Step 1: Enter your known data.
In order to use the Stratigraphy Picker program for your project, you need to have some known data from which you will interpret formations. Typically this would be downhole lithology intervals, or geophysical (elog) measurements or raster logs. See Entering the Borehole Data for details.
Step 2: Build a "Practice" Hole to Hole Section (Striplogs menu)
Once your known data is entered into the Borehole Manager tabs, you should next display the data as logs in one or more hole to hole cross sections. While this isn’t an essential step, displaying your known data can be very helpful in:
- Determining if your data is good (e.g. if the lithology or elog data are adequate to pick formations),
- Establishing the appropriate logs settings for good visualization of the data (required for good results with the Pick Contacts tool), and
- Determining the formations that you will be picking (next step).
These examples show some lithology-only logs in section on the left, and lithology + curve logs in section on the right. They were created using the Striplogs | 2D Striplog Section program.
Once you have your hole to hole section(s) displayed in a RockPlot2D window, take a good look at the logs, pick up a pencil and write down the names of the formations or units that you will be picking.
Step 3: Define Stratigraphy Types
With a good idea of the look of the existing downhole lithology or geophysical data, you need to define the Stratigraphy "Types" which includes the names of the formations, from the surface downward, that are represented in your project. When you run the Stratigraphy Picker program (next step) the program will read the current Stratigraphy Types Table and display its formations as the ones that will be picked.
! You can modify the Stratigraphy Types from within the Stratigraphy Picker program, but it's still advisable to (at minimum) rough-in your formation names beforehand.
See Stratigraphy Types Tables for details.
Step 4: Set Up the Formation Picker Display
- With your preliminary work done, select the Striplogs | Stratigraphy Picker menu option.
- Strat-Picker Options: Enter the Stratigraphy Picker Settings along the left side of the Options window.
- Set up the log display: Click on the 2D Log Design button at the top of the window, to define which available log items are to be displayed in the logs. For each item you wish to include, insert a check in its check-box, and then establish its particular settings in the pane to the right. Please refer to the Log Item Summary for more information.
If you completed Step 2, you can use the same settings as you used for your hole to hole section.
! Be sure the appropriate log items (lithology? Curves?) are turned on for your formation analysis.
Step 5: Select the Wells to be Displayed
- Click on the Section Location button at the top of the window to select which wells are to be displayed in the strat picker.
- Pick the wells:
- If you wish to discard any existing selections, click the Clear button. Otherwise, any new wells selected will be added to the existing list.
- To include a particular well in the formation picking diagram, simply position the pointer on it, and left-click the mouse. “Selected? wells will be shown as connected along a pink line representing the cross section trace.
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- Click on as many wells as you wish to include in the formation picking diagram. The well logs will be displayed in the diagram from left to right in the order you select them, first to last. Be cautioned, however, that if your project contains numerous wells, it’s best to do this in several passes. Otherwise, there may be too many logs for good viewing.
- Refer to Drawing Cross-Sections for additional details and options.
- Click on the Continue button to display the selected wells in the strat picker window.
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