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Trace padding#

Pad traces in SEG-Y file(s) to correct DelayRecordingTime.

Description#

Check for vertical offsets in SEG-Y file(s) using trace header keyword DelayRecordingTime (delrt) and pad seismic trace with zeros to compensate variable recording starting times.

  1. Detect changing DelayRecordingTime based on trace header values
  2. Split input profile into multiple segments of different derlt
  3. Pad start (top) and end (bottom) of traces per segment to minimum and maximum delrt (using zeros)
  4. Write padded data to new SEG-Y file(s)

Trace padding

Figure: Schemetic showing trace padding effect.

Usage#

This script is designed to be used from the terminal (i.e. command line).

Command line interface#

The script can handle three different inputs:

  1. single SEG-Y file (e.g., filename.sgy)
  2. datalist of files to process (e.g., datalist.txt)
  3. directory with input files (e.g., /input_dir)

There are two options to run the script. We recommend using the CLI entry point like:

>>> 04_pad_delrt {filename.sgy | datalist.txt | </directory>} [optional parameters]

Alternatively, the script can be executed using the (more verbose) command:

>>> python -m pseudo_3D_interpolation.delrt_padding_segy {filename.sgy | datalist.txt | </directory>} [optional parameters]

Optionally, the following parameters can be specified:

  • --help, -h: Show help.
  • --output_dir {DIR}: Output directory (either --inplace or --output_dir are required!).
  • --suffix {sgy}: File suffix (default: sgy). Only used if directory is specified.
  • --filename_suffix {SUFFIX}: Filename suffix (e.g. pad, static) to filter input files. Only used if directory is specified.
  • --txt_suffix {despk}: Suffix to append to output filename (default: despk).
  • --byte_delay {109}: Byte position of input delay times in SEG-Y file(s) (default: 109).
  • --verbose {LEVEL}: Level of output verbosity (default: 0).

NOTE: Since the total number of traces per file changes, the files cannot be updated inplace!

Last update: Monday, 03 July 2023 at 09:46:51