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Technical Standards Committee meeting. SEGD & SPS Revision Goals. Establish consistency between SEGD and SPS Source line and source point numbers Receiver line and receiver point numbers File numbers Handle “large” file numbers - PowerPoint PPT Presentation
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75th SEG Houston
Technical Standards Committee Technical Standards Committee meetingmeeting
75th SEG Houston
SEGD & SPS Revision GoalsSEGD & SPS Revision Goals
• Establish consistency between SEGD and SPS – Source line and source point numbers
– Receiver line and receiver point numbers
– File numbers
• Handle “large” file numbers
• Handle “large” channel counts consistent with modern recording systems
• Maintain 80 column format of current SPS
• Maintain limited backwards compatibility
75th SEG Houston
SPS ReviewSPS Review
75th SEG Houston
SPS X (relational file)SPS X (relational file)relational record specification
Item definition of field cols format min. to max default just.
1 record identification1 – 11 - 1
A1A1
"x""x"
none n/a
record identifier: unchanged.
2 field tape number2 – 72 - 7
3A23A2
free free
none right
field tape number: unchanged
*3 field record number8 – 118 - 15
I4I8
0 to 99990 to 16777216
none right
field record number: expanded to i8 to be compatible with SEGD.
4 field record increment12 – 1216 - 16
I1I1
1 to 91 to 9
1 right
field record increment: unchanged.
5 instrument code13 – 1317 - 17
A1A1
1 to 91 to 9
1 right
instrument code: unchanged.
6 line name14 – 2918 - 27
4A4F10.2
free -999999.99 to 9999999.99
none left
line name: to be compatible with the SEGD format.
7 point number30 – 3728 - 37
2A4F10.2
free -999999.99 to 9999999.99
none right
point number to be compatible with the SEGD format.
8 point index38 – 3838 - 38
I1I1
1 to 91 to 9
1 right
point index: unchanged
75th SEG Houston
SPS X (relational file) Cont’dSPS X (relational file) Cont’d
*9 from channel39 – 4239 - 43
I4I5
1 to 99991 to 99999
none right
from channel: format changed from i4 to i5, to handle larger channel counts (100000 actives channels)
*10 to channel43 – 4644 - 48
I4I5
1 to 99991 to 99999
none right
to channel: format changed from i4 to i5, to handle larger channel counts (100000 actives channels)
11 channel increment47 – 4749 - 49
I1I1
1 to 91 to 9
1 right
channel increment: unchanged.
12 line name48 – 6350 - 59
4A4F10.2
free -999999.99 to 9999999.99
none left
line name: to be compatible with the SEGD format.
13 from receiver64 – 7160 - 69
2A4F10.2
free -999999.99 to 9999999.99
none right
from receiver: to be compatible with the SEGD format.
14 to receiver72 – 7970 - 79
2A4F10.2
free -999999.99 to 9999999.99
none right
to receiver: to be compatible with the SEGD format.
15 receiver index80 -80 80 - 80
I1I1
1 to 91 to 9
1 right
receiver index: unchanged.
75th SEG Houston
SPS S & R (Point file)SPS S & R (Point file)
(source and receiver)point record specification
definition of field cols format min. to max default just. units
record identification1-11-1
A1A1
“s” or “r”“s” or “r”
none n/a
record identification: unchanged.
line name2-172-11
4A4F10.2
free-999999.99 to 9999999.99
none left
line number: to be compatible with the SEGD format.
point number18-2512-21
2A4F10.2
free-999999.99 to 9999999.99
none right
point number: to be compatible with the SEGD format.
point index 26-26 I1 1 to 9 1 right
point index:
All other fields remain the same
75th SEG Houston
SEGD ReviewSEGD Review
75th SEG Houston
SEGD ReviewSEGD Review• File number
Use of the extended file number currently available should suffice until SEG-E1 – 16,777,216
• Channel numberUse multiple channel sets - 9999 channels per set
• X,Y,Z and T and flag To permit the recording of individual vibrator locations for individual sweeps for HFVS and
similar vibrator operations.Since the recorded vibrator signals (BP, RM & GF) will be recorded in the auxiliary channels we propose recording the position information in the aux channel headers. The flag (pre-plan, surveyed, actual…..) can also be recorded in the header.
• Uphole timeShould be recorded in the auxiliary channel header that corresponds to therecorded uphole signal (0 – 99ms to be consistent with SPS)
• General HeaderNeeds to include all topographical survey information required for correct positioning: datums, map projections, transformations, etc … Or .. Use reference to database from PetroConsultants http://www.remotesensing.org/geotiff/proj_list/guid7.html
75th SEG Houston
Thank you for your attentionThank you for your attention
