Paul's definition of "transom": The aft most part of a boat.
On the Ewing, the transom is the streamer roller.
*******************************************************************
Deployment 1 - 24 channels, 7 birds
OBS Lines. JD249-JD251
Distance from booms to 6 air guns array is 115ft or 35m
Distance from booms to transom is 2m
Distance from transom to 6 air guns = 33m
Distance from connector and deck clamp to section 5 is 150m
Distance from connector to transom is 1.8m
Distance from transom to section 5 is 148.2
Distance from section 5 connector to center of group 24 is 6.25m
Distance from transom to center of group 24 is 154.45m
Distance from guns to group 24 121.45
***** NOTE The ranges on the tape copy are off by 4m because
***** I didn't know the 6 air gun array was at 115ft
***** when shooting started. The larger air gun arrays
***** are towed at 130ft.
*******************************************************************
/home/henkart/bin/sioseis << eof
# Don't use sioseis.fast since it doesn't use IEEE
procs segdin geom diskoa output end
segdin
ffilen 99999 # take all shots (this is the preset!)
ftr 1 ltr 24 # throw out traces 25-36
fcset 1 lcset 1
offline yes # eject after the rewind after EOT
newfile yes # start a new SEG-Y file on every SEG-D tape
iunit 4 end
end
geom
fs 1 ls 999999 type 2
gxp 240 -117.35 ggx -12.5 dfls 37.5 dbrps 6.25 smear 6.25
bgp 2 1 3 6 4 12 5 18 6 14 7 30
end
end
diskoa
# write every 20th shot to a "circular" file
fno 1 lno 999999 noinc 20 rewind 1
opath /export/home/EW0008/Realtimestack/latest.shot.segy end
end
output
ontrcs 24 # force 24 traces per shot
rewind 0 # leave the tape alone!
ounit 35 # dlt
end
end
end
eof
*******************************************************************
Deployment 2 - 480 channels, 23 birds
Lines R0,1 JD 254
Distance from booms to 2 GI guns array is 130ft or 39.6m
Distance from booms to transom is 2m
Distance from transom to 2 GI guns = 37.6m
Streamer leader (measured from where?) 115m
Two stretch sections 100m
Center of group 480 6.25m
Distance transom(?) to group 480 221.25m
Distance from guns to group 480 (221.25 - 37.6) 183.65m
# Note BIRD 24 in place of BIRD 14
*******************************************************************
/home/henkart/bin/sioseis << eof
# Don't use sioseis.fast since it doesn't use IEEE
procs segdin geom diskoa output end
segdin
ffilen 99999 # take all shots (this is the preset!)
fcset 1 lcset 1
offline yes # eject after the rewind after EOT
newfile yes # start a new SEG-Y file on every SEG-D tape
tr0 yes # needed for streamer depths and compasses
iunit 4 end
end
geom
fs 1 ls 999999 type 2
gxp 480 -184.25 ggx -12.5 dfls 37.5 dbrps 6.25 smear 6.25
# Note BIRD 24 in place of BIRD 14
bgp 1 6 2 18 3 30 4 42 5 66 6 90 7 114 8 138 9 162 10 186 11 210
12 234 13 258 24 282 15 306 16 330 17 354 18 378 19 402 20 426
21 438 22 459 23 462
end
end
diskoa
# write every 20th shot to a "circular" file
fno 1 lno 999999 noinc 20 rewind 1
opath /export/home/EW0008/Realtimestack/latest.shot.segy end
end
output
rewind 0 # leave the tape alone!
# ounit2 36 # dat
ounit 35 # dlt
end
end
end
eof
*******************************************************************
Deployment 3 - 480 channels, 24 birds
Lines R3-12 JD255 - JD257
Same leader and guns as Deployment 2
NOTE All 24 birds in place
*******************************************************************
/home/henkart/bin/sioseis << eof
# Don't use sioseis.fast since it doesn't use IEEE
procs segdin geom diskoa output end
segdin
ffilen 99999 # take all shots (this is the preset!)
fcset 1 lcset 1
offline yes # eject after the rewind after EOT
newfile yes # start a new SEG-Y file on every SEG-D tape
tr0 yes # needed for streamer depths and compasses
iunit 4 end
end
geom
fs 1 ls 999999 type 2
gxp 480 -184.25 ggx -12.5 dfls 37.5 dbrps 6.25 smear 6.25
bgp 1 6 2 18 3 30 4 42 5 66 6 90 7 114 8 138 9 162 10 186 11 210
12 234 13 258 14 282 15 306 16 330 17 354 18 378 19 402 20 426
21 438 22 459 23 462 24 474
end
end
diskoa
# write every 20th shot to a "circular" file
fno 1 lno 999999 noinc 20 rewind 1
opath /export/home/EW0008/Realtimestack/latest.shot.segy end
end
output
rewind 0 # leave the tape alone!
# ounit2 36 # dat
ounit 35 # dlt
end
end
end
eof
*******************************************************************
Deployment 4 - 324 channels, 24 birds
Lines R14 through 3D-57; JD258 - JD265
Distance from booms to 2 GI guns array is 130ft or 39.6m
Distance from booms to transom is 2m
Distance from transom to 2 GI guns = 37.6m
Streamer leader (measured from where?) 85m
Center of group 324 6.25m
Distance transom(?) to group 324 91.25m
Distance from guns to group 324 (91.25 - 37.6) 53.65m
*******************************************************************
/home/henkart/bin/sioseis << eof
# Don't use sioseis.fast since it doesn't use IEEE
procs segdin geom diskoa output end
segdin
ffilen 99999 # take all shots (this is the preset!)
fcset 1 lcset 1
ftr 1 ltr 324 # recording 325-480, but it's on the reel!
offline yes # eject after the rewind after EOT
newfile yes # start a new SEG-Y file on every SEG-D tape
tr0 yes # needed for streamer depths and compasses
iunit 4 end
end
geom
fs 1 ls 999999 type 2
gxp 324 -54.25 ggx -12.5 dfls 37.5 dbrps 6.25 smear 6.25
bgp 1 6 2 7 3 18 4 30 5 42 6 66 7 90 8 102 9 126 10 138
11 162 12 174 13 186 14 198 15 210 16 222 17 234 18 246
19 258 20 270 21 282 22 294 23 306 24 318
end
end
diskoa
# write every 20th shot to a "circular" file
fno 1 lno 999999 noinc 20 rewind 1
opath /export/home/EW0008/Realtimestack/latest.shot.segy end
end
output
ontrcs 324 # Force the shots to have 324 traces per shot
rewind 0 # leave the tape alone!
# ounit2 36 # dat
ounit 35 # dlt
end
end
end
eof
*******************************************************************
Deployment 5 - 324 channels, 24 birds
SAME AS Deployment 4. BIRDS 23/24 are not reversed!
The copy script used had bgp 306 23 294 24
Lines 3D-15x to end of 3-D. JD266 - JD283
*******************************************************************
/home/henkart/bin/sioseis << eof
# Don't use sioseis.fast since it doesn't use IEEE
procs segdin geom diskoa output end
segdin
ffilen 99999 # take all shots (this is the preset!)
fcset 1 lcset 1
ftr 1 ltr 324 # recording 325-480, but it's on the reel!
offline yes # eject after the rewind after EOT
newfile yes # start a new SEG-Y file on every SEG-D tape
tr0 yes # needed for streamer depths and compasses
iunit 4 end
end
geom
fs 1 ls 999999 type 2
gxp 324 -54.25 ggx -12.5 dfls 37.5 dbrps 6.25 smear 6.25
bgp 1 6 2 7 3 18 4 30 5 42 6 66 7 90 8 102 9 126 10 138
11 162 12 174 13 186 14 198 15 210 16 222 17 234 18 246
19 258 20 270 21 282 22 294 23 306 24 318
end
end
diskoa
# write every 20th shot to a "circular" file
fno 1 lno 999999 noinc 20 rewind 1
opath /export/home/EW0008/Realtimestack/latest.shot.segy end
end
output
ontrcs 324 # Force the shots to have 324 traces per shot
rewind 0 # leave the tape alone!
# ounit2 36 # dat
ounit 35 # dlt
end
end
end
eof
*******************************************************************
Deployment 6 - 48 channels, 8 birds
OBS Lines. Day 282 - Day 283
Distance from booms to 6 air guns array is 115ft or 35m
Distance from booms to transom is 2m
Distance from transom to 6 air guns = 33m
Group 54 is on the deck
Distance from connector (group 48) and deck clamp
to next section connector (group 48) is 75m
Distance from connector to transom is 1.8m
Distance from transom to connector at group 42 is 73.2m
Distance from connector to center of group 42 is 6.25m
Distance from transom to center of group 42 is 79.45m
Distance from air guns to group 42 (79.45 - 33) 46
**** 10 meter error on tape copy script *******
Distance from booms to 2 GI guns array is 130ft or 39.6m
Distance from booms to transom is 2m
Distance from transom to 2 GI guns = 37.6m
Distance from GI guns to group 42 (79.45 - 37.6) 42m
**** 6 meter error on tape copy script *******
*******************************************************************
/home/henkart/bin/sioseis << eof
# Don't use sioseis.fast since it doesn't use IEEE
procs segdin geom diskoa output end
segdin
ffilen 99999 # take all shots (this is the preset!)
ftr 1 ltr 24 # throw out traces 25-36
fcset 1 lcset 1
offline yes # eject after the rewind after EOT
newfile yes # start a new SEG-Y file on every SEG-D tape
iunit 4 end
end
geom
fs 1 ls 999999 type 2
gxp 42 -36 ggx -12.5 dfls 37.5 dbrps 6.25 smear 6.25
bgp 1 1 2 7 3 12 4 18 5 24 6 30 7 36 8 42
end
end
diskoa
# write every 20th shot to a "circular" file
fno 1 lno 999999 noinc 20 rewind 1
opath /export/home/EW0008/Realtimestack/latest.shot.segy end
end
output
ontrcs 48 # Force the shots to have 324 traces per shot
rewind 0 # leave the tape alone!
ounit 35 # dlt
end
end
eof
*******************************************************************
Deployment 7 - 480 channels, 24 birds
Lines R13- JD284 -
Same streamer geometry as Deployment 2. Different bird location.
Different from earlier deployments because:
1) New geom TYPE 9 using LDEO nav block lat/long rather than assuming
shot numbers are 37.5m apart.
2) Save the long/lat in SEG-Y words 59 & 60
3) Also removed parameter offline so tape is not ejected after copy
*******************************************************************
sioseis << eof
procs segdin header geom diskoa output end
segdin
ffilen 99999 # take all shots (this is the preset!)
fcset 1 lcset 1
! offline yes # eject after the rewind after EOT
newfile yes # start a new SEG-Y file on every SEG-D tape
tr0 yes # needed for streamer depths and compasses
iunit 4 end
end
header # save long/lat in 59, 60 before geom clobbers it
fno 0 lno 999999 ftr 0 ltr 999 l59 l19 l60 l20 end
end
geom
fs 1 ls 999999
type 9 ! New binning by realtime lat/long
! type 2 ! each shot number increases dfls
gxp 480 -184.25 ggx -12.5 dfls 37.5 dbrps 6.25 smear 6.25
bgp 1 6 2 18 3 42 4 54 5 78 6 90 7 114 8 138 9 162 10 186
11 210 12 234 13 246 14 258 15 282 16 306 17 330 18 354
19 378 20 402 21 426 22 450 23 462 24 474
rpadd 1000
end
end
diskoa
# write every 20th shot to a "circular" file
fno 1 lno 999999 noinc 20 rewind 1
opath /export/home/EW0008/Realtimestack/latest.shot.segy end
end
output
rewind 0 # leave the tape alone!
ounit 35 # dlt
end
end
end
eof
Return to EW0008 example.
Return to SIOSEIS examples.
Go to the list of seismic processes. Go to SIOSEIS introduction.