Special Event Log
Party :Monarch
Seq#: 139
Survey: 9269
Dir: 287
Client :ExxonMobil
FSP :3498
Line : G03A2000B139
LSP :1868
Comments
GENERAL SURVEY PARAMETERS: Gippsland Basin
RECORDING SYSTEM : MSX / CRS
STREAMERS : 7 X 5000 METERS
STREAMER SEPARATION: 100 METERS
TOTAL CHANNELS : 2800
RECORDING FILTERS
LOW CUT : 2 Hz/12 dB per oct.
HIGH CUT : 206 Hz/264 dB per oct.
STREAMER DEPTH : 9 METERS
RECORD LENGTH : 6.5 SECONDS
SHOT POINT INTERVAL: 18.75 METERS
GROUP INTERVAL : 12.5 METERS
SOURCE DEPTH : 8 METERS (DI s ARE 1 METER ABOVE THE GUN)
SOURCE VOLUME : 3000 CUBIC INCHES X 2
SOURCE SEPARATION : 50 METERS
CENTER OF SOURCE TO CABLE REFERENCE POINT: 126 METERS
CENTER OF SOURCE TO CABLE LAST GROUP : 5102 METERS
---------------------------------------------------------------
BOL WEATHER: NW @ 15 Knots SEAS: 1.5 m. PITCH: 75%
EOL WEATHER: NW @ 18 Knots SEAS: 1.5 m. PITCH: 70%
DUMMY FILES : 1, 1672
BOL NOISE FILE: 2 = 2 Hz.
3 = 8 Hz.
EOL NOISE FILE: 1673 = 2 Hz.
1674 = 8 Hz.
SPECIAL EVENTS: * Cable #1 not used d/t intermittent bird line dropout. *
Intermitent sea noise visible throughout line on approx. 3%-5% of traces affecting all traces.
Depth control poor SP 1940-EOL due to heavy tail current
Edit SP 2800-2450 due to ship noise.
EXTERNAL NOISE FROM:
AHEAD : Ship noise visible SP 2800-2755, approx 5uB RMS.
ASTERN: Ship noise now visible astern > 20 uBars on SPs 2665-2615
Ship noise cont.now at approx. 15-20 uBars on SPs 2615-2590
Ship noise decreasing to approx.10-15 Ubars on SPs 2590-2555
Ship noise now at approx. 5-10 uBars on SPs 2555-2505
Ship noise decreasing to < 5 uBars at SP 2505-2445
ABEAM : Ship noise visible on SPs 2755-2685 at approx. 15-20 uBars
Ship noise increasing > 20 uBars on SPs 2685-2665
BAD BIRD DIs
C(1): NIL
C(2): 1 dead
C(3): NIL
C(4): NIL
C(5): NIL
C(6): NIL
C(7): 1 dead
BAD GUN DIs
GS(1): NIL
GS(2): NIL
GS(3): NIL
GS(4): NIL
GS(5): NIL
GS(6): NIL
GS(7): NIL
GS(8): NIL
BAD GUN PIs
GS(1): NIL
GS(2): NIL
GS(3): NIL
GS(4): NIL
GS(5): NIL
GS(6): NIL
GS(7): NIL
GS(8): NIL
BOL NOISE: EOL NOISE:
C(1): 4.6 C(1): 5.0
C(2): 3.9 C(2): 4.4
C(3): 4.1 C(3): 4.5
C(4): 3.0 C(4): 3.9
C(5): 2.9 C(5): 4.0
C(6): 2.9 C(6): 4.5
C(7): 3.4 C(7): 4.7
---------------------------NAVIGATION ------------------------
3590 NAVIGATION TAPE NUMBER: G03A-P294-T10
P2 FILE USED: G03A2000B139.0.p294
NAVIGATION COMMENTS:
Dead at SOL
Float GPS: T7R01,T2R01
Acoustics: S3T01, S7T07
V1T01 Ranges poor/unuseable
Compasses: S2C1, S7C1
NAVIGATION ONLINE COMMENTS:
Rapid current changes causing some steering difficulties
2760 manually reset crab angle on bride
2600 wide separation tail 4-5
---------------NAVIGATION PROCESSING----------------
FSP: 3498
LSP: 1868
FEATHER ANGLES
MIN: -18.3
MAX: 7.8
PRIMARY NAVIGATION: Multifix 2 (vesref 3)
GYRO USED IN PROCESSING: spectra gyro 2
ACOUSTICS NOT USED: 51101, 52301, 52707
FANBEAM NOT USED:
GPS TARGETS NOT USED: 64201, 64701
COMPASSES NOT USED: 1201, 1701
SPECIAL COMMENTS:
Cable 1 deleted in Unavchk d/t bird line leakage. Unavchk cable 1 - 6 are
actual cables 2 - 7.
Poor acoustic ranges for Cable 4 front network.
*********************LINE ACCEPTANCE***************************
*****(SIGNING IS ACCEPTANCE OF THE LINE)*****
NAVIGATION PROCESSING:_________________________________________________
QUALITY CONTROL_____________________________________________
SEISMIC PROCESSING__________________________________________
COORDINATOR_________________________________________________
CLIENT REP.__________________________________________________
Return to Line List