Tutorial: Display Multiple Lithology Logs in a 2D Cross-Section

Estimated time: 6 minutes.

In this lesson, you will be creating an image representing the lithology data in multiple logs in the Samples project, selected along a multi-log cross section trace.

1. Back at the main program window, click on the Striplogs menu, and then click on the 2-D Striplog Section option.


2. Establish the section options: These are found in the Main Options tab of the Striplog Section window.
   • Vertical Exaggeration: This should be set to 1. In your own work, if your project area is large but your logs are shallow, this is a means of setting a vertical stretch for the section, before it's created, so that the border annotation is scaled well.
   
   
   • Striplogs: Click this tab to confirm that none of the sub-options are checked.
   
   
   • Log Spacing: Click here and be sure that this is set to Distance between Collar Locations.
   
   
   • Hang on Datum: Uncheck this.
   
   
   • Annotation: Check this. These options determine text and lines that will plot around the perimeter of the profile. Click on this tab to view the options; the factory defaults should be fine. See Restore Default Settings if you need more information about setting the factory defaults.

   

   • or Surface Profile: If you completed the borehole map section of the tutorial (jump back), insert a check in the Surface Profile option. This is used to display a selected surface in the cross section plot. If you DID NOT complete that lesson, leave this un-checked.
     • Click on this tab to access the Surface Profile options.
     • Grid Model: Click on the browse button to the right of the prompt and select the .RwGrd file representing the ground surface, named surface.RwGrd and click the Open button.
     • Polyline Attributes: Click this tab to define the line's appearance.
       • Line Style & Color: Click here to set the line style to red, medium thickness.
       • Smoothing factor can be set to 1.
       
       
   • Infrastructure: Unchecked.
   • Other 2D Files: Unchecked.
   
   
   • Peripherals: Check this item and click on its tab.
     • Pattern Key: Check this peripheral item to include a legend in the diagram.
       • Lithology: Check this item. Uncheck the other legend options.
     • You can position the Pattern Key using the peripherals cartoon area to the left - just click on the purple rectangle and drag it to the left or right side of the diagram space.

     

     • You can resize the Pattern Key by holding down the Shift key, clicking on the lower-right corner, and holding down the mouse button while you drag.
     • As you re-position or re-size, you'll see the actual settings to the right are updated.
     
     
3. Now let's move to the top of the window to adjust the log and section location settings.
   • Click on the 2D Log Design tab where you will establish the striplog options.

   The program will display the 2D log designer window. This window has three main sections:

   • 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 Preview of the active log items. You can drag the items to adjust their relative placement.
   • The lower-right pane displays specific Options for the Visible Item that you click on.

   a. Choose the items you want to see in the logs by inserting a check-mark in the following items in the left pane:

   • Title: The drill hole name will plot above the logs.
   • Depths: The logs will be labeled with depth tick marks and labels.
   • Lithology: The logs will contain a column illustrating rock types with graphic patterns and colors.
   • None of the other options, including Text, should be checked.

   b.  Adjust the arrangement of the visible log items: You should see four items in the upper Preview pane: title, depth bar, log axis, and lithology patterns.

   • Practice clicking on an item, holding down the mouse button, and dragging it to the left or right in the preview.
   • Try getting the items aligned in the following order:

   

   ! Note that the log axis is always activated. It acts as the anchor point for the log - it is the axis that will be placed at the actual log location in the diagrams. The log title is always placed atop the axis.

   c. Check the options for each visible item by clicking on the item's name in the listing; its various settings will be displayed in the Options pane.

   • Click on the Lithology item.

   

   
   
   • Locate the Column Title option. Delete any text that is displayed in the prompt for the column title.
   • Click on the setting displayed to the right of the Width item, just above the title. In the prompt type in:  1   

   ! All log item sizes are expressed as a percent of the dimensions of the project, so the width of these logs will be about 1% of the project dimensions.

   
   
   • Location Map: Find this tab to the right of the 2D Log Design tab. Check this item. This will create a small map that shows the location of the section in the study area. Click on this tab to change:
     • Output Options: Click this tab at the bottom of the window.
       • Append Map to Diagram: Click in this radio button. Be sure the Size setting is set to Medium.
       
       
       
   • Section Location: Click on this tab, to the left of the Location Map, to pick the boreholes to display.
     • Click on the Clear button at the top of the panel-picking window. The program remembers your cross section traces from session to session; this will clear any old traces from memory.
     • Next, locate the hole titled DH-31 (top, just left of the center) and click on it. It will be marked with a red X.
     • Locate hole DH-18 south of 31 and click on it. A line will be drawn between the holes.
     • Locate hole DH-21 south of 18 and click on it.
       ! If you make a mistake, click the Undo button to undo the last pick or the Clear button to clear the map entirely for starting over.
     • Click on DH-36, DH-01, DH-35, and DH-13 continuing the cross section southward through the project area.
     • You should see a trace like this:

     

     
     
4. Faulting: Click this tab to set up your Faulting Options in your striplog display and to modify fault options. (Read this for more details.)


5. Click the Continue button at the bottom of the 2D Striplog Section window when you are ready to create the log section plot.

RockWorks will create strip logs of each of the selected borings using the selected settings. The logs will be spaced proportionally to their distance from each other on the ground.
In addition, it will create a map that displays the location of the section slice within the study area and append it to the cross section.

The completed log section will be displayed in a RockPlot2D tab in the Options window. RockPlot2D is where 2-dimensional maps, sections, and other diagrams are displayed.



6. Adjust the Vertical Exaggeration: The VE prompt, in the upper toolbar, is still shown at 1, meaning that the section's length (horizontal) and elevations (vertical) are being plotted at the same scale. In your own work, you may find that your distance and depth units aren't so agreeable, and you’ll need to apply some stretch to your images to get a good look.
   1. You can use either the Stretch button to fill the screen at whatever scales, or
   2. You can adjust the vertical stretch specifically by clicking on the VE button (or choosing View | Vertical Exaggeration) and typing in a desired value.
   
   
7. Edit the Section Title: In RockWorks you can edit the entities in the plot window.
   1. Click on the Edit arrow in the upper-left corner.
   2. Double-click on the Cross Section A - A' title
   3. Click in the color box and change the color to red.
   4. Click the Apply button. This change will be displayed in the plot window.
   5. Click Close to close the Text Attributes window.
   
   
8. Save these images for later work in the ReportWorks program, where you can create a nice layout of the log profile and the section location map.
   1. With the cross section still displayed in the RockPlot window, click on the File menu above the plot window, choose Save, and type in the name: Lith Log Section      and click Save. The program will save this image in its own .Rw2D file format.
   2. You can close this RockPlot window by clicking the X at the top-right corner.
   
   
9. If you’d like to do the ReportWorks lesson at this time, click here.


10. Otherwise, continue on with the lithology diagram lessons, below.

See also: RockPlot2D tutorial

Displaying Multiple Logs in a 2D Hole to Hole Section, Hole to Hole Sections versus Profile Sections

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