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Import SEG-Y files

This exercise will guide you through import of a seismic line. It will cover the simple case for a plain SEG-Y file which follows the SEG-Y standard and has navigation stored in the trace header. In the example we will use the SEG-Y file which is stored with the Atlantis project.

A SEG-Y file can only be imported into a seismic data folder. If you are using Geocap's standard UNCLOS folder structure then such a folder is located in 3. Sediment Data/Seismic Data In this exercise we will also generate a sub-folder in order to organize our data.

1. Locate the folder 3. Sediment Data/Seismic Data in your project
2. Right click the folder and select New > Folder
3. Right click the folder and select Rename. Give the folder the name of the survey. In this case ATL-LOS-00 (or give it another name if you are importing into the Atlantis project and the folder already exists)
4. Right click the folder and select Import > SEG-Y 2D. The SEG-Y import menu will appear.
5. Click the Defaults button in order to reset the menu to the default options.
6. Click the file browse button and select the ATL-LOS-00-1.segy-file located in the Atlantis folder structure on disk (Projects/Atlantis_2_1/Data/Sediment data/Atl-los-1-segy).
7. Click Open. The file follows the SEG-Y standard and we do not have to change the default settings.
8. It might be a good idea to check that the Storage: in the lower right corner is set to 8 bit.
9. Click Execute
10. You will be prompted with a dialog asking you for datum and projection for the seismic line. Select WGS 84 and Mercator and click OK
11. Click OK again
12. Click OK in order to close the SEG-Y import command.

Interpret a seismic line

In this exercise we are going to interpret the seabed and basement of the seismic line. First we need to display the seismic line we want to interpret.

1. Right click the seismic line and select Seismic display.
2. Right click the seismic line and select Zoom to Data

Next we open the Seismic Interpretation (Xi) dialog:

• Locate Seismic Interpretation under Tools in the main menu.

First we need to select where our interpretations should be stored:

1. Click Browse button to select the interpretation folder
2. Select the seismic interpretation folder 3.Sediment Data / Seismic Interpretations

Next we need to specify the horizons we want to interpret:

1. Click the button in order to create a new IHorizon. The IHorizon dialog will appear
2. Type in Seafloor as the name of the new horizon, and click OK
3. Click the Graphical Settings tab
4. Set Line Width to 5
5. Check the User Defined Color and pick a color for the horizon.
6. Click OK
7. Click the same new button again, and call the next horizon Sediment Base.