ascii2segy/README.md

usage: ascii2segy_segpy.py [-h] [-o OUTFILE] [-s SAMPLE_RATE] [-m MAX_TIME] [--dtype DTYPE] [-d SEISMIC_DIMENSIONS] [-e] [-v VERBOSITY] [-t] infile

ascii2segy

This script uses segpy-rewrite to convert velf ascii files to segy files. Please use 64 bit python for large files as data is loaded into memory.

Run with -h to get more information on parameters.

Outputs

A segy file containing the velocities from the input ascii file.

Inputs

Example input file format:

############################################################################### #BEGIN HEADER #X #Y #Z (time) #FLOAT "Stacking Velocity" #FLOAT "XLINE" #FLOAT "INLINE" #END HEADER 7618446.0 141544.0 0.0 1510.0 10040.0 2060
7618446.0 141544.0 40.0 1510.0 10040.0 2060 7618446.0 141544.0 80.0 1510.0 10040.0 2060

Examples

ascii2segy.py test.csv -o test.sgy ascii2segy.py -h ascii2segy.py test.csv -s 40 -m 5000 -c 15 -n 4 -d 2 -v 3 -e 1

Installation

Make sure you have 64bit python 3.3 installation Install the requirements listed in requirements.txt. Note that this uses segpy 2.0.0a2 from github.com/rob-smallshire/segpy which you can install using the command below:

pip install git+git://github.com/sixty-north/segpy/tree/91562fddfd6d8424ee4161f4417982243512c150

In a command propmt with python64 3.3 install and test:

pip install -r requirements.txt
python ascii2segy ./test_data/test_input.tsv

License

This inherits it's license from segpy

More Info

Created on Mon Aug 04 09:11:11 2014

positional arguments: infile Input ascii velovity file in western (velf) format.

optional arguments: -h, --help show this help message and exit -o OUTFILE, --outfile OUTFILE Optional output segy filename, e.g. outfile.sgy. Defaults to infile.sgy. (default: None) -s SAMPLE_RATE, --sample-rate SAMPLE_RATE If not provided this is autodetected from input data. The velocities are resampled to this rate in milliseconds. (default: None) -m MAX_TIME, --max-time MAX_TIME If not provided this is autodetected from input data. The maximum time of the segy in ms. (default: None) --dtype DTYPE Datatype for segy {8: 'int8', 1: 'ibm', 2: 'int32', 3: 'int16', 5: 'float32'} -d SEISMIC_DIMENSIONS, --seismic-dimensions SEISMIC_DIMENSIONS Type of seismic, options 2 or 3. (default: 3) -e, --use-extended-header Use the segy extended header in the output, this will contain the header from the text file. Defaults to false. (default: False) -v VERBOSITY, --verbosity VERBOSITY Print more information, can be 0, 1, or 2. (default: 0) -t, --test Run sanity tests. (default: False) To exit: use 'exit', 'quit', or Ctrl-D. An exception has occurred, use %tb to see the full traceback.