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UNIRAS USER GROUP 1999
Using Toolmaster/AGX in
Seismic Oil Exploration
Stuart Merrylees
ROBERTSON RESEARCH INTERNATIONAL
GEOPHYSICS DIVISION
Swanley, KENT
Email [email protected]
Tel
01322 668011
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OUR BUSINESS...
We process seismic reflection data to explore
for oil and gas.
Contracts won by competitive tender
terabytes of data
standard and proprietary algorithms
lots of computing
and lots of graphics
Develop software
2 million lines of Fortran and C….
INPUT DATA
Raw seismic signals on magnetic tape
Coordinates and maps of survey location
Well data, historic data, in any format….
Client’s objectives for this survey
Our own expertise and historic knowldege
• QC of seismic acquisition
• Interactive tools to explore data
• Hardcopy with lots of
annotation.
DELIVERABLES
QC plots of experimental diagnostics.
SEISMIC SECTIONS on paper and film
very high quality plot - complex annotation
Magnetic tape of final digital data.
CGM files on CD ROM
Written report with illustrations
various Microsoft files...
OUR TOOLS….
UNISEIS - Proprietary software
Fortran, C, X, Motif, awk, perl, xmgr
Metrica UNIX database
UNIRAS AGX and Widgets, AVS Express
C tree from FAIRCOM
PROMAX interactive seismic processing
creates CGM with SDI
favours SDI or ZEH interpreters
Geoqube matching
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OUR HARDWARE
HP
HPUX 10.20 and HPUX 11.0
PA RISC 2.0
PA RISC 2.0
PA RISC 1.0
IBM RS6000
N class (8 x PA8500)
J class, K class
735
AIX 4.3, AIX 4.2, AIX 3.2.5
F50 (4 CPU)
390, 390, 580, 530
Raid, Tapes - 3480, 3490, 3590, DLT, DAT
DISPLAY DEVICES
OYO Thermal plotters, 24/36 in 200/400 dpi
Versatec interface (CGM, or RDB metafiles).
HP 650C Design Jet Colour plotter - HPRTL
Xerox B/W paper plotter - HPRTL
LASERDOT Film plotter. 42in 800dpi raster
OCE Scanner/Film Plotter - HPRTL
Postscript printers, A3 and A4.
X terminals 1280 x 1024 resolution.
Microsoft exchange - tif and gif, etc.
WHY WE CHOSE AGX
AGX Toolmaster, Widgets and UIM/X
Purchased 1992, after comparative benchmarks.
Licenses: development and 12 run-time.
Versatile - seismic, contours, 3D, widgets.
Lots of hardcopy devices; configurable.
Authorities on CGM - committee members.
Uses UIM/X GUI builder.
Available on all our favourite UNIX platforms.
Well documented. Good UK support.
-
OUR APPLICATIONS
4 developed with UIM/X GUI builder
8 batch (or command-line) applications
3 applications written in pure X and Motif
DESIGN CRITERIA...
Write as few applications as possible !
Can it interact with, or complement, other tools ?
Interactive and batch modes of operation
How will it read ( write ? ) its data ?
Will it be fast enough ?
Hardcopy - scaling options - more annotation.
MPL Toolkit
Fortran program
Read data traces
Write to socket
TUX and AGX
C executable.
Plots traces and
starts analyses.
Write to socket
TUX and AGX
C executable.
Spectral Analysis
WHICH AGX RELEASE ?
AGX Releases…
6v5a is our current production release.
Plus some special fixes.
Some applications still need to use 6v3b or 6v4a.
7v0 - creates more portable CGM format
but new bugs (and no fixes) - not generally usable
7v1 - we were a BETA test site
we think it failed.
Research programmer
created diagnostic of 150
identical
traces, to test an
algorithm.
He saw strange effects he
did not expect.
He plotted the original
data and got a surprise...
The
original
data
Adding noise here ...
-
changes data
character here
Problem may
disappear when
you zoom ...
Can you trust
your tools ?
GRIDPLOT
Map of
velocity
of
sound over
seismic
structure in
3D survey.
One of many
slices of data
on a
rectangular
grid.
GRIDPLOT PROGRAM
Display any XY grid with various Z attributes.
Signal/Noise level in raw recordings
3D binning maps, Line intersection/Navigation QC.
Seismic velocity maps, Timeslices from 3D cube.
Define COMPACT data format:
binary data with ascii descriptor headers.
AGX GRIDS and CONTOURS
Menus to control scaling, colours, contour levels
Options to combine Z attributes, ZOOM, ROTATE
HARDCOPY - Postscript, CGM, HPTRL, etc
CGM - a picture-archive format
Extensions CGM+, CGM-PIP supported in AGX manuals but not by AGX code.
CGM allows mixed integer precision 16, 24, 32, 64 bit
Floats can be IEEE, or hybrid formats - leads to chaos.
Not complete, eg font name but no font description.
CGM is not really device independent.
Other vendor’s CGM generators and interpreters may paint
different pictures - or no picture at all !
AGX Profile system intended to correct for these deficiencies
but parameters are all trial and error.
CGM - where next ?
agX/CGM Users Guide, 6v4a, 1994.
An excellent manual and tutorial.
Oil industry (POSC) has defined reasonable subset of CGM
UNIRAS had 90% of an excellent product and has let it drift
away - has it lost interest ?
Profile keywords have new names and new parameters.
VDCTYPE (real, integer)
SEISMIC_EXTENSIONS (none, cgm_plus, cgm_pip)
MCGM_RESOLUTION ( npixel)
INTPREC_BIN (16, 24, 32)
Suggest: conform to PIP definition, with one simple keyword.
Suggest: add HERSHEY to available fonts
NEW RELEASES
New Release arrives...
Not a lot of new features in Release Notes, but…
… they never tell us what has changed....
Recompile and test all our applications
Try to debug things that fail….
Go back to original /examples/agx/ source code to try to
replicate problem.
Takes some effort - wait for response
May never succeed - no debug tools - we are stuck.
AVS Website still says 7v0 is current release ?
Maintenance experiences
SEISPLOT bugs February 1997
Robertson demonstrated problems in 6v4a/6v5a.
applications crashed; plots distorted and irregular.
fixes for 6v5a provided - but not in next release !
CGM format incompatible with other vendors.
Partly resolved by using 7v0 for CGM creation.
But it still crashes.
7v0 release had several new bugs.
7v1 release had more new bugs.
OUR WISH LIST
Provide test programs which exercise all the
features in all the AGX routines.
Always put fixes into next release.
Re-establish support for CGM.
Document UNIRAS.PRF profiles.
Update Website. Offer online documentation.
Dispense with shareable object libraries.
Support latest HP architecture and OS.
Supply UIM/X license instead of TUX license.