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Introduction to Seismic Un*x (SU)
Mr. Kiran Khonde Seismic Data Processing (SDP) CES, C-DAC, Pune. [email protected]
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Contents
Brief history 1
Help facility 2
Working with Seismic data 3
Processing Flows with SU 4
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What is SU?
"Seismic Unix (SU)" is
An open source seismic data
processing package
Supported and developed by the Center
for Wave Phenomena (CWP) at the
Colorado School of Mines (CSM).
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Brief history
Einar Kjartansson began writing SU package in the late 1970’s.
In 1986, Shuki Ronen and Chris Liner worked on package. Chris Liner contributed to many of the graphics codes.
Craig Artley made major contributions to the graphics codes.
Dave Hale wrote several of the “heavy duty” processing codes and Ken Larner contributed many user interface ideas.
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Brief history
John Stockwell designed the "Makefile"
structure that makes the package easy to
install on the majority of Unix platforms.
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Introduction to SU
Open source package, Comes with standard
set of source codes (src) which are well
designed.
Can provide a starting base, whenever new
code needs to be written.
Many SU commands can be operated at a
time with Shell script feature of UNIX. This
feature is very useful when repeated access
of same commands is desirable (while
working with seismic traces).
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Installation Requirement
Unix/Linux platform.
Seismic Unix executable.
"make" (latest version).
ANSI C compiler.
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Processing on seismic data
Visualizing seismic data (wiggle plot and
image).
Stacking Data.
Velocity Analysis and Normal Moveout
Correction.
Dip Moveout Correction.
Seismic Migration etc.
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Conversion from segy format to su format
The SEG Y file format is one of several
standards developed by the Society of
Exploration Geophysicists for storing
geophysical data.
Internal format used by Seismic Unix
commands is called as "su".
For conversion of data from the SEGY format
to the SU format, "segyread" command is
used.
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Processing Flows with SU
Shell Script is series of command written in
plain text file.
Shell script can take input from user/file and
output them on screen. It can run many
commands.
SU flows are generated by writing commands
in shell script.
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References
Stockwell J. W. , Cohen J. K., The NewSU
User’s Manual.
Thomas Benz and Wayne D.
Pennington,1999, 2D seismic data
processing with seismic Un*x, SEG,
Expanded Abstracts, 18 , no. 1, 1493-
1495.