Exporting to SEG-Y

You can export a 2D or 3D volume to the SEG-Y format so that it can be used in other applications.

If a velocity volume is configured for the session (see Converting Time-Depth), the data can be exported in time or depth.

Note: You can also export volume in the flattened domain to SEG-Y.

See Edit SEGY Header  for more configuration options.

Export to other formats:

Selecting the SEG-Y format

Export a 3D volume to SEG-Y
  1. Go to Control Panel > Volume tab.
  2. Right-click the volume and click Export "volume_name".
  3. Export Volume window will be displayed.
  4. At Format, select SEG-Y.
  5. Click Edit SEG-Y Header to open the SEG-Y Text header editor (optional).
  6. Select an output option:
    • Don't split (default): Export as a single SEG-Y file.
    • Split by file size: Export to multiple files, each with a maximum size (according to the setting Max File Size GiB)
    • Split by inlines (3D only): Export to multiple files, containing a range of inlines (according to Inlines per file setting)
  7. At File, click the blue folder icon to set the output file name.

Export multiple volume settings

When multiple volumes are selected for export, additional options are shown:

  • When the volumes have different extents, Insight exports the full extents of each volume. You cannot change the extents in this case.
  • When the volumes have matching extents, you can change the extents for the export.

Embedded Horizon Export

Horizon data, such as water depths, can be stored in trace headers as the data is exported.

Export a 3D volume to SEG-Y
  1. Click the blue "+" icon to add horizon data.
    • This option is only available if you have horizons loaded in the session.
    • Click the red "x" icon to remove.
  2. Select the Horizon.
  3. Select the Attribute (property).
    • Adjust the multiplier if a scale should be applied for data in this header
  4. Select the trace Header to store the horizon value.
  5. Tick Zero if Missing to use zero for traces with no corresponding horizon value.
    • If unchecked, the export will stop with an error when traces cannot find a horizon value.

Vertical Extents

  1. Deselected Override will use the extents of the existing volume or line.
  2. Check the Override box to change the vertical extents of the export volume.
  3. Select the time or depth domain.
    • If time-depth conversion is configured, time/depth conversion can be performed while exporting.
  4. Define the vertical extent and its increment.
  5. For 2D volumes, click this dropdown to see the vertical extents of each line.
  6. Select the Vertical Interpolation method:
    • Sinc: for seismic data.
    • Edge Detecting: for blocky data, such as impedance volumes.
    • Lagrangian: for smoothly varying data, but not velocities.
    • Linear: Simple linear. Use for ZT and TZ velocity volumes.
    • Nearest: for integer volumes, such as "most likely LID".

3D Volume

Survey Extents

  1. Click the Survey selector.
  2. Select the survey for the exported volume.
    • Volumes can be exported to 3D surveys or along 2D lines/2D line-sets.

Horizontal Extents

Define the IL and CL range to export.

  • For both 2D and 3D, the extent settings default to native extents and sample rates.
  • If you change the extents or increments, samples will be interpolated (but not extrapolated) as necessary.

2D Volume

Line Sets

  1. At Line Set, select a line set to constrain the export (see Creating a 2D Line Set).
  2. Under the Line column, toggle the traffic light to select (green) or deselect (amber) which 2D line to export.
    • By default, all lines are selected.
  3. Click the Set Spacing button to define the CMP Extents.
    • Select Distance or CMP increment.
    • Set the increment value.
    • The increment of the listed lines will update automatically based on values configured.

Note: By default, both 2D and 3D volume is exported at its native extents and sample rates in all dimensions. If the extents or increments is changed, missing samples will be interpolated (but not extrapolated) as necessary.

Constrain to horizontal area

  1. Constrain horizontal area: select a polygon/probe to constrain the volume export to the area covered by the polygon/probe (see Creating a Polygon in Map View and Creating a Probe).
  2. Set ensemble X/Y from Survey: Set the trace ensemble X/Y headers with X/Y values from the survey.
    Only uncheck this if all the following are true:
    • The ensemble X/Y headers contain values from the initial import
    • These coordinates are different to those used by Insight
    • You do not want to set the coordinates to match Insight’s positioning
  3. Override coordinate scalar: define a different volume-wide scalar in the adjacent box.
    • Applied to coordinate trace headers
    • Value must be between -100 and 100 (inclusive)
  4. Override elevation scalar: override the scalar of each individual trace.
    • Applied to elevation trace headers
    • Value must be between -1000 and 1000 (inclusive)
  5. Drop all-NaN traces: exclude NaNs when exporting.

Performance

  1. Adjust the Performance slider to set the resources use for exporting.
    • This slider controls the number of CPU cores to use. It indirectly affects the amount of memory required -- particularly for processes that require a lot of memory to calculate (such as Volume Smoothing).
    • Note: If you get "Out of Memory" errors when exporting, try reducing this slider.
  2. Set the Export priority
    • Adjust this value to control the sequence when exporting many volumes.
    • Insight exports multiple volumes in order of priority.
    • Highest priority exports are done first.

Click OK to begin exporting. An export indication will be displayed beside the volume name.

Starting and Stopping an export

After the export starts, the progress is shown in the details panel for the volume.

  1. Select the Volume in the Control Panel.
  2. The progress indicator is shown in the details panel.
  3. Click the red x icon to cancel the export.

Note: Insight writes the X/Y values from the survey file to the ENSEMBLE X (cdpx) / ENSEMBLE Y (cdpy) headers at bytes 181 and 185, respectively. When writing, the export will honour the navigation scalar (scalco) on the trace, as seen in the View menu under Headers.

Volumes in use

Cannot overwrite the same file during export

Insight will not allow you overwrite the original data or overwrite a volume that is in use.

To continue exporting, select another file to export the volume.