Checkshot Import Options

In addition to checking the SRD of checkshots to be imported (discussed in the Seismic Datum Adjustments section) there are three additional options that control how checkshots are imported in Petrel. These are highlighted below:

  1. Automatically import default wellbore checkshot
    If this option is enabled the default checkshot on imported wells are imported when the well is imported.

  2. Activate checkshots on import

If this option is enabled then after a checkshot is imported it will be set as the active checkshot on its parent well and a time log created for the well to allow time-depth conversion of the well and its associated data.  Because activating a large number of checkshots in Petrel may take considerable time, this option is disabled by default.  Even if checkshots are imported with this option disabled, a user may later activate the imported checkshots using the normal Petrel procedures.

  1. Apply display shift when importing checkshots

Some data sources (like OpenWorks) define a display shift on a checkshot that is to be applied when this checkshot is to be used for time-depth conversion.  If this option is enabled then the time values of the checkshot will be shifted by its associated display shift during import.  

Note: If such a checkshot is then edited in Petrel and saved back to its source project this display shift will be backed out during the export process. If, however, the checkshot is exported to some other project then the checkshot is exported without undoing the display shift (and the DisplayShift attribute is set to 0 on export).

  1. Replicate shared checkshots

Some data sources (like GeoFrame) allow a checkshot that exists on one well to be "shared" to other wells. This means that the time-depth relationship defined by the shared checkshot will be used by all wells that "share" this checkshot.  Normally, the OpenSpirit Adapter preserves this sharing concept when importing shared checkshots - only checkshots that are "owned" by its parent well will appear in the Global well logs folder in the Petrel Input tree and if this checkshot is "shared" to other wells then the shared checkshot will be used to calculate the time logs for these other wells.  This is the default behavior in the OpenSpirit Adapter.

If this option is enabled, however, a shared checkshot will be copied to the wells that are sharing another well's checkshot so that it appears that every well has its own checkshot.  This option may be useful if you wish to make a copy of the shared checkshot in order to use as a starting point for editing of the checkshots on individual wells to better match an observed time -depth relationship (e.g. well-seismic correlation).