The
NTG Discretisation options are currently inoperative (greyed-out). This functionality will be implemented, sometime in the future, to select where shale is positioned within cells.
FSP units
The
FSP units control allows the user to alter the units for outputting Fault Seal Potential measures from the default in metres to native units,
i.e. to feet if Units set to FIELD or to centimetres if Units set to LAB (as set on the
Coordinate System page).
With the default
FSPs in metric selected, the
TGMETRIC keyword (new to TransGen 3) is automatically added to the TGDATA run file. With the TGMETRIC keyword included (activated), fault displacement, fault rock thickness and all calculated Fault Seal Potential measures are reported (both graphically & in output files) and stored internally within TransGen using metres as the unit of length.
NOTE:- The FSP units control is automatically locked to FSPs in metric "on" if the Include fault drag and hierarchical zone effects option has been selected on the Title page of WizGen.
HINT:- Depth is not affected by the TGMETRIC keyword which is always displayed and stored internally in the units of length appropriate to the TGDATA file.
The purpose of the TGMETRIC keyword is to ensure plugins are transportable between different UNITS conventions. Clay Smear Potential (CSP) for example has the dimensions of length. If the UNITS in TGDATA run file are set to FIELD, then CSP will be reported in metres if TGMETRIC is present and in feet if it is not. With the TGMETRIC keyword included (i.e. activated), this means a PERM plugin with a particular sealing threshold applied to CSP will not need to be changed if the same plugin is used in another reservoir modelwhich has been built using a different UNITS convention.
When the alternative
FSPs in native units is selected, the TGMETRIC keyword is omitted from the TGDATA file. With the TGMETRIC keyword missing from the TGDATA runfile, all fault displacement, fault rock thickness and all calculated FSP measures are reported in the units of length appropriate to the
Units specified on
Coordinate System page of WizGen,
i.e. feet if the Units are FIELD or cm if the Units are LAB. Inclusion or exclusion of the TGMETRIC keyword makes absolutely no difference if the
Units specified on the
Coordinate System page are METRIC.
If TGMETRIC is omitted by selecting the
FSPs in native units, many plugins will be specific to the UNITS convention for which they have been written.
Inclusion/exclusion of the TGMETRIC keyword does not influence the transmissibility calculation; dimensions of fault thickness are always converted back to the specified units system before transmissibilities are calculated ensuring consistency of units in the TRANX and TRANY files.
Lower limits
Unfaulted transmissibility cutoff:- any connection with an unfaulted transmissibility value less than the specified cutoff value will be ignored by TransGen. It defines the TGMINTR keyword in the TGDATA run file and follows the default value used in Eclipse which ignores connections with transmissibilities less than 1.0e-06. This cutoff is provided to allow TransGen to match Eclipse behaviour and should only be changed from the default value to mirror changes in the parent simulator run file.
Cell volume error tolerance:- this cutoff is used by TransGen as a precision limit for rejecting badly constructed cells and defines the TGVOLERR keyword in the TGDATA run file. It is different from the Eclipse limit of minimum cell pore volumes (Eclipse MINPV keyword) which TransGen also recognises. A cell is flagged as inactive by TransGen, if any component tetrahedra have a volume of less than minus this value or the total cell volume is less than this volume.
Cell pore volume cut-off:- this cutoff defines the MINPV keyword in the TGDATA run file, which is then used by TransGen to render inactive any cells which have a pore volume less than the defined threshold. This cutoff is provided to allow TransGen to match Eclipse behaviour and should only be changed from the default value (1.0e-06) to mirror changes in the simulator run file.
HINT:- Only change these default Lower limits either to reflect changes from the defaults in the parent Eclipse run file or in the case of Cell volume error tolerance to change the limit used to identify and exclude geometrically corrupt cells from the calculations in TransGen.
Do not perform calculation
By default, the
Do not perform calculation option is toggled "
off",
i.e. Fault Seal Potential measures on the
Fault Seal Potential Variables page of WizGen will automatically be calculated when
ViewGen is selected for the generated TGDATA run file.
If you want to use
ViewGen to just view the geometry of the current TransGen model prior to running any FSP and Transmissibility multiplier calculations,
click on the button to turn the
Do not perform calculation option "
on".
When the
Miscellaneous Options page is set as required,
click on the
Next>> button to view/edit the
Fault Seal Potential Variables page.
Alternatively,
click on the
<< Back button
to return to the
Included Data page to view/edit the data included in the current runfile.
Or
click on the
Contents button to access the
Contents page to view/edit any of the current TGDATA file settings, inspect the project's TGDATA file and/or inspect the log generated by last
ViewGen calculation.
Click on
Save to save any modifications made to the current TGDATA runfile.
Click on
Quit to exit from WizGen with or without saving the any changes to the TGDATA runfile.
