Tutorial: Display Stratigraphy Logs in 3D

Estimated time: 6 minutes.

In this lesson, you will get a quick view of all of the stratigraphy data as entered for the project's boreholes. You will look at how the data is entered, and you will generate a 3D diagram representing the borehole stratigraphy logs.

1. Be sure the "Samples" folder is still the current project folder (see Open a Project for information).
    
2. In the borehole file listing along the left side of the Borehole Manager, click on the borehole named "DH-04" to make it active.

3. Click on the Stratigraphy button to load the stratigraphic data for this hole.

   

   ! Note how the stratigraphic units are noted with a top and bottom depth, and a formation name. Missing data can be left blank (as in the Leadville Ls base depth above) and there are a set of "rules" which can help fill in the blanks. You can enter your formations or layers using regular words like "limestone" or "Leadville Ls."  In order to know formation order, and the colors and patterns to be used to represent them, the program relies on a reference library called a Stratigraphy Types Table. This is created by the user. A Stratigraphy Types Table is created for each project that has stratigraphy information. We’ll look at this in a minute.
    

4. Click on the borehole "DH-03" in the list to the left, and you’ll see the information listed in its Stratigraphy datasheet.

   Note how the formations must be consistent in order between boreholes.  The formations CANNOT repeat within a single borehole. ("Lithology" by contrast does not show organized layering.  See the lessons on lithology diagrams for more information.)

   If formations are missing from a particular borehole, you can either omit them altogether, or enter them with the same top and base as the formations above and below (and thus have zero thickness). The latter method allows for better pinching out of surfaces.  See Missing Formations for more details.

5. Look at the project's Stratigraphy Types Table:
   1. Click on the Stratigraphy Types button that sits above the stratigraphy data listings.

   

   You can also access the Stratigraphy Types table using the Project Manager pane along the left edge of the program window, in the Project Tables | Types Tables grouping.

   
    

   2. View the Stratigraphy Types table.

   

   A quick summary:

   • Order: Defines the order in which the formations are listed in the data tables, the order in which the stratigraphy layers are modeled, and the actual numeric values that will be assigned to the formations should you create a stratigraphic solid model.  Numbering starts with upper formations and increases downward.
     ! This is important. In your own work, be sure the formation order is defined correctly. To edit a value, just click in the cell and type in a new number.
   • Formation: The formation names in this project.
   • Pattern: The specific pattern in specific colors for the formation.
   • Fill Percent: Defines how much of the available space the pattern block should occupy in strip logs (less than 100% can show erosion, weathering).
   • Density: The rock density - used only for computing mass.
   • Show in Legend: Used to specify whether the unit's name is to be included in the diagram legends.  Un-checking an item doesn't remove it from the table itself, just from any subsequent legends that are created.
     ! This setting can also be used to limit the stratigraphic modeling to checked formations - helpful in your own work if you have a deep project with many stratigraphic units.
   • To add a row to the listing, just click in the lowest existing row and press the down-arrow key on your keyboard.
   • To delete a row from the listing, click in the row and type Ctrl+Del.

   3. Click on the OK button to close the Stratigraphy Types Table.
       
6. To create the 3D logs, click on the Striplogs menu, and then click on 3-Dimensional | Multiple Logs.

This window has several sections:
The left side is where general diagram settings are established.
The 3D Striplog Designer tab is where you establish the log-specific settings.  In this window:

• The left pane is where you choose what type of data is to be displayed in the logs (the Visible Items).
• The upper-right pane is where you see a plan-view preview of the active log items. You can drag the items to adjust their relative placement. 
• The lower-right pane displays specific settings for the Visible Item that you click on.
   

1. Establish the general diagram settings in the left pane. 
   • Clip (Truncate Logs Based on Elevation Range): Uncheck this.
   • Reference Cage: Check this.  A 3D grid of lines and coordinate labels will be included.
   • Include Lithology Legend: Uncheck this.
   • Include Stratigraphy Legend: Uncheck this. We'll add one interactively in RockPlot3D.
   • Include Well Construction Legend: Uncheck this.
   • Include Aquifer Legend: Uncheck this.
   • 
      
2. Click on the 3D Striplog Designer tab. 
   
   
   
   Choose the items you want to see in the logs by inserting a check-mark in the following items in the Visible Items section of the window:
3. • Title: The drill hole name will plot above the logs.
   • Stratigraphy: The logs will contain a column illustrating the stratigraphy units with cylinders of colors.  When the Stratigraphy column is selected, you'll see a green circle displayed in the plan-view Preview pane. 
     
     • Adjust the size of the column by dragging on one of the corner handles. Note the Column Radius setting in the lower-right Options pane. As you resize the circle, the Radius setting will be updated.  Drag the green stratigraphy circle until the Column Radius is about 1.0.
       ! You can simply type 1.0 into the Column Radius prompt, if you prefer.
     • Adjust the placement of the column relative to the axis of the log by dragging the circle in the Preview pane.  Be sure the green stratigraphy circle is on the center of the log axis.
       ! You can simply type 0.0 into the Offset Distance prompt, if you prefer.
   • None of the other Visible Items should be checked.

7. Click the Process button at the bottom Options window to proceed.
   
   The program will create a strip log for each borehole, including well name and stratigraphy column, and it will build a labeled reference cage around the logs.  The entire diagram will be displayed in a new RockPlot3D display tab. 
   ! Each time you click the Process button, the 3D display will be regenerated.

The instructions below will take you on a quick tour of RockPlot3D. This lesson will cover different items than were highlighted in the lithology tutorial.

As you can see, the image is displayed in the pane to the right, and the image components and the standard reference items are listed in the pane to the left, called the "data tree."

8. Adjust the background color for the display, by clicking the color button in the toolbar above the image display and making a selection. The program will remember the background color you select from session to session.

9. Adjust the reference items in the upper portion of the window's data pane.
   1. World Outline: Uncheck this - since there’s a reference grid in this image, the world outline is redundant.
   2. Axes: Turn this item off.
       
10. Practice rotating the image. The default viewing operation is "rotate" (see the button depressed in the toolbar ). Left-click and hold anywhere in the log display and drag to the left or right, up or down and see how the display rotates. Release the mouse button when you are done. Rotate the image again if you wish.
     
11. Set the view to a fixed viewpoint by clicking on the View | Above option. From the pop-up list, select North-East. Since the wells will appear lined up, rotate the image slightly to the left.
     
12. Add a stratigraphy legend so that you know what the different log intervals represent. (Remember that you can add the legend automatically during the generation of the logs themselves. This lesson just shows how to do so in RockPlot3D after the logs are created.)
    1. Select the Edit | Add Legend |Stratigraphy command from the RockPlot3D menu. You’ll see a legend inserted to the left of the image, and a new Stratigraphy legend item listed in the data tree to the left (Legends heading). 
    2. Double-click on the Stratigraphy item under the Legends heading, to access its settings.
    3. Click on the large Font button near the bottom of the window and set the font size to 9, and click OK to close the font window.
    4. Click the Apply button at the bottom of the Legend Options window to have the change applied to the view.
    5. Legend location: Finally, you can play with putting the legend on the Left Side or the Right Side of the image, clicking Apply any time you want a setting change applied. 
    6. You may want to adjust the Zoom percent if the legend is sitting on top of the log diagram.
       
    7. Click the Close button when you are ready to close the Legend Options window.
        
13. Now, let's create a saved viewpoint.
    1. Use the Rotate, Pan, and Zoom tools to adjust the scene to a viewpoint that you like.
    2. Save this viewpoint by selecting the View | Add View menu option.
    3. In the View Name window, type in a name that will be recognizable, such as "Northwest Zoomed In" and click OK.
    4. This can be saved with the 3D scene; to re-display your scene from the saved viewpoint, just double-click on its name under the Views heading in the Data tree. You can save as many Views as you like.
       
       
14. Save this 3D log data: Select the File|Save As command. In the displayed window, type in this name:   stratigraphy logs   and click the Save button. RockPlot3D will save this information on disk under that name, with a file name extension ".Rw3D". In later lessons, you can append these logs to other 3D diagrams.
     
15. Close the RockPlot3D window by clicking in the Windows Close button.

  3D Logs
 

  Back to Stratigraphy menu     |     Next (2D log section) 

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