Data Loader: 3D Quality Checks and Troubleshooting

After loading in a 3D SEG-Y file it is a good idea to run through the following checks to ensure the line is loaded correctly.  If an error has occurred the most common examples are listed and how to troubleshoot them.

Defining Keywords

No Coordinate values in the header

• Define ONLY the Line and Trace Sequence Numbers in the Keyword file then specify the geometry.  Press the  then enter 3 known corner points for the 3D.

No Line or Trace Sequence numbers in the header

• Define ONLY the Coordinate X and Coordinate Y values in the Keyword file  Press the  button and enter the line and trace information for the file.  

No keyword information in the header

• Use both the and options.

Data Loader

• If you receive this message press  and read the error log.  You may have to revise your keywords to ensure they are correctly defined.

Basemap

Launch the Basemap (Main Launcher, Launch →  Basemap) and locate the newly loaded line.  You may need to hit the Fit Basemap to Window icon (  ) to ensure the map is in the correct location.  You may also need to use the GoTo tool (Basemap, Tools →  GoTo) to center the Basemap on the 3D.  Common errors may include:

• Basemap zoomed out too far - this may indicate missing or incorrect coordinate values.  Open Seismic Line Properties to see the X and Y values.  You may need reload the line ensuring that the Coordinate X and Y keywords are correct or that the correct scale factor has been applied.

• Line not located in the existing project area - this may indicate that the line was loaded in the incorrect Coordinate System.  Reload the line and specify the Source and Destination system on the Addition Options page of the Data Load wizard.

Line Properties

Open Seismic Line Properties (Main Launcher → Seismic → Line Properties) and find the new line on the list.  Check all of the information for the line, including the Name, Type, Version  and Min and Max X and Y.  If any of these values are incorrect you may need to delete then reload the line, adjusting the keyword file to ensure the line loads correctly.   Common errors may include:

• Max and Min X and Y values are 0- you may need to reload the line and Specify Geometry… instead of defining the Coordinate X and Y in the keyword file.

• Max and Min X and Y values are wrong by a factor of 10 - reload the line ensuring that a scale factor is given to the Coordinate X and Coordinate Y keywords.

Seismic Viewer

Open the line in the Seismic Viewer .  Look at the data to ensure that it has been loaded correctly.  Common errors may include:

• Lines appear washed out - you may need to reload the line using a statistics window.  Check the Peak to RMS ratio in Seismic Line Properties to ensure it is between 3 and 13.

• Lines appear boxy or clipped - you may need to reload the line and override the Data Format in the binary header.