This TIPS&TRICKS is intended to aid a person working in Petrel who needs to make a display showing the relative proportion of different areas of a dataset. Each pie represents the size relationship between the parts of an object and the entire object.
This article was created using Petrel 2011.2 and a sample pie chart (in a Map window) using the Gulfaks dataset is shown below. Those of you using Petrel 2010 will find the workflow and windows to be very similar (and in many places, identical) to what is shown here.
Pie Charts in Petrel For this article, we will only discuss pie charts using data found in the Input tab; and not the bubble maps that can be created using summary data from Simulator runs.
Pie charts may only be displayed in Map, Interpretation and Intersection windows (along with Map and Intersection viewports on a Plot window). Data used to create the pie charts comes from either a Well Tops object or a Pointset object with attributes.
Using a Pointset with Attributes A Pointset with attributes might look like (in the Input tab with a 3D Window active):
Note the radio buttons between the icons and the attribute names. This indicates that only one attribute can be displayed in the active window. When a Map window is the active window, the same Pointset would look like:
Now, the radio buttons have been replaced with boxes indicating that multiple attributes can be displayed in the active window. When the Settings Style tab for the dataset is displayed, it might appear with the Symbol radio button active. If all the attributes for the pie chart are set active in the Pointset, it still appears without any bubbles on the map window:
How are these Pointsets with attributes created? There are two main ways to create them; importing the data including the attributes and having a previously created pointset and adding the attributes.
Import the data including the attributes from an ASCII file. There are two sub‐options here; importing a file with headers and importing a file with no headers.
Importing a file with Headers A file with Petrel headers is shown below:
If you are lucky enough to have a file with headers, importing it is very easy.
1. Right‐click on the folder where you want to import the file and choose Import (on selection)
a) Navigate to the folder where the data is stored, click on the file (it appears in the File name: box and click Open.
b) The Import Petrel points with attributes window appears. The top of the window contains the attributes that Petrel has read from the file with headers.
The bottom of the window contains the first few lines of the file:
c) Make the window large enough so you can scroll through the window and confirm that the attributes at the top of the window actually match the data at the bottom of the window. When satisfied, click on the OK or OK for all button.
d) Another window appears allowing you to set the template and Coordinate Reference System (CRS) of the dataset. Again, click OK or OK for all.
e) The data is imported into the Input tab.
2. You will probably need to open the Settings for some of the attributes and change their templates.
3. Once the data is imported, display it in a window.
Importing a file without Headers If you have a data file without headers, you must assign the attributes yourself. A file without headers might look like:
1. Begin the same way as earlier. Right‐click on the folder where the data will be stored and choose Import (on selection) …
a. Navigate to the folder where the data is stored, click on the file (it appears in the File name: box and click Open.
b. The Import Petrel points with attributes window appears. The top of the window contains some attributes but they probably don’t match the data that appears at the bottom of the window. The attributes at the top:
c. The data at the bottom:
d. Manually, make the attributes match the data by adding attributes using the Append a column in
the table icon or deleting attributes using the Delete a column in the table icon. Change the Attribute type and name until the data matches. The following attributes at the top now match the data.
e. When the attributes match, click on the OK or OK for all button.
f. Another window appears allowing you to set the template and CRS of the dataset. Click OK or OK for all.
g. The data is imported into the Input tab.
2. Once again, you will probably need to open the Settings for some of the attributes and change their templates.
3. Once the data is imported, display it in a window.
Adding Attributes to a Pointset If you have a previously existing Pointset and need to add attributes, you must have properties already defined in a 3D Grid:
7. The new attribute is created under the Pointset.
8. Repeat for the other attributes, selecting the corresponding properties:
9. Use the data to build the pie charts.
Using Well Tops When using Well Tops, you must have already defined Zone attributes or structural attributes other than the “Z” attribute (often Depth).
Open a map window and display a Well Tops object. Open the Settings for the Well Tops and make sure the Pie chart radio button on the Style tab is checked.
3. When the Settings for the new continuous attribute appears, go to the Attribute Operations tab
4. If you are creating a Zone attribute, check the radio button in front of To the zones at level and enter the zone level (usually either 1 or 2).
5. If the attribute is to be generated from a log, check the radio button in front of Well logs, pick the log to be used and change the other parameters (usually Average method at least) and click the Run button.
6. If the attribute is to be generated from a surface, check the radio button in front of Surface, highlight, in the Input tab, the surface to use and use the blue arrow to enter it into the Settings. Then, click the Run button.
7. Whichever method you choose, the attribute is added to the bottom of the Attributes folder under the Well Tops.
8. If it is a zone attribute, consider changing the name to include the word “Zone” to make sure this is clear in the future.
9. If you are adding an attribute to the surfaces, use the same methods described above. Adding the word “Zone” to zone attributes helps eliminate confusion. Another method of adding structural attributes is to use the Well Tops Calculator.
10. Add all zones necessary for the pie charts using one of the above methods.
The zone attributes can be seen by right‐clicking on the well tops and choosing View Zone Spreadsheet.
If the pie bubbles don’t display correctly, ensure the Settings for the Well Tops have the Pie chart radio button checked on the Style tab. Change colors for the attributes as necessary.
Structural attributes may also be used for the pie charts.
See the structural attribute values by right‐clicking on the well tops and choosing Spreadsheet
Intersection Windows Intersection windows work similarly. Once the attributes have been generated, open an Intersection window and select the intersection for the location. Go to the Settings Style for the data and check the Pie chart radio button.
Interpretation Windows Pie charts can also be seen in Interpretation windows. Open an Interpretation window, set its location and go to Settings Style of the well tops object. Click the Pie chart radio button and the bubbles will appear in the active Interpretation window.
