Displaying Digital Logs Workflow

In the Profile View, there are a number of tracks in which digital logs can be displayed:

• Side Track (on the left side of the window) – 5 sub-tracks for digital log data
• Bottom Track 5 sub-tracks for digital log data
• Along wellbores (either vertical or horizontal) 1 track on each side of each wellbore

To open the Log Display Options Dialog from the Profile View

• Click the Digital Logs and Tracks Dialog button on the Tool bar
• Logs > Select Logs and Tracks

Log Display Options Dialog

When the Log Display Options dialog opens, it will automatically display all wells selected in the Profile view and the digital logs loaded into the Petra database for those wells.

To create a filter:

1. Click, Set Filter button to open Filter dialog.
2. Select a Filter Type from the drop down list (Well, Log, or Depth)
3. Select condition (Does / Does NOT) and operand (Contain, Equal,Start With, End With).
   Multiple conditions can be added, and filtering can be performed on Depths and Well Names in addition to Log names. Multiple conditions are applied using the and operator.
4. Click the Add button

5. To view the filtered logs in the main dialog, press Ok:
   • To remove the filter, simply un-check the Apply Filter check box.

Working with Tracks

To activate a track:

To activate a digital log, click the check box next to its row in the table. You can also adjust the width (in inches).

The blue highlight on the row selected indicates that you are working with that log curve in the settings panel on the right. To change the style and track settings of a different curve, simply click on its row to move the blue highlight color.

To change the style and track settings of multiple curves at the same time, simply control-click or shift-click on multiple rows. Settings will apply to all selected wells when you press “Apply.

To uncheck all digital logs that have been enabled, press the Clear All button.

Log Curve Settings

In the settings panel on the top right, the following tabs are available. Again, these settings all apply only to the well or wells highlighted in blue in the well and curve list.

The Scale tab is primarily used to select the log track and log scale limits. Scaling options apply to the highlighted log name in the wells and logs portion of the dialog (blue highlight).

The Style tab defines the appearance of each log trace. Color, line width, line style and shading options are provided. Color and style options apply to the highlighted log name in the wells and logs portion of the dialog (blue highlight).

The Cutoff tab provides options relating to how a log is shaded based on a user-defined cutoff value. Two colors are used to plot the log trace - one for values below the cutoff and another for values above the cutoff.  Shading can occur below or above the cutoff value.

CUTOFF = MEAN + (SD x USERVALUE)

The GeoColumn tab provides options for displaying a curve using "GeoColumn" shading. The GeoColumn feature shades a curve with multiple colors based on curve values.

The Misc tab provides options for configuring the header for each curve in the track.

Pressing the Apply button will update the “Profile View” with all of the changes you have made. You may need to move the dialog to the side to see the Profile View. The changes are not permanent until the OK button is pressed, which closes the dialog.

Advanced Options for Digital Log Curves

Traditionally, when drawing digital logs along a horizontal borepath, the logs may “loop” back onto themselves when the borepath has a high degree of curvature:

Petra uses advanced functionality to ensure the digital log curve maintains a useful appearance by drawing a tangent line along the borepath and using that line as the track edge for the log curve:

The settings for this advanced functionality can be found in the Track settings “Advanced” tab.