Transcript Document

SEGD Rev. 3.0
Positioning Subcommittee
Barry D. Barrs
ExxonMobil
September 21, 2007
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Overview
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Post OGP – S&P Meeting
– Summary of Meetings - 5/1 & 5/21
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Post EAGE Meeting
– Summary of Meeting - 7/25
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Positioning Working Group
– Summary of Meetings - 8/1 & 9/5
Current Accomplishments
 Next Steps
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September 21, 2007
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Post OGP – S&P Meeting
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Meeting Attendees – May 1
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Barry Barrs – ExxonMobil - Chair
Bob Firth – Troika
Stewart Levin – Halliburton
Geir Simensen – Statoil
Jan Eikelboom – Shell
September 21, 2007
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Post OGP – S&P Meeting
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Meeting Attendees – May 21
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Barry Barrs – ExxonMobil - Chair
Rune Haglund – WesternGeco
Stewart Levin – Halliburton
Jan Eikelboom – Shell
John Conner - EnSoCo
September 21, 2007
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Post OGP – S&P Meeting
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Summary of Meetings
– Much discussion concerning what type
of positioning data is needed in SEGD
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Planned Positions
As-shot
Measured
Source/Receiver
– Sercel has a proprietary format that
captures this type of information
September 21, 2007
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Post OGP – S&P Meeting
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Summary of Meetings
– Concern that multiple position types
might lead to wrong positioning data
being used
– Proper tagging of the different types
could be used as well as time stamps to
help with this problem
September 21, 2007
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Post OGP – S&P Meeting
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Summary of Meetings
– UKOOA P1/90 in SEGD General Header
– UKOOA P2/94 in SEGD General Trailer
– No intention of the positioning data in
SEGD to replace UKOOA P1, P2, or SPS
– Ancillary Data Standard (ADS) Format
• ADS provides a means of capturing during
acquisition and in one file all ancillary data
pertaining to a 3D geophysical survey
September 21, 2007
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Post OGP – S&P Meeting
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Summary of Meetings
– (ADS) Format
• Any data could be recorded and transferred
in a standardized way
• P1/90 and P2/94 files could be treated as
chunks when incorporated into a metafile
• So why is ADS format not used more?
• Some felt it was to complex and that is the
reason it is not used more
September 21, 2007
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Post OGP – S&P Meeting
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Summary of Meetings
– (ADS) Format
• Also the ADS format does not allow for the
seismic to be stored
• Could the ADS format be embedded into the
SEGD? Our understanding is no
– We need feedback from industry
processors on what positioning they
would like to have
September 21, 2007
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Post EAGE Meeting
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Meeting Attendees – July 25
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Barry Barrs – ExxonMobil - Chair
Jill Lewis – Troika
Bob Firth – Troika
Chris Frew - Troika
Stewart Levin – Halliburton
Geir Simensen – Statoil
Jan Eikelboom – Shell
John Conner - EnSoCo
September 21, 2007
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Post EAGE Meeting
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Summary of Meeting
– Update on EAGE meeting provided by
Stewart and Jill
– From last meeting – What does
Processing want to see
– Final Positioning data captured in a
manner to help streamline the
processing
September 21, 2007
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Post EAGE Meeting
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Summary of Meeting
– SEGD3 is intended as a write once
format as close to real-time as possible
– The coordinate data is the best
approximation at the recording epoch
– Automating the ability to populate the
SEGY format
September 21, 2007
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Post EAGE Meeting
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Summary of Meeting
– One suggestion for automating was to
look at App. D of SEGY1 for defining the
coordinate data
– Smaller Working Group of positioning
experts formed to investigate modifying
App. D of SEGY1 for SEGD3 use
– Decision made to just work SEGD3 for
now and address UKOOA formats later
September 21, 2007
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Positioning Working Group
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Meeting Attendees – August 1
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Barry Barrs – ExxonMobil
John Conner – EnSoCo
Roger Lott – Retired BP
Victor Ramirez – CGGVeritas
Jim Cain – Cain & Barnes
September 21, 2007
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Positioning Working Group
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Meeting Attendees – September 5
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Barry Barrs – ExxonMobil
Geir Simensen – Statoil
John Conner – EnSoCo
Victor Ramirez – CGGVeritas
Jim Cain – Cain & Barnes
September 21, 2007
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Positioning Working Group
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Summary of Meetings
– Working group feels App. D is perfect
for defining the coordinate data
– We need to define precision of the
coordinates
– Need the ability to define the CRS both
implicitly and explicitly
September 21, 2007
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Positioning Working Group
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Summary of Meetings
– Vertical Component in App. D not well
defined
– Transformation Stanza needs to be
added
– Maybe a stanza that addresses
Engineering/Township-Range systems
September 21, 2007
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Positioning Working Group
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Summary of Meetings
– Any changes made to App. D for SEGD3
use should be considered also for
SEGY1
– Both Easting / Northing and Latitude /
Longitude coordinates should be
included for all points in SEGD3
– If not both, then a test point example
should be included
September 21, 2007
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Positioning Working Group
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Summary of Meetings
– Add more examples beyond the ones
provided for in SEGY1
– Some concern about backward
compatibility with existing SEGY1
– For SEGD3 use delete section D2, D3,
D5, D6 and D7
September 21, 2007
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Current Accomplishments
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See Current Appendix “X” for SEGD3
September 21, 2007
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Next Steps
Working Group to review changes /
modifications to date
 Incorporate recent discussions with
Stewart Levin on precision in the
new Appendix
 Determine what coordinates need to
be captured in General Header
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September 21, 2007
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Next Steps
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Have a follow-up Meeting with full
Positioning Subcommittee to review
all recommendations
September 21, 2007
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