g-Space writes seismic data back to disk in the SEG-Y format (.sgy / .segy). This topic covers exporting post-stack volumes, 2D lines, arbitrary-line sections and velocity models from a project as standard SEG-Y files.

Purpose

Export seismic amplitude, attribute or velocity data so it can be exchanged with other software or archived. Export is one-directional: the loaded data is written to a new SEG-Y file together with its trace headers and a textual (EBCDIC) header, leaving the project data unchanged.

The following export variants are available, depending on the selected object:

• Post-stack 3D volumes and 2D lines, as loaded.
• Time-to-depth converted volumes and lines (Export time to depth).
• Shifted volumes and lines that carry the applied static / bulk shifts (Export with all shifts).
• Arbitrary-line sections extracted along a user-drawn path.
• Velocity models.

Launching the export

In the Data Manager, right-click the seismic object you want to export (a loaded volume, 2D line, arbitrary line or velocity model) and choose the matching export command from the context menu.

For a plain volume or line the context menu offers commands such as Export time to depth, Export with all shifts and the batch variants Export all time lines with shifts / Export all time volumes with shifts. An arbitrary line offers Export arbitrary line. Seismic export commands are also reachable from the seismic ribbon while a seismic object is active.

[image: placeholder_Data_Manager_context_menu_on_a_seismic_v.png]

Step-by-step

1. In the Data Manager, right-click the seismic object and pick the required export command.
2. In the file dialog choose the output folder and file name. The file filter offers .sgy and .segy.
3. Set the Trace header formats template that controls the binary / trace-header byte layout written to the file.
4. Set the writing options: Saving mode (append or direct), Rewrite file, Convert to feet and Save text header to separate file as needed.
5. For a shift or depth export, confirm the datum / conversion parameters; the traces are corrected to the project datum before being written.
6. Run the export. g-Space writes the traces to the SEG-Y file and reports the Number of traces written on completion.

[image: placeholder_SEG-Y_save_dialog_with_trace_header_form.png]

Parameters and notes

• Sample format — samples are written as 4-byte floating point, either IBM float or IEEE float, according to the chosen trace-header format.
• Text (EBCDIC) header — a textual header is written with the file; it can optionally be saved to a separate .txt / .csv / .ebcdic file.
• Scalars — coordinate, elevation and shot-point scalar values control how header coordinates are encoded.
• Domain — both time and depth data can be exported; use Export time to depth to write a converted depth volume from a loaded time volume.
• Shifts — the with all shifts variants bake the applied static and bulk shifts into the exported traces.
• Arbitrary-line export writes the extracted section to a single SEG-Y file after correcting the traces to the output datum.

See Also

Seismic Data Formats | Import seismic | Export seismic to GeoTIFF