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

Estimated time: 9 minutes.

In this lesson, you will be creating an image representing the Gamma and Resistivity measurements as curves in multiple logs in the Samples project, selected along a multi-log cross section trace.

1. Be sure all of the boreholes in the project are enabled by clicking on the Edit|Enable All Boreholes menu option or toolbar button.
   
2. Click on the Striplogs menu, and then click on 2-Dimensional | 2D Striplog Section. (What's the difference between "profiles," "sections," and "projected sections"? Click here.)
   
3. 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.
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   • Striplogs: Click this tab to confirm that none of the sub-options are checked.
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   • Log Spacing: Click here and be sure that this is set to Distance between Collar Locations.
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   • Hang on Datum: Uncheck this.
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   • 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.

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   • 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.
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   • Faults: Unchecked.
   • Infrastructure: Unchecked.
   • Other 2D Files: Unchecked.
   • Peripherals: Unchecked.
   • Border: Unchecked.
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   • Output Options: Use these settings to determine whether the diagram is to be displayed, saved in advance, and/or exported.
     • Display: Checked.
     • Save: Unchecked. We will save the diagram in the viewer.
     • Export: Unchecked.
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4. Now let's move to the top of the window to adjust the log and section location settings.
   • Spatial Filtering: off
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   • Time Filter: off
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   • Strat Rules: Defaults will be fine here since we are not plotting any stratigraphy data.
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   • Click on the 2D Log Design tab where you will establish the striplog options.

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     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.
     • P-Data #1: The logs will contain a column illustrating P-data values as a curve down the log.
     • P-Data #2: The logs will contain a second column illustrating P-data values as a curve. You can activate up to 4 P-Data columns.
     • None of the other options, including Text, should be checked.
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     b. Adjust the arrangement of the visible log items: You should see five items in the upper Preview pane: title, depth bar, log axis, and two P-Data columns.

     • 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. The axis 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 options will be displayed in the Options pane.

     • Click on the Title item at the top of the list. You'll see Title Options displayed below and to the right.
       • Font: Click here and set the Size to Medium, and click OK.
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     • Click on the P-Data #1 item. You will see the options displayed below and to the right.
       • Track: Click to the right and choose Gamma as the data to be displayed in this log column.
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       • G-Value Filter: Unchecked.
       • Resample: Unchecked.
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       • Column Layout: Click this tab.
         • Width: Set the Width to 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.
         • Column Title: Choose Automatic.
           • Uncheck Include Data Range within Title.
         • Subdivisions: Be sure this is checked.
           • Intervals: 5
           • Plotting Sequence: Background
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       • Scaling: Set this to Automatic with Logarithmic unchecked.
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       • Fill Options:
         • Fill Region within Curve: Check this option.
           • Set this to Monochromae, and choose a color.
           • Fill Style: Choose Entire Curve.
         • Plot Line: Check this. Click on the sample and select a thin line, Red color.
         • Direction: Choose Right to Left.

         • ! You can drag the splitter between the Preview and the Options panes to create space, if necessary.

         • The remaining defaults should be OK.
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     • Click on the P-Data #2 item.
       • Track: Click here as necessary to set the data column to Resistivity.
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       • G-Value Filter: Unchecked.
       • Resample: Unchecked.
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       • Column Layout:
         • Width: Set this to 1.
         • Column Title: Choose Automatic.
           • Uncheck Include Data Range within Title.
         • Subdivisions: Check this.
           • Intervals: 5
           • Plotting Sequence: Background
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       • Scaling: Set this to Automatic.
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       • Fill Options:
         • Fill Region within Curve: Check this option.
           • Set this to Monochrome, and choose a color.
           • Fill Style: Choose Entire Curve.
         • Plot Line: Check this. Click on the sample and select a thin line, Blue color.
         • Direction: Choose Left to Right.
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   • 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:
     • Map Overlays: Checked.
     • • Borehole Locations: Checked.
     • Output Options: Click this tab at the bottom of the window.
       • Display Map as Separate Diagram: Click in this radio button. Be sure the Display option is checked.
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   • Next, pick the boreholes to display.
     • Click on the Section Location tab.

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     • If you don't see the section trace pictured below, follow these steps; otherwise jump to #5 below.
     • 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-23 (in the middle-left) and click on it. It will be marked with a red X.
     • Locate hole DH-03 to the east of DH-23 and click on it. A line will be drawn between the holes.
     • Locate hole DH-36 east of DH-03 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 slate for starting over.
     • Click on DH-05, DH-41, and DH-22, continuing the cross section across the project area.
     • You should see a trace like this:

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5. Click the Continue button at the bottom of the window to proceed.

   The program 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. The completed cross section will be displayed in a RockPlot2D tab, where 2-dimensional maps and other diagrams are presented.

   In addition, it will create a map that displays the location of the section slice within the study area. The completed map will be displayed in a second RockPlot2D tab.

6. Click on the Section tab and zoom into the display by clicking on the Zoom button and drawing an enlargement rectangle as shown below.

   

7. Edit one of the log titles.
   1. With the display still zoomed in, click on the Edit button in the upper toolbar.
   2. Double-click on one of the log titles. You'll see a Text Attributes window.
   3. Set the color to blue.
   4. Click the Apply button at the bottom of the Attributes window.
      You should see the log's title displayed in blue text now.
   5. Click Close to close the Attributes window.
      
8. Repeat this process if you like, for any additional labels. You can use the scroll bars along the bottom and side of the window to reposition the cross section within the zoomed window.
   
9. Save these images for later work in the ReportWorks program, where you can create a nice layout of the log profile.
   1. With the cross section still displayed in the RockPlot window, choose File | Save, and type in the name:   Pdata Log Section   and click OK. The program will save this image in its own Rw2D file format.
   2. Click on the RockPlot tab where the map is displayed. Choose File | Save, and type in:   Log Section Map   and click OK.
   3. You can close the window by clicking in the close-window button (X).
      
10. If you’d like to do the ReportWorks lesson at this time, click here.
    
11. Otherwise, continue on with the P-Data model & isosurface lesson, below.
    

See also: RockPlot2D tutorial

Displaying Multiple Logs in a 2D Hole to Hole Section

  Back to P-Data menu     |     Next (model & isosurface) 

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