Defining a Survey (3D SEG-Y)

A survey defines where the volume sits on the earth. It also shows details including the inline/crossline spacing. The Survey window allows you to use the analysis results to create a new survey or to merge the results to another survey.

Define a survey file

Define a survey file
  • Create new survey called — Select this option to create a new survey, and type a name for the new survey. Insight will add the new survey to the project database automatically.
  • Use existing survey — Select this option to use an existing survey for the data loading, and click on the arrow to display the list of existing surveys to choose from. This option is enabled if there is any existing survey in the project database.
  • Replace existing survey — Select this option to overwrite an existing survey, and select the survey which will be overwritten from the drop-down list. This option is enabled if there is any existing survey in the project database.
  • Notes — Type a short comment about the survey if you are creating a new survey or overwriting an existing survey. By default, it contains some auto-generated text.

If you have chosen to manually enter the IL/CL to X/Y tie points, type three tie points in the IL/CL to X/Y Tie Points pane. You can look for the appropriate information from the EBCDIC Header.

If you have earlier selected the option to calculate tie points from X/Y headers, you will see the tie-points that have been automatically calculated by the SEG-Y Loader. You can change the values of the tie points by typing the values in the Inline, Crossline, X and Y columns. Click Reset tie points from analysis to reset the values to the automatically calculated tie points from the analysis or remove the values you have entered (if you are manually entering the tie points).

The IL spacing, CL spacing, IL orientation (survey azimuth) and Angle between ILs and CLs are calculated based on the tie points. A warning will be displayed if the angle between ILs and CLs is not exactly perpendicular.

Once all the required information have been entered, click Next.

For examples, see Survey File Examples.

Note: A survey defines the relationship between Inline/Crossline and Eastings/Northings (based on the tie-points). If Insight detects that the tie-points have the same relationship between IL/CL and X/Y as another survey in the project database, it will NOT allow you to create a new survey as it is considered a duplicate (see Why does SEG-Y Loader tell me I have a duplicate survey even though the coordinates are not the same?).

Genuine offer of assistance

DUG understands that importing SEG-Y data can be a confusing task.

Whether you are using a trial version or a fully-paid licence, we will help you to import your data to Insight so that you will get the maximum out of your data.

For more information, contact support at