-defined plugins page.

    Each of the 9 two-phase properties can be represented by an equation or a plugin. By default, all the relationships are represented by Equations and default values are supplied for all the equation constants. The default relationships are based on published, generally heuristically-derived curves and are discussed in further detail in Manzocchi et al. (2002; Petroleum Geoscience 8, 119-132).
    The value of any Equation constant can be changed -  double click on the current value, type in the required new value and then click on Save to save the new setting(s) to the TGDATA file.  

    To use a plugin rather than the default equation to define a particular two-phase property, click on the Plugin button for that particular fault rock property (e.g. as shown below for Fault Porosity and Drainage Capillary Pressure) - the Equation constants are greyed-out and cannot be edited.



    Having selected the Plugin option for one or more properties, you need to return to the User-defined plugins WizGen page to define the plugin(s).
    Click on the <<Back, Next>> or Save button to display the following Pop-up window. Click on Yes to return to the User-defined plugins page to edit the new plugins.



    When the Two phase flow - page 2 is set as required, click on the Next >> button to view/edit the Groupings and Output settings on the Two phase flow - page 3.

    Alternatively, click on the << Back button to return to the Two phase flow - page 1 to view/edit the settings defining the Input source for relative permeability, across-fault flow rates and fluid properties data.

    Or click on the Contents button to access the Contents page to view/edit any of the current WizGen page settings, inspect the project's TGDATA file and/or inspect the session log generated by last ViewGen calculation.

    Click on Save to save any modifications made on this page to the current TGDATA run file.
    Click on Quit to exit from WizGen with or without saving any changes to the TGDATA runfile.


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