Faults Loading and Display in CE8R2 and R3. David Worsick, Calgary February 25, 2009

Transcription

1 Faults Loading and Display in CE8R2 and R3 David Worsick, Calgary February 25, 2009

2 Faults Loading and Display Contents Faults in Hampson-Russell Normal Faults Strike-slip Faults Reverse Faults Thrust Faults Importing Faults Importing the Landmark Fault File Format Importing the Geoquest Charisma Format Importing Faults: Domains Importing Faults: Reading Data Managing the Fault Display Displaying Faults on Sections Displaying Faults on Maps 2

3 Faults in Hampson-Russell Faults can be loaded into Hampson-Russell software through the SeisLoader program. Once faults have been loaded into a project, you can display those faults in any section, volume or map in the other Hampson-Russell programs. 3

4 Normal Faults The software can easily handle normal faults. In these diagrams, the colors represent time or depth contours on a horizon. We expect the left part to be lower than the right because of the dip. The fault drops it even further and causes a sharp contrast. Note that normal faults are often convex in map view, as shown. 4

5 Normal Faults The left block is dropped lower. This example shows the same fault, but with the dip towards the right 5

6 Strike-slip Faults There is little vertical movement. The fault blocks slide past each other horizontally, but has only a minor local effect on time or depth contours. 6

7 Reverse Faults Reverse faults have a block moving upwards over another block. They cannot be handled as accurately because of the resulting overlap. If you must map such a fault, you should ignore the overlap as shown below. The right block has been moved higher and to the left. Note that a section of the lower block cannot be seen on the map. 7

8 Thrust Faults The overlaps are extreme. You can commonly encounter several overlapping thrust faults in one area. Thrust faults cannot be handled unless you map the horizons within every fault block as separate horizons in separate maps. In the example above, to map the top of the dark grey unit would require three separate maps, one each for the two fault slices and one for the underlying, unfaulted section. 8

9 Importing Faults Faults can only be imported through the SeisLoader program, but once they are imported, other HR programs can display them. The volume must be 3D and the file must have X-Y coordinates. 1. Select Import from File from the Fault menu of the SeisLoader window to bring up the Import Faults From Files window. 2. Find the directory for the Fault file. All fault files in that location will now be listed. 3. Select the file from the list on the left and click Add to put it into the list on the right. You can import several files at the same time. 4. Click Next. 9

10 Importing Faults 5. Select the file format : Landmark See the following slides for Geoquest (not working) more about these formats. Geoquest Charisma Free Format (not working) Unset and click Next. To see the actual data format, click the Magnifying i Glass icon next to the file. 10

11 Importing the Landmark Fault File Format Record Column Range Data Data Type X position Float, mandatory Y position Float, mandatory Z (vertical) position Float, mandatory Color Integer (1-64) Type Integer (1-normal, 2-reverse, 3-strike) P-Type Integer (segment 1-start, 2-mid, 3-end, 4-control point), mandatory Name String, mandatory Interpreter String Domain String (TIME/DEPTH) Survey String XY Unit String (meters/feet) Domain Unit String (ms/seconds for time, m/ft for depth) 11

12 Domain Unit 12 Example of a Landmark Fault File Format Non-mandatory fields should be blank if not filled. Mandatory fields are red Name P-Type Fault Type Colour Z-position Y-position X-position

13 Importing the Geoquest Charisma Format Record Data Data Type 1 X position String (length 19): not used by Hampson-Russell 2 Fault line Float: not used by Hampson-Russell 3 X position Float 4 Y position Float 5 Z (vertical) position Float 6 Name String 7 Segment ID Integer (a continuous same number indicates one segment) 8 Survey Name String 13

14 Survey Name Segment ID 14 Name Z Position Example of a Geoquest Charisma File Y Position X Position Fault Line X Position Not Used

15 Free and Unset Formats Geoquest is not available (will be released in future update) Free Format is not available (will be released in future update) This format is for reading general ASCII fault files where the information is organized in columns that are separated by specific characters (called delimiters), such as spaces or tabs, and the columns themselves may vary in width. Unset is used only to indicate that the format is unknown and therefore unavailable. 15

16 Importing Faults: Domains 6. Select the Domain used for the fault (whether PS, SS or PP time, or depth) and the units. 7. Set what the xy component units are (feet or meters). 8. Click Next. 16

17 Importing Faults: Reading Data 9. Click Start Reading Now to read in the file. A progress bar shows the process. When a pick in the fault file cannot be read or used, it will be counted in the Rejected column. When a fault pick has been successfully loaded, it will be counted in the Inserted column. 17

18 Importing Faults: Summary Page The results will be displayed, showing how many data points were successfully read. 10. When the program has finished reading the files, the OK button becomes active. Click it to import the files into your project. 18

19 Managing the Fault Display To set which of the imported faults are displayed, their colors and other aspects, select Fault List from the Fault menu in SeisLoader. Use the Name Filter to list only faults with specific names Use this icon to display the fault segments in Notepad Select this to always display a fault This shows manually picked segments 19

20 Displaying Faults on Sections 1. To set the display parameters for faults on volume sections, open the Seismic View Parameter window and select the Fault tab. 2. Any available faults would be displayed on the Available Faults list. Use Add or Add All to move these to the Selected Faults list. Fault 1 Fault 2 Fault 4 Fault Set whether to show fault names, and where. 4. Set the fault thickness (in pixels) and whether the fault trace is outlined. 5. If you want the name to show clearly, hiding traces behind it, then do not select a Transparent background. 6. Click OK. 20

21 Displaying Faults on Maps To set the display parameters for faults on maps, use the View menu. Select whether to show the fault trace on the horizon being mapped and whether to show the top of the fault plane (see below). Select whether to show the fault names. 21

22 Known Issues with Fault Handling 1. We can only import faults defined in X-Y format using a 3D geometry 2. We can only import faults in Landmark or Geoquest Charisma ASCII format 3. Once faults care loaded d in to SeisLoader there is no direct way within the software to delete them from the project. 4. We have found that the software and menus can be unstable when more than 20 faults are loaded/displayed. 5. When the project is opened by a program other than SeisLoader the display selections for the faults are not honored. Basically you get all faults within the project. 22