Import other seismic formats

In addition to SEG-Y, ZGY and GSD, g-Space can read several other seismic formats. Most of them are field / raw formats that are converted to SEG-Y on import: SEG-D, SEG-2, SEG-B (SN338 / SN339), MiniSEED and Seismic Unix (SU). All of them are import only. This topic covers the shared import workflow.

Purpose

Bring seismic stored in vendor / field formats into a g-Space project. These are mostly pre-stack field or shot gathers and single-trace collections; on import they are converted to SEG-Y (or read into a gather), after which they are loaded like any other SEG-Y volume. The supported formats and the objects they carry are:

SEG-D (.sgd, .segd, .sd, .hd) - pre-stack field / shot gathers. Converted to SEG-Y (Convert SEG-D to SEG-Y).
SEG-2 (.dat, .seg2, .sg2) - pre-stack field / shot gathers. Converted to SEG-Y (Convert SEG2 to SEG-Y).
SEG-B (.segb), including the SN338 and SN339 variants - pre-stack field / shot gathers. Converted to SEG-Y (Convert SEG-B to SEG-Y).
MiniSEED - traces / gathers. Read into a gather (Read MiniSeed).
Seismic Unix (.su) - traces / gathers. Read into a gather (Load SU).

Launching the import

Each format has its own reader / converter procedure in the seismic data procedures. Start the procedure that matches your data - for example Convert SEG-D to SEG-Y, Convert SEG2 to SEG-Y, Convert SEG-B to SEG-Y, Read MiniSeed or Load SU.

[image: placeholder_The_seismic_data_procedures_list_with_th.png]

Step-by-step

The SEG-D / SEG-2 / SEG-B converters share the same steps; MiniSEED and SU read a single file into a gather.

In the converter, add the field files to the Input files list, using the file filter that matches the format's extensions.
Run Read headers to scan the files. The Common Information and Traces information tables preview the geometry and trace headers detected in each file.
Set the Output file: file type SEG-Y, the output file name, and the Trace header format. Set any format-specific options - for SEG-B pick the File format (SEG-B or SN339); for SEG-D pick the SEG-D version.
Execute the procedure. The field files are written into a single SEG-Y (MiniSEED and SU are read straight into a gather instead).
Load the resulting SEG-Y into the project through the seismic files view - Add files - the same way you load any other SEG-Y.

[image: placeholder_A_SEG_format_to_SEG-Y_converter_showing_.png]

Notes

Importing pre-stack gathers (SEG-D, SEG-2, SEG-B and pre-stack SU / MiniSEED data) requires the GEOPHYSICAL_INTERPRETATION license; without it the pre-stack option is not available.
These formats are import only. Once data is in the project it is stored and re-exported as SEG-Y.
The SEG-B reader supports the SN338 / SN339 variants and exposes an Advanced header-size option; the SU reader adds options such as trace-header read mode, offset recalculation and data datum.