Transcript Project Overview

Technical Standards Committee
meeting
75th SEG Houston
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
• Handle “large” channel counts consistent with
modern recording systems
• Maintain 80 column format of current SPS
• Maintain limited backwards compatibility
75th SEG Houston
SPS Review
75th SEG Houston
SPS X (relational file)
relational record specification
Item
1
definition of field
cols
format
min. to max
default
just.
record identification
1–1
1-1
A1
A1
"x"
"x"
none
n/a
2–7
2-7
3A2
3A2
free
free
none
right
0 to 9999
0 to 16777216
none
right
1 to 9
1 to 9
1
right
1 to 9
1 to 9
1
right
4A4
F10.2
free
-999999.99 to
9999999.99
none
left
2A4
F10.2
free
-999999.99 to
9999999.99
none
right
I1
I1
1 to 9
1 to 9
1
right
record identifier: unchanged.
2
field tape number
field tape number: unchanged
8 – 11
I4
8 - 15
I8
field record number: expanded to i8 to be compatible with SEGD.
12 – 12
I1
4
field record increment
16 - 16
I1
field record increment: unchanged.
13 – 13
A1
5
instrument code
17 - 17
A1
instrument code: unchanged.
*3
6
field record number
line name
14 – 29
18 - 27
line name: to be compatible with the SEGD format.
7
point number
30 – 37
28 - 37
point number to be compatible with the SEGD format.
38 – 38
8
point index
38 - 38
point index: unchanged
75th SEG Houston
SPS X (relational file) Cont’d
*9
from channel
39 – 42
39 - 43
I4
I5
1 to 9999
1 to 99999
none
right
from channel: format changed from i4 to i5, to handle larger channel counts (100000 actives channels)
*10
to channel
43 – 46
44 - 48
I4
I5
1 to 9999
1 to 99999
none
right
to channel: format changed from i4 to i5, to handle larger channel counts (100000 actives channels)
11
channel increment
47 – 47
49 - 49
I1
I1
1 to 9
1 to 9
1
right
48 – 63
50 - 59
4A4
F10.2
free
-999999.99 to
9999999.99
none
left
2A4
F10.2
free
-999999.99 to
9999999.99
none
right
2A4
F10.2
free
-999999.99 to
9999999.99
none
right
I1
I1
1 to 9
1 to 9
1
right
channel increment: unchanged.
12
line name
line name: to be compatible with the SEGD format.
13
from receiver
64 – 71
60 - 69
from receiver: to be compatible with the SEGD format.
14
to receiver
72 – 79
70 - 79
to receiver: to be compatible with the SEGD format.
15
receiver index
receiver index: unchanged.
75th SEG Houston
80 -80
80 - 80
SPS S & R (Point file)
(source and receiver)point record specification
definition of field
cols
format
min. to max
default
just.
record identification
1-1
1-1
A1
A1
“s” or “r”
“s” or “r”
none
n/a
2-17
2-11
4A4
F10.2
free
-999999.99 to
9999999.99
none
left
free
-999999.99 to
9999999.99
none
right
1 to 9
1
right
record identification: unchanged.
line name
line number: to be compatible with the SEGD format.
point number
18-25
12-21
2A4
F10.2
point number: to be compatible with the SEGD format.
point index
26-26
I1
point index:
All other fields remain the same
75th SEG Houston
units
SEGD Review
75th SEG Houston
SEGD Review
• File number
Use of the extended file number currently available should suffice until SEG-E
1 – 16,777,216
• Channel number
Use 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 time
Should be recorded in the auxiliary channel header that corresponds to the
recorded uphole signal (0 – 99ms to be consistent with SPS)
• General Header
Needs 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 attention
75th SEG Houston