Transcript Document
SEGD Rev. 3.0
Positioning Subcommittee
Barry D. Barrs
ExxonMobil
September 21, 2007
1
Overview
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 Accomplishments
Next Steps
September 21, 2007
2
Post 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
3
Post 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
4
Post 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
5
Post 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
6
Post 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
7
Post 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
8
Post 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
9
Post 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
10
Post 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
11
Post 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
12
Post 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
13
Positioning 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
14
Positioning 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
15
Positioning 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
16
Positioning 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
17
Positioning 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
18
Positioning 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
19
Current Accomplishments
See Current Appendix “X” for SEGD3
September 21, 2007
20
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
September 21, 2007
21
Next Steps
Have a follow-up Meeting with full
Positioning Subcommittee to review
all recommendations
September 21, 2007
22