Transcript SPS 3.0 - seg.org

SPS 3.0
Update of the Progress of the SPS
Subgroup of the SEG Technical
Standards Committee
Cignoli, J.E.; Green, P.C.; Hubbell, S.E.; Moffitt, R.G.; Siddiquee, F; Bowes, A.W.; LaFon, S.K.;
Musser, J.A.; Omar, W.; Zahrani, S. (Saudi Aramco)
November, 2012
SPS 3.0 Considerations and Features
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• SPS v3.0 should be fully compatible with SEGD v3.0.
• Proposed SPS v3.0 records all require less than 150 columns (as
recommended by OGP) and still have room for expansion before that
limit is reached.
• Decided actions with regard to compatibility with OGP
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Adopt comma delimited format so expansion of fields becomes irrelevant
Adoption of micro second timing (required)
Adoption of OGP definition of time reference from header (also in SEGD3.0)
Adopt the OGP header formats, unless there is a direct conflict with SEGD3.0
SPS 3.0 Considerations and Features
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SEGD supports Short Mother Records (SMR), in which multiple source events
(daughter records) are recorded in a single file, resulting in a many-to-one
relation of source point records to an FFID on tape.
new four file method to address SMR type data
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Source event descriptor file
S_FILE
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Receiver event descriptor file
Acquisition instance descriptor file
R_FILE
M_FILE
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Survey Geometry/Relational file
X_FILE
describes x,y,z,t, daughter record information
ordered in increasing time acq sequence
describes x,y,z,t, information
describes SMR, daughter record, t information
keyed on daughter record ID
ordered in increasing time acq sequence
relates source, receiver,
SMR [mother record], daughter record
keyed on daughter record ID
ordered in increasing time acq sequence
This holds with our earlier position to create new files for new functions
 application for microseismic/frac monitoring
 application for node recording
t
X
Y
Mother Record Big Box
Daughter Record
Small Boxes
Daughter Records may overlap in space and/or in time
SPS 3.0 Considerations and Features
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BIG BOX concept – mother and daughter records
Example instance of files supporting SMR acquisition on a project
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This was a modified 3 file system, [S, R, X] utilized for a Saudi Aramco project, but is not intended
to be promoted for SEG industry standard as it did not incorporate the aspects of OGP
compatibility.
SMR support files provided the information required to extract daughter records from
the mother record files, and to define the geometry similar to conventional SPS files. .
The key differences to SEG SPS Rev. 2.1 format are:
• Times are quoted to the microsecond accuracy (S_FILE)
• Point index is increased to 2 digits (S_FILE and R_FILE)
• Point code is increased to 3 digits (S_FILE and R_FILE)
• Channel “from” and “to” are increased to 6 digits each (X_FILE)
• The file count within a mother record is added (X_FILE)
• The FFID of daughter records within mother records is added (X_FILE)
• SPS files cover a day’s shooting (multi-swaths on a SEG-D archive tape)
SPS 3.0 Considerations and Features
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Additional input relating to OGP compatibility, handling SMRs and subsequent
separated daughter records is solicited from industry participants. The current
recommendations are Aramco-centric mainly because we have received little
feedback from seismic industry service providers when solicited. Prior requests
for regular participation from industry have gone unanswered.
It would enable the progress of the SPS3.0 committee to move faster with the
assistance of a technical writer – such as Jim Richards did for the documentation
of SPS v2.1. Would SEG hire a technical writer for this purpose?