Batch LAS Options tab

 

The Options tab controls how Petra handles overlaps between curves already in the database and the selected LAS file.  This tab also enables a few options for loading non-standard or oddly-formatted LAS files.

Curve Update Mode

These options control how Petra handles naming overlaps between curves already in the project database and the LAS files.  The “Add New Curves and Replace Existing Curves” option allows for the creation of new logs and will completely replace any overlapping curves in the database with the LAS file data.  “Add New Logs Only” only creates new logs; when there’s an overlap between the database and the LAS file, the database won’t change.  “Add New Curves and Merge into Existing Logs” allows for the creation of new logs, and will merge data from the LAS file with the curves already in the database.  This merge operation can either prefer old values, non-null new values, or all new values.  “Add or Rename” allows for the creation of new logs, and will rename overlapping curve names with a numerical suffix (like GR_1).  For this example, select “Add or Replace Logs.”

Enable Sample Rate Round Off Correction Algorithm

This option corrects for depth round off errors caused by a non-standard sample rates (such as 0.1524), which are usually a consequence of converting logs measured in one depth unit into a different depth unit.  

Disable Error Scanning and Repair

By default, Petra scans for potential bad characters in the curve data and looks for data that is not space delimited. These conditions are not corrected if this option is checked.

Interpolate Missing Depths

Interpolates values over missing intervals in the LAS file.  This interpolation simply repeats the last good value.

Remove Special Characters From API Number

This option removes any nonnumeric characters from the API number in the LAS file.  Embedded blanks are converted to underscores prior to matching wells in the database.

Scan Depths and Use Minimum Sample Rate Found

Scans the depths and determines the minimum sample rate.

Match UWIs if there is at Least a XX Percent Match

Since this tool can bring a large number of LAS files at once, this tool allows some flexibility in matching UWI/API numbers from the LAS files to those in the project.  By default, Petra looks for an 80% match between the LAS UWI/API and the project well’s UWI/API.

Read Headers as Version

Sets the version number for the LAS files.  For reference, LAS version 1.2 was introduced in 1990, and LAS version 2.0 was introduced in 2009.  When in doubt, an individual LAS file’s version is listed at the beginning of every file.

Load all Logs into Original Well Completions

By default, Petra loads the curve names into the well that matches the LAS file’s API/UWI number.  This option instead loads the curves into the primary completion.

Append Following Source To Curve Name

Appends text to the end of the loaded curves’ names.