OpendTect User Documentation version 3.2
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4.4. Export

4.4.1. Seismics

The export seismics module is used to export 2D/3D seismic data as SEGY and/or as simple File.

4.4.1.1. SEG-Y - Seismic data access window

Select an input file and specify the parameter and byte locations of the output file in the SEG-Y - Seismic access definition window described below. The various output settings depend on whether you are exporting 2D or 3D data.

4.4.1.1.1. 2D export options




Input line set. First, select from which lineset you wish to export something.

Line name. Allows you to export a single 2D line only. Not selecting any line will export the complete Line Set.

Trace subselection. Indicate whether you want to export a certain number of traces, or Z range only.

Scale values. The data can be scaled before output, and null traces can be left in the volume (Pass) or discarded. The output will be calculated with:

output = Factor * input + Shift

Null traces. Null traces can be discarded or left inside the line (Pass.)

Export more, similar files. Pops up a new window with settings for exporting multiple 2D lines in one go.



Select the Lines to export from the list. Each SEGY file will be saved with the name provided in the Output field. Just as in the Importing of multiple 2D lines, the #L represents a string. In this case the #L will be replaced by the Line name as it is known in OpendTect, i.e. as you see it in this list.

The SEGY parameter setup for each exported Line is stored in a parameter file as indicated in the Store each setup as field. iAgain, the #L is a string, representing the OpendTect line name.

4.4.1.1.2. 3D export options

Select. All data or a Sub-volume can be output to a file.

Scale values. The data can be scaled before output, and null traces can be left in the volume (Pass) or discarded. The output will be calculated with:

output = Factor * input + Shift

Null traces. Null traces can be discarded or left inside the line (Pass.)

4.4.1.2. SEGY - Seismic access definition window

The SEG-Y definition options depend on whether you are exporting 2D or 3D data. The top of the window is the same in both cases: Specify a SEGY definition name. This is the name under which this SEGY file and its access will be known in OpendTect. Specify the physical filename and full path of the output SEGY file.

4.4.1.2.1. 2D export options

Specify the byte positions in which you want to store the trace number (and the byte size), the X and Y coordinate, and the segy data format.

4.4.1.2.2. 3D export options

Specify the byte positions in which you want to store inline, crossline, X-coordinate, and Y-coordinate. For inline and crossline, also specify whether the values should be stored in the trace header in 2-bytes or 4-bytes.

4.4.1.3. Simple File

This particular export option is included in OpendTect as a plugin. In OpendTect, you can also export a simple seismic ASCII or Binary file from
Survey: > Export > Seismic > Simple File > 2D/3D or Prestack etc.

The export window has been divided into two parts:

The upper part defines the settings of the seismic to be exported. Browse the desired cube/Lineset to be exported. Select the desired range of volume/line. If you want to apply scaling while exporting, check the scale values and write the amount shift with appropriate factor. Discard or pass the null traces.

The lower part defines the layout of the output file. So, you can either write the trace positions (XY or Inline/Xline) in the output file or without the trace information. Same is the case for sampling file.

Mention the file type ASCII or Binary and output file name/location.



Simple 3D Seismic File Export Window


Simple 2D Seismic File Export Window

4.4.2. Horizons



The export horizons module is used to export horizons and/or associated attributes to ASCII files. A horizon needs to stored on disc (right-click on the horizon in the tree) before it can be exported.

In the Calculated attributes field, you can select what attribute will be exported. To de-select an attribute, right-click on it. You can make a sub selection of the Available patches. Each patch will be stored in a different file. with extensions in the shape of ^1, ^2, etc.

Three types of ascii files are supported.
The ASCII file is TAB delimited.

4.4.3. Faults



The available format for exporting faults is ascii. The following window pops up when this format is selected:



In this window, it is possible to specify the output format. First, select the input fault to be exported. Then, select the way the coordinates will be written: x/y or Inl/Crl. User can also choose the option to write a stick index or a node index or to choose none of these two options.

Finally, choose a name for the Output Ascii file.

4.4.4. Picksets



The export pickset module is used to export picksets. One can think of outlines of structures, picked faults, etc.
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