Session Log window

This is the Next >> page accessed in WizGen from the Project (TGDATA) File page or by selecting the Goto... button for the Inspect the log generated by last TransGen calculation option from the Contents page.

The Session Log is automatically generated when a saved version of the <Project>TGDATA file is run by clicking on the ViewGen icon in the TransGen Control Menu. Each step in the ViewGen run is given a new number.   

The Session Log will report errors encountered during a ViewGen run, including report(s) of defective cells, as well as missing or defective keywords in the TransGen TGDATA runfile.

Each step in the TransGen run is given a new number in the Session Log.  Warning messages are prefixed by an exclamation mark.  

Use the scroll bar on the right of the window to browse up and down the file.

The five blue control buttons at the bottom of the window are the same as the Project (TGDATA) File window and have the following effects:-

<< Back button returns the user to the Project (TGDATA) File window.

Next >> button opens the WizGen Contents Page.

Contents button opens the WizGen Contents Page.

Save button to save the current <Project>.TGDATA runfile settings.  The button will be greyed out and inoperative if the current settings of the <Project> TGDATA file have already been saved.

Quit button exits WizGen without saving the <Project>.TGDATA file.

When reading the ZCORN section, a number of 'flat' cells will not be read in if they have zero thickness (i.e. four coincident Z values for the top and bottom of the grid block ).  They typically occur at unconformities. These cells have no volume,  have no connections and support no flow and are ignored by TransGen.

After reading the END statement, TransGen will report the number of geometrically valid cells.  Some of these may be switched "off" by an ACTNUM keyword, or by having a zero permeability or porosity.  As Eclipse ignores these inactive cells, by default TransGen does not display them, but optionally for QC purposes they may be viewed in ViewGen.  These cells may contain Vshale or NTG data which is used by the SGR calculation.  However, no connections will be made to faulted inactive cells.

After reading the END keyword, TransGen also reports the number of grid-blocks that have net pore volumes less than the limit set by the MINPV keyword.  TransGen, like Eclipse, treats cells with net pore volumes less than MINPV as inactive.  These should typically have small volumes. Cells with large negative volumes are the result of corrupt geometries.  These 'concave' cells are often the result of crossing COORD lines and should be investigated.  The location of these cells is given in the log file and whilst inactive cells are invisible by default in the viewer, they can be selected and displayed.

TransGen reports the amount of memory used as a guide to the optimum hardware requirements.

When a layer has been eroded from one side of a fault, typically the footwall, TransGen cannot determine the displacement for a layer directly from the data, but instead has to estimate the displacement from the adjacent layers.  In the case of footwall erosion it will use the displacement from the lower layers which are present on both sides of the fault.  TransGen reports when this occurs, and it is an indication that it is worth checking that the correct method is used for calculating SGR.  Where footwall erosion is present, SGR may be best determined from the hangingwall only.

Faulted connections with transmissibility multipliers less than the multiplier cutoff limit will be ignored.  The number of these ignored connections will be reported by TransGen.