Log Crossplot Set Depths

It’s often useful to limit the crossplot’s data points to a specific interval of interest.  Data points can be constrained by zone definition, tops, or by a specified depth (MD or TVD).

On the menu bar at the top of the screen, select Depths>Set Depths… from the menu bar at the top of the screen.  Alternatively, select the button on the toolbar at the top of the Crossplot Module.  This opens the Depths tab on the Log Cross Plot Data Definition screen.  

Zones

To set depths by a zone’s interval definitions, select the “Set Depths From Zones” button.  Next, select the desired zone.  Note that the WELL zone by default covers -1M MD to +1M MD, so it should cover the entire footage of all wells.  If the tops used in the zone interval definition are missing for a well, Petra will not display the log plot.  

Set Depth From Range

To set depths by tops or by a specific depth range, select the “Set Depth From Range” button.  Next, select the “Set Range” button.  In the Set Depth Range box, select the relevant top, MD, or TV Depth button.  For MD and TVD, select the relevant button and enter the adjacent depth in the entry field.

Tops

For tops, select the desired top from the “Fm Top Name” dropdown box.  Notice that an offset can also be added or subtracted to the fm top; this offset will include data points above or below the actual fm top depth.