September 21, 20071 SEGD Rev. 3.0 Positioning Subcommittee Barry D. Barrs ExxonMobil.
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Transcript of September 21, 20071 SEGD Rev. 3.0 Positioning Subcommittee Barry D. Barrs ExxonMobil.
September 21, 2007 1
SEGD Rev. 3.0 SEGD Rev. 3.0 Positioning SubcommitteePositioning Subcommittee
Barry D. Barrs
ExxonMobil
September 21, 2007 2
OverviewOverview
Post OGP – S&P Meeting– Summary of Meetings - 5/1 & 5/21
Post EAGE Meeting– Summary of Meeting - 7/25
Positioning Working Group– Summary of Meetings - 8/1 & 9/5
Current AccomplishmentsNext Steps
September 21, 2007 3
Post OGP – S&P MeetingPost OGP – S&P Meeting
Meeting Attendees – May 1
• Barry Barrs – ExxonMobil - Chair• Bob Firth – Troika • Stewart Levin – Halliburton• Geir Simensen – Statoil• Jan Eikelboom – Shell
September 21, 2007 4
Post OGP – S&P MeetingPost OGP – S&P Meeting
Meeting Attendees – May 21
• Barry Barrs – ExxonMobil - Chair• Rune Haglund – WesternGeco • Stewart Levin – Halliburton• Jan Eikelboom – Shell• John Conner - EnSoCo
September 21, 2007 5
Post OGP – S&P MeetingPost OGP – S&P Meeting
Summary of Meetings–Much discussion concerning what type
of positioning data is needed in SEGD• Planned Positions• As-shot• Measured• Source/Receiver
– Sercel has a proprietary format that captures this type of information
September 21, 2007 6
Post OGP – S&P MeetingPost OGP – S&P Meeting
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 7
Post OGP – S&P MeetingPost OGP – S&P Meeting
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 8
Post OGP – S&P MeetingPost OGP – S&P Meeting
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 9
Post OGP – S&P MeetingPost OGP – S&P Meeting
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 10
Post EAGE MeetingPost EAGE Meeting
Meeting Attendees – July 25• 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 11
Post EAGE MeetingPost EAGE Meeting
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 12
Post EAGE MeetingPost EAGE Meeting
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 13
Post EAGE MeetingPost EAGE Meeting
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 14
Positioning Working GroupPositioning Working Group
Meeting Attendees – August 1
• Barry Barrs – ExxonMobil • John Conner – EnSoCo• Roger Lott – Retired BP• Victor Ramirez – CGGVeritas• Jim Cain – Cain & Barnes
September 21, 2007 15
Positioning Working GroupPositioning Working Group
Meeting Attendees – September 5
• Barry Barrs – ExxonMobil • Geir Simensen – Statoil• John Conner – EnSoCo• Victor Ramirez – CGGVeritas• Jim Cain – Cain & Barnes
September 21, 2007 16
Positioning Working GroupPositioning Working Group
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 17
Positioning Working GroupPositioning Working Group
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 18
Positioning Working GroupPositioning Working Group
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 19
Positioning Working GroupPositioning Working Group
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 20
Current AccomplishmentsCurrent Accomplishments
See Current Appendix “X” for SEGD3
September 21, 2007 21
Next StepsNext 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
September 21, 2007 22
Next StepsNext Steps
Have a follow-up Meeting with full Positioning Subcommittee to review all recommendations