Pick Contacts Part 2: Using the Contact Picker

Step 6: Pick the First Formation

The Contact Picker window will be comprised of four main sections:

The process of picking the formations is as simple as (1) selecting the formation to be recorded, in the Active Contact(s) pane and (2) clicking on each log where that formation appears present, in the graphic pane. The program will record the depths in the lower table.

Here's a more detailed step-by-step:

  1. If the logs appear too squashed for good visibility, you can adjust the Vertical Exaggeration (default = 1). You can adjust the size of the window, as well as the panes within the window by dragging on the pane boundaries and dragging.
  2. Select the first formation you wish to pick by inserting a check in its check-box in the upper-right window.
    ! You can select more than one unit if you like.
    ! So, if you'd like to pick the base of the upper formation AND the top of the next formation, insert a check in both boxes.
  3. To mark the top of this formation you will click the left mouse button at the point on the first log where you think that formation top would lie.
  4. The program will post that depth in the data table, in that formation’s Top column, for that log. If you make a mistake, see Tips.

  5. Continue selecting that formation’s top on the remaining logs. It is not necessary to click on the logs from left to right, but that may help keep you organized. You may skip logs if you don’t think that formation is present there. You will see a line connecting the formation tops you've picked, in the color displayed for the unit. Each pick will also be marked with a small arrow.
  6. The program will post the depths to the data listing.

Step 7: Pick the next formations.

  1. Now, select the next formation to be picked by inserting a check in its box, to the upper right.
    ! You can select more than one unit if you like.
    ! So, if you'd like to pick the base of the upper formation AND the top of the next formation, insert a check in both boxes.
  2. Start back at the first log and left-click at the proper depth to select the selected formation(s).
  3. The program will post the depth(s) in the proper column(s) for that log.

  4. Continue selecting the selected formation(s) on the remaining logs. Note how the unit's color will be displayed as as a correlation reference.
  5. Next, clear the check-boxes in the upper-right for the formation(s) just picked, and select the next unit(s) to be picked by inserting checks in the appropriate box(es).



Step 8: End the session

  1. When you are ready to terminate the formation picking session, click on the Exit button.
  2. The program will offer you some important choices; choose one:
  3. Click OK.
  4. The program will close the Contact Picker, discarding or saving or adjusting and saving the data as requested.

Contact picker - what next?

Now that you have the stratigraphic units defined, use the Striplogs menu to create log-based section and 3D diagrams (RockWorks Basic). Use the Stratigraphy menu tools to interpolate surfaces for the formations and generate diagrams - 3D models, profiles, cross-sections, fence diagrams, etc. (RockWorks Standard and Advanced).

You might recall that the Stratigraphy Picker does not take into account any borehole inclination or deviation. If your boreholes are not vertical, creating this type of log+stratigraphy diagram could help you determine stratigraphic depth.

Tips on using the formation picker

Back to Pick Stratigraphy Contacts

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