operations report marine seismic survey bass strait …
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OPERATIONS REPORT
MARINE SEISMIC SURVEY
BASS STRAIT
BCS-81 (TAS T.14P)
FOR
CUE MINERALS
153 DORCAS STREET,
SOUTH MELBOURNE. VIC. 3205
CLIENT REPRESENTATIVE
BY
J. NEEDHAM
GEOPHYSICAL SERVICES INTERNATIONAL
P.O. BOX 106, NORTH RYDE, N.S.W. 2113
PARTY 2931 M/V "EUGENE McDERMOTT II"
GSI-70.
RECORDING DATES: FEBRUARY 20 - FEBRUARY 24, 1981.
TABLE OF CONTENTS
SECTION TITLE PAGE
I INTRODUCTION 1
A. SURVEY VESSEL 2 - 3
B. KEY PERSONNEL 4 5
II EQUIPMENT
A. INSTRUMENTS 6 - 8
B. ANCILLARY EQUIPMENT 9 - 12
C. STREAMER 13- 16
D. ENERGY SOURCE 17 - 21
E. SURVEY 22 - 23
III OPERATIONS
A. OPERATIONS DISCUSSION 24
B. OPERATIONS SUMMARY 25
C. PROSPECT DETAILS 26 - 27
D. STATISTICS 28
E. PERMITTING 29
F. FIELD TAPE LOG INVENTORY 30 - 41
PLATE NO.
2. A.B.C.
131003
LIST OF ILLUSTRATIONS
DESCRIPTION
PROJECT LOCATION
SEG B FORMAT
3. A.B.C.D.E.
4.
5.
6.
7.
8.
9.
10.
DFS V RECORDING FORMAT
STREAMER CONFIGURATION
AIRGUN ARRAY
OFFSET DETERMINATION
ANTENNA POSITIONS
SIMRAD MODEL EA FATHOMETER SCALE
POWER SPECTRUM OF 2000 CU IN TUNEDAIRGUN ARRAY
FARFIELD SIGNATURE OF 2000 CU INTUNED AIRGUN ARRAY
13100!1
- 1 -
SECTION I
INTRODUCTION
A Marine Seismic Survey was conducted by
Geophysical Services Incorporated using the
M/V "Eugene McDermottII" in the Bass Strait
area for Cue Minerals, between February 20 and
,February 24, 1981.
The survey consisted of 550.375 kilometres
of 48 fold reflection coverage utilizing a
2400 metre streamer under continuous tow in
conjunction with a Pneumatic Acoustic Energy
S,ilirce (AIRGUNS). Operations were generally
conducted 24 hours a day.
.~", ", ~
, .
Recordings were made using one set of DFSV instruments
with two tape transports. Records were made
on 12.7 rom magnetic tape in 9 track
1600 BPI Seg. B. digital format (see Section II
Instruments).
The ships location was determined by Maxiran,
a precise radio location system, owned and
operated by O.N.I. (see Section II - Survey).
Flag
Homeport
- 2 -131e05
A. SURVEY VESSEL
M. V. "EUGENE McDERMOTT II"
Panama
Panama
Trade
Owners
Ca 11 Si gn
Length
Breadth
Depth
Draft
Official Number
Gross Tonnage
Net Tonnage
Engine Power
Foreign Going-Seismic Exploration
Geophysical Service Inc.
HO 9376
52.73 metres L.O.A.
12.19 metres
4.27 metres
3.05-3.24 metres
7062 - PEXT - 1
929.89 tonnes
249.09 tonnes
2 x 839.25 HP engines
) )
131G07
- 4 -
SECTION I
B. KEY PERSONNEL
February 20 February 24, 1981
Client Representative
Australia Marine Manager
Party Manager
Vessel Controller
Jr. Geophysicist
Instrument Engineers
Junior Observers
Survey Operators
Compressor Mechanics
Airgun Mechanics
J. Needham
R. Miles
C. Orr
A. Welfare
W. Lloyd
A. Cairns
D. Kenny
F. Hemmings
J. Anheuser
T. Hess
1. Johnson ~
J. Hennessey CMS II
D. Taylor ~
A. Hennessey ONI
W. Jenkins (Dallas)
J. Simmons
P. Stephanovich
P. Ferrier
P. Harris
D. Mercadante
M. Clark
- 5 -
SECTION I
B. KEY PERSONNEL ( Contd.)
Captain
First Mate
Boat Manager
Administrator
131GOS
M. Gusterson
G. Nilsen
J. Stanton
L. Williams
••
131GOfl
- 6 -
SECTION 11
EQUIPMENT
A. INSTRUMENTS
One Texas Instruments DFS V system consisting of two
analog modules, a control module and two ~ inch tape
transports was used for this survey. Recordings were
made in SEG. B format (see Plate 2A, B,C) at 1600 BPI.
Prior to beginning the survey, on January 27th a full
calibration and set of instrument tests as recommended
by Texas Instruments were performed on the DFS V instruments
by onboard G.S.I. personnel. These tests, recorded on both
magnetic tape and paper camera records, were couriered to
the G.S.I. processing centre in Sydney for immediate analysis
by their TIMAP system. The instrument tests included,
converter linearity, dynamic range determination, equivalent
input noise, gain accuracy, harmonic distortion, cross feed
and skew. All tests met with both Texas Instruments and
client standards.
The DFS V instruments were calibrated for 96 channel, 2 IDS
sampling rate with a 128HZ @ 72db/octave high-cut filter
and a 8HZ @ 18db/octave low-cut filter.
Instrument tests were performed each day and the results
examined in analog form onboard. These tests consisted
of: dynamic range determination, amplifier noise, automatic
gain control, tape speed and skew checks.
131C10
-7-
SECTION 11
A. INSTRUMENTS (contd.)
Tapes recorded on each transport were frequently replayed
on the other transport as a confirmation of readability.
The performance of the recording instruments was in general,
very good. On a few occasions, after backing up for the
start of a record, the transport would then run forward but
fail to write any data whatsoever. Consequently the DFS
Start was recorded as being missed. No fault was indicated
on the status display and after changing to the other
transport, the system functioned correctly. This fault
was not restricted to either transport. The resultant
missed shotpoints were relatively few.
All data was recorded on ~, Stotch brand magnetic tape.
Although the problem just related could have been attributable
to bad tapes, it was never definitely established.
II
I
.--- 1_3_1_e_1_1 e ~- 8 -
SECTION II
A. INSTRUMENTS (contd.)
Instrument Details
Recording System
Tape Transports
Tape Format
Tape Speed
No. Words/Data Scan
No. Words/Header
DFS V Serial Number 306
TWo, T.I. DFS V 10 inch,
9 track
SEG B, phase encoded 1600 BPI
79.375 ips ~
127
114 (+16 from extender header)
Channels Seismic
Waterbreaks
1 -96
Aux. channel 1+2
Recording method
Sample Period
Record Length
Gain Control Mode
Gain Constant
Final Gain
Dynamic Range
(referred to input
noise)
Filters
High-cut
Low-cut
IFP
:lIDS
5 seconds
P.G.C.
24 db
108 db
84 db
128HZ @72 db / octave
8 HZ @18 db / octave
rII
131 i '-<')..Ii... ......; 1. f. ...
- 9 -
SECTION 11
B. ANCILLARY EQUIPMENT
SERVO PROFILER
Manufacturer
Model
Serial Number
Source
Record Length
Gain Mode
Filters
High-cut
Low-cut
NOTE:
EPC Labs Inc.
4600 Graphic Recorder
371
Trace number 94
4 seconds
AGC
128 HZ @72 db/octave
8 HZ @ db/octave
The graphic recorder input is from the analog reproduce
section of the DFS V.
The profiler was marked approximately every kilometre along
all lines.
Early in the prospect, the profiler became defective and
much of the section for line BCS8l-03 was missed. The problem
was caused by a build up of self generated dust in the stylus
section of the unit and once cleaned, the unit functioned
normally.
The stylus was replaced by a new one on two occasions but the
short life of these was probably due to inexperience of the
fitting procedure by the operator on shift.
1 131C13
- 10_
SECTION II
B. ANCILLARY EQUIPMENT (cont.)
FATHOMETER
..
Manufacturer
Model
Conversion Frequency
Operating Frequency
Transducer relating
to MaXiran Antenna
(see Antenna Positions
.Plate 7
Instrument
correction for
draft
Scale
Calibrated
Simrad
EA
1478 m/sec
38 kHz
6.6 m fwd and 1.1 m to stbd
3.7 m
On Chart Paper
14 February 1980 at
Launceston, Tasmania
The Simrad Model EA has both a paper and digital
output. The display chart scale is completely
adjustable to suit depth and rate of depth changes.
The scale selected is automatically written on the
proper display by the unit. Plate No. 8 shows scale ranges.
The digital output was interfaced with the GSI
CMS II System for automatic logging on magnetic tape
at every shotpoint.
- 11 -
SECTION II
B. ANCILLARY EQUIPMENT (cont.)
FATHOMETER (cont.)
The analog chart was marked approximately every
kilometre along all lines.
No problems occurred with the Fathometer during this
survey.
- 12 -
SECTION II
B. ANCILLARY EQUIPMENT (contd.)
CAMERA
•
Manufacturer
Model
Number of Channels
Polarity
S.LE.
lOC
64
GSI Normal
Positive Pressure =Downbreak
The Camera worked well throughout the survey.
•
- 13 -
SECTION II
C. STREAMER
A G.S.I. Manufactured, 2400 metre streamer was
utilized during this survey. This consisted of
48, 50 metre "live" sections, connected together
with quick-coupling plugs. Each "live" section
~onsisted of two independent 25 metre length
groups (see plate number 4).
Generally there were seven nylon stretch sections
located between group 96 and the vessel. These
were used to attenuate the ships generated noise.
There were five nylon stretch sections connected
after group one, these sections were connected to
the tailbuoy by 115 metres of nylon rope.
Each "live" group contained 15 acceleration cancelling
hydrophones, which were connected in parallel to
produce one group. These hydrophones are used to
reduce the low frequency noise which is caused
predominantly by boat noise propagated along the
streamer, tailbuoy noise and cable strumming.
Six depth transducer sections were positioned along
the streamer at regular intervals. They were
calibrated to the required streamer depth of
40 feet before the streamer was reeled into the
sea.
- 14 -
SECTION II
C. STREAMER (contd.)
Each transducer section'contains a single hydrophone
which is used as a waterbreak detector. Waterbreak
returns from detector number six, located between
group 96 and the first front end stretch, and
detector number five, located between groups 81
and 80 were recorded on both magnetic tape and camera
records. The time measurement of the return was also
recorded on the CMS tape and printer logs.
Waterbreak number six was used to determine the
streamer offset, (centre of group 96 to the centre
of airgun array). The offset was determined manually
by the time measurement explained on plate number 6.
The offset was also calculated by the CMS. The
CMS streamer offset sensor fires a single airgun
between the DFS records. The sensor then measures
the arrival time of waterbreaks number six and five
and uses this time to calculate the offset value
which was recorded on both CMS tape and printed
logs.
The streamer offset would change during the line by+- one or two metres, a result of varying sea states
and currents which caused slight variations in the
stretched length of the nylon rope sections.
Due to ship speed changes made to maintain airgun
operating pressure, on occasions, as noted on all observer
logs and reports, the offset had to be changed between
e"O:y",, ' 'i/. '
- 15 -
SECTION 11
C. STREAMER (contd.)
lines, in order to maintain correct streamer ballast.
The average offset used during this survey was 218
metres, the offset varied between a maximum of 236
metres to a minimum of 209 metres.
Tailbuoy bearings were checked and logged at regular
intervals to ensure that feathering angle did not
exceed the specified limits.
Leakage was experienced on groups 85 & 86 early in
the survey and the traces killed whenever appropriate.
These instances are clearly indicates on the associated
logs.
An attempt
February.
to clear this leakage was made early on 21st
This attempt was thought to be successful
but it was necessary to perform further maintainance
before the problem was resolved successfully. The
final solution necessitated section 46 of the streamer
to be changed out because of salt water contamination
in the streamer fluid.
The average streamer noise during the survey was
approximately 7 U Volts.
- 16 -
SECTION 11
C. STREAMER (cont.)
STREAMER DE1AILS
Length Centre to Centre
Number of groups
Group Interval
Live Section Length
Number of Hydrophones/group:
Hydrophone Interval
Hydrophone Type
Number of Nylon Stretch
Sections in Front End
Tail End
Skin Type
Location of Depth
Transducers
131G19
2395 metres
96
25 metres
50 metres
15
1.67 metres
T.r. - A.C.H.
7
5
Tropical
Be tween Groups;
Source of Waterbreaks
Location of Control Fins
2/3, 20/21, 40/41,
60/61, 80/81, 96/FE.
In Depth Transducers
sections between
. Groups:
80/81, 96/FE
On all Depth
Transducers
Number 96
1;0"-)0'
Near Group
Streamer Sensitivity 5.15 uv/u bar
- 17 -
SECTION II
D. ENERGY SOURCE
An Electro-Pneumatic ~coustic Energy Source known
as "Airguns" was used for reflection work. The
Airgun has basically two moving parts, the shuttle
and solenoid. Compressed air is supplied' to this
unit at a pressure of 13789 kPa (2000 psi).
The shuttle is forced to close on initial application
of pressure. Compressed air fills the reservoir
chamber through a central orifice in the shuttle.
To discharge the gun an electrical current activates
the solenoid and retracts a plunger, thus enabling
compressed air to pass through a port hole to the
underside of a flange at the shuttle. The pressure
difference above and below the shuttle then thrusts
it open. The air from the chamber then escapes
through four port holes near the centre of the gun
and expands rapidly through the water, producing a
single bubble and resultant shock wave. The air
bubble collapses in a manner similar to that caused
by explosives with one notable exception in that
its period is controlled and is placed in the desired
seismic frequency band.
The energy source used by M/V "McDERMOTT II" was
a tuned airgun array, of 2000 cubic inches total
capacity, designed for deep penetration and good
resolution. This array has a broadband frequency
output that extends below the normal low frequency
band for seismic energy source.
Good primary to bubble ratio is obtained by using
a wide variety of airgun barrel sizes.
- 18 -
CI.'_lO.
SECTION II
D. ENERGY SOURCE (cont.)
Attached, Plate 5, is tpe diagram showing gun
utilization and spacings.
Average pressure obtained from the array is 55 bars
at 1 metre, with an average primary-to-bubble ratio
of 8:1 at the designed operating depth of 21 feet.
Normal operating pressure 2000 psi, with a minimum
allowable pressure of 1600 psi.
The array includes 4 low pressure open-ended air
lines so that the depth of the array could be
monitored at all times by means of static air
pressure measurements.
TIGER, the Texas Instruments Automatic Airgun
Controller, monitors the firing of each airgun
in the array. Individual gun firing times are
continuously controlled to give phasing within
+ or -1 millisecond for maximum pulse amplitude
and front to back ratio.
The TIGER also performs a quality control function,
by indicating with individual gun L.E.D. (light
emitting diode) displ~ys, the status of a gun if
not operating correctly, either no fire or self
fire. This is also logged on printer and magnetic
tape, along with changes to the total gun array
status (on/off line). TIGER operates in conjunction
with the ~ffi-11 (Configurable Marine System) that
is onboard the M/V "McDER!'lOTT II".
- 19 -
SECTION 11
D. ENERGY SOURCE (contd.)
The guns were maintained by the GSI personnel on
line changes, so that throughout the survey the
gun array was up to specifications. No malfunctions
outside the range normally encountered, were experienced.
The "McDERMOTT" uses a combination of three Le Roi
screw compressor combination with three Norwalk
reciprocating compressor.
The Le Roi machines output a low pressure (150 psi)
air to the Norwalks which. then increase this to the
working pressure of 2000 psi.
The system is designed so that any two Le Roi and any
two Norwalk machines need to be running at one time
to maintain ample working pressure at a shooting speed
of 5 knots.
However this newly designed Norwalk system has been
plauged with troubles and because of this only one
machine was able to be kept running. When this was
the case the shooting speed was kept down to a
maximum of 4.5 knots. This speed resulted in an
approximate shotpoint time interval of 12 seconds,
which was enough time for the single Norwalk to
maintain 1800 + psi.
- 20 -
SECTION 11
D. ENERGY SOURCE (contd.)
The airguns performed well throughout the survey.
Autofiring of some smaller capacity guns occured on
a few occasions when air pressure was low.
A failure of the only operational Norwalk compressor
on the run in to line BCS81-16 was only rectified at
the last minute and very nearly caused the approach
to be terminated.
This line was successfully completed but some four
hours of maintainance and repairs were then carried
out before tbe next line (BCS81-11) was attempted.
After 620 shotpoints of this line, the compressor
shut itself down again. The machine was not able to
be re-started in time to avoid a termination and a circle
was necessary to complete the line.
- 21 -
SECTION II
D. ENERGY SOURCE (cont.)
2000 CUBIC INCH - AIRGUN ARRAY
Operating Volume
Total Spare Volume
Operating Pressure
Operating Depth
Timing Control
Firing Delay
Compressors
Distance from Maxiran
antenna to Array Centre
(Refer to Antenna Positions
Plate 7
Distance from stern of
vessel to Array Centre
2000 cubic inches
520 cubic ,inches
1800 - 2000 psi
6 + 0.5 M
TIGER Serial Number 7
51.2 msec
3-Type - LeRoi Screw
3-Type - Norwalk
Reciprocating
51.1 metres
25.7 metres.
- 22 -
SECTION II
E. SURVEY
The prime navigation system used was Maxiran, a
precise range/range system owned and operated by
Offshore Navigation Inc. (O.N.I.).:
The Maxiran equipment was calibrated onshore before
the start of the survey. The accuracy of the survey
net was verified at sea by baseline crossings and
three way fixes.
O.N.I. will submit a separate full report.
The Maxiran mobile monitor was interfaced to
G.S.I.'s Configural Marine System II (CMS II).
The CMS II System consisted of a Texas Instruments
980B computer, a system co-ordinator, TIGER Airgun
Controller, automatic data logger, satellite
receiver, two Houston Instruments trackplotters
(one each located in instrument room and bridge)
and two Digi-Data, 800 bpi, ~ inch tape transports.
The CMS II function was survey control and navigation
data recording. It used the input Maxiran raw ranges
to calculate, by two or three way fixes the vessels
velocity and position.
Shotpoint positioning was done in the "distance" mode
with the CMS II triggering the DFS V instruments and
also the TIGER unit to fire the airguns at every 25
metres of travel along the preplotted survey lines.
Occasional changes to "time" mode were made when
real time shotpoints became displaced with respect
to the pre-plotted shotpoint.
- 23 -
SECTION 11
E. SURVEY (cont.)
• '.'''''.I I ~. .,
The CMS 11 satellite navigation system was utilized
as an onboard Q.C. check of the Maxiran positioning,
this staellite data was also recorded on the CMS
Magnetic tape.
Three way fixes were manually calculated at the
start and end of every line, using a TI-59 calculator
and "Three-Way Fix by Iteration" programme.
During the survey, the CMS doppler sonar was used
as the velocity source and the system gyro provided
Azimuth information.
Although the dogleg angle was effectively 0°, line
BCS8l-03 was shot as a dogleg into line BBS8l-09 of
the adjoining Bass Strait Oil & Gas Survey. The last
shotpoint was calculated to be #1152 and the seismic
recording tape was changed at that point also.
The CMS idled at shotpoint 1282 of line BCS81-04. It
was re-started by the operator but two shotpoints were
missed whilst the system was updating.
Sat./Sonar was used very briefly at one point on
line BCS8l-l0 to enable work to he done on Maxiran base
stations.
1 3 1 !/\ <) ~....li... -...: N ~
- 24 -
SECTION 111
OPERATIONS
A. OPERATION DISCUSSION
To avoid excessively long line changes,two lines of
this survey were shot before the adjacent Bass Strait
Oil & Gas Survey was completed.
The weather conditions were good throughout with seas
ranging between states 1 & 3.
Data quality was under constant check by R.A.W. on
board monitoring which enabled a high standard to be
maintained at all times. Any risk of deviation from
specification was immediately brought to the attention
of the on board client representative.
Slight interference from a passing ship was evident
for a brief period of line BCS8l-l2. Noise strips
were taken to ensure that this noise did not exceed
specifications.
~ 1_3_:!._._(\_2_8., '6''..,'\ I -1;'
•- 25 -
B. OPERATIONS SUMMARY
Feb.ruary 20th
Gal-7011
LINE BCS 81-01
LINE BCS8l-03
February 21st
LINE BCS8l-0s
1000 - 1500
LINE BCS8l-04
February 22nd
LINE BCS8l-02
LINE BCS8l-09
LINE BCS8l-l6
1730 - 1900
LINE BCS 81-11
February 23rd
LINE BCS8l-11A
LINE BCS8l-13
LINE BCS8l-08
LINE BCS8l-l0
February 24th
LINE BCS8l-l2
LINE BCS8l-l4
LINE BCS8l-07
LINE BCS8l-06
Complete
Shot as a dogleg into line BBS8l-09
last SPlls2 - complete
Traces 85 & 86 killed throughout
complete
Streamer work to eliminate leakage
Complete
Complete
Complete
Compressor problem on run in -complete
Compressor Repair
Terminated - Compressor shut down
Complete
Complete
Complete
Complete
Slight ship noise SPs 1240 -1280
Complete
Complete
Complete
Complete
BCS81-03
20th FEB BCS81-01
DATE LINE SP RANGE
0001 - 0953
0001 - 1152
TOT S.P.
953
1152
CHARGEABLE KM
23.825
28.8
COMMENTS
Complete
Complete
DAILY TOTAL
52.625
21st FEB BCS81-05 0570
0001 - 1371 1371 34.275 Complete en
'"1460 ()
BCS81-04 0001 - 1461 1461 36.525 Complete ...;....0
3260 zBCS81-02 0001 - 0430 430 10.75 Complete 81.55
>-'>-'>-'
3260 ()
22nd FEB BCS81-02 0431 - 0881 881 11.275 Complete N0-
236 0 ....,BCS81-09 0001 - 2861 2861 71. 525 Complete ;r.
0en....
BCS81-16 1490 0001 - 0718 718 17.95 Complete '"()...;
BCS81-11 05600001 - 0620 620 15.5 Terminated T B C :::J
'"..;0560 >-
BCS81-11A 0621 - 1150 530 13.25 Midnight S.P. 129.5 ....r-'
f-" en
W
0560
,....23rd FEB BCS81-11A 1151 - 1410 260 6.5 Complete (--.'.-
2360 t·)BCS81-13 0001 - 0471 471 11.775 Complete <:0
BCS8l-08 3260 0001 - 2611 2611 65.275 Complete
\1BCS81-10 1470 0001 - 2611 2611 65.275 Complete
BCS81-12 32800001 - 0180 180 4.5 Midnight S.P. 153.325
~-0-- •
~ ".,.
DATE LINE DIR SP RANGE TOT S.P. CHARGEABLE KM COMMENTS
24th FEB BCS81-12 32800181 - 2211 2031 50.775 Complete
BCS81-14 1480
0001 - 1222 1222 30.55 Complete
BCS81-07 0570
0001 - 1861 1861 46.525 Complete
BCS81-06 1460
0001 - 0221 221 5.525 Complete
DAILY TOTAL
133.375
- i-'~
tr'"',:-;:t,;,-.~
1 .) -J i~ ,;'r---------v_~-V~.~
- 28 -
SECTION 111
D. STATISTICS
GSI-70'
Prospect
Operation Period
Number of Lines
Total Production
Field Tapes Used
Production Shotpoints
Unusable shot percentage
of total shot points
Seismic Data shipped to
Navigation Data shipped
to
Bass Strait BCS8l- (TAS T.14P)
February 20th - February 24th 1981
16
550.375
354
22015
0.5
GSI - Sydney
GSI - Dallas
- 29 -
E. PERMITTING
The Marine Operations Centre, Canberra, was advised
as to the ship's location throughout the survey to
enable the necessary navigation warning to mariners
to be issued.
F. FIELD TAPE INVENTORY
- 30 -
SECTION III
DATE TAPE NO LINE NO. SHOTPOINTS
20 FEB 157744 BCS81-1 001 - 063
157745 II 064 - 128
157746II
129 - 196
157747II
197 - 263II
157748 329 - 393II
383157749 329 -II
394 - 459157750II
460 -157751 524II
525 - 589157752
157753II
590 654=II
655 - 719157754
157755II
720 - 784II
157756 485 - 850
157757II
851 - 916
" 917 - 953157758
157759 BCS81 - 3 001 - 063
157760 " 064 - 125
157761 " 128 - 192
157762 " 193 - 257
157763 " 258 - 322
157764 " 323 - 387
157765 " 388 - 452
157766 " 453 - 517
157767II
518 - 582
157768 " 583 - 647
157769II
648 - 713
GSI-70S
131 C:3 [1
• .." ".'
>'
- 31 -
DATE TAPE NO. LINE NO. SHOTPOINTS
20 FEB 81 157770 BCS81-3 714 - 778
157771 n 779 - 843
157772 n 844 - 908
157773 n 909 -973
157774 n 974 - 1038
157775 n 1039 - 1103
157776 n 1104 - 1152
21 FEB 157812 BCS81-5 001 - 063
157813 n 067 - 130
157814 n 131- 195
157815 n 196 - 260
157816 n 261 - 325
157817 n 326 - 390
157818 n 391 0 455
157819 n 456 - 520
157820 n 521 - 585
157821 n 586 - 649
157822 n 650 - 714
157823 n 712 - 779
157824 n 780 - 844
157825 n 845 - 909
157826 n 910 - 974
157827 n 975 - 1039
157829 n 1106 - 1170
157830 n 1171 - 1236
157831 n 1237 - 1301
157832 n 1302 - 1348
157833 n 1349 - 1371
157834 BCS81-4 001 - 060
157835 n 061 - 125
157836 n 126 - 190
157837 n 195 - 259
157838 n 260 - 324
GSI_70.
DATE
- 32 -
TAPE NO. LINE NO. SHOTPOINTS
21 FEB 157839 BCS81-4 325 - 389
157840 " 390 - 455
157841 " 456 - 520
157842 " 521 - 586
157843 " 587 - 653
157844 " 654 - 718
157845 " 719 - 783
157846 " 784 - 848
157847 " 849 - 913
157848 " 914 978
157849 " 979 - 1043
157850 " 1044 - 1108
157851 " 1109 - 1173
157852 " 1174 - 1238
157853 " 1239 - 1305
157854 " 1306 - 1370
157855 " 1371 - 1428
157856 " 1429 - 1461
157857 BCS81-2 001 - 062
157858 " 063 - 127
157859 " 128 - 192
157860 " 193 - 257
157861 " 258 - 322
157862 " 323 - 387
157863 " 388 - 452
157864 " 453 - 517
157865 " 518 - 582
157866 " 583 - 647
157867 " 648 - 712
157868 " 713- 778
DATE TAPE NO.
- 33 -
LINE NO. SHOTPOINTS
0.1-708
21 FEB 157869 BS81-2 880 - 843
22 FEB 157870 844 - 881
157871 BCS81-90 001 - 061
157872 " 062 - 126
157873 " 127 - 191
157874 " 192 - 256
157875 " 257 - 321
157876 " 322 - 386
157877 " 387 - 451
157878 " 452 - 516
157879 " 517 - 582
157880 " 583 - 646
157881 " 647 - 711
157882 " 712 - 776
157883 " 777- 841
157884 " 842 - 906
157885 " 907 - 971
157886 " 972 - 1036
157887 " 1037 - 1102
157888 " 1103 - 1139
157889 " 1141 - 1206
157890 " 1207 - 1272
157891 " 1273 - 1337
157892 " 1338 - 1403
157893 " 1404 - 1468
157894 " 1469 - 1533
157895 " 1534 - 1598
157896 " 1599 - 1663
157897 " 1664 - 1728
157898 " 1729 1794
13'!{\')~...---- .>LV_V,~~
-34- ~ ~
DATE TAPE NO. LINE NO. SHOTPOINTS
22 FEBRUARY 157899 BCS81-09 1795 - 1858
157900 1859 - 1923
157901 1924 - 1988
157902 1989 - 2053
157903 2054 - 2118
157904 2119 - 2182
157905 2187 - 2251
157906 2253 - 2317
157907 2318 - 2382
157908 2383 - 2448
157909 2449 - 2513
157910 2514 - 2579
157911 2580 - 2675
157912 2676 - 2710
157913 2711 - 2775
157914 2776 - 2840
157915 2841 - 2861
157916 BCS81-16 BLANK
157917 003 - 066
157918 067 - 131
157919 0132 - 196
157920 198 - 262
157921 263 - 327
157922 328 - 394
157923 395 - 459
157924 460 - 524
157925 525 - 589
157926 590 - 654
157927 655 - 707
157928 708 - 721
DATE TAPE NO.
- 35 -
LINE NO.
131G28
SHOTPOINTS
22 FEB 157929 BCS81-11 001 - 061
157930 " 062 - 126
157931 " 127 - 191
157932 " 192 - 256
157933 " 257 - 321
157934 " 322 - 386
157935 " 387 - 451
157936 " 452 - 516
157937 " 517 - 581
157938 " 582 - 631
157939 BCS81-11A 521 - 620
157940 " 621 - 685
157941 " 686 - 750
157942 " 751 - 815
157943 " 816 - 880
157944 " 881 - 945
157945 " 946 - 1010
157946 " 1011 - 1076
157947 " 1077 - 1141
157948 " 1142 - 1206
23 FEB 157949 " 1207 - 1271
157950 " 1272 - 1337
157951 " 1338 - 1390
157952 " 1391 - 1410
157953 BCS81-13 001 - 061
157954 " 062 - 126
157955 " 127 - 190
157956 " 195 - 256
157957 " 257 - 320
157958 " 321 - 381
DATE TAPE NO.
- 36 -
LINE NO. SHOTPOINTS
23 FEB 157959 BCS81-11 382 - 442
157960 " 443 - 471
157961 BeS81-08 001 - 061
157962 " 062 - 123
157963 " 124 - 187
157964 " 188 - 252
157965 " 253 - 317
157966 " 318 - 382
157967 " 383 - 447
157968 " 448 - 512
157969 " 513 - 578
157970 " 579 - 643
157971 " 644 - 707
157972 " 708 - 772
157973 " 773 - 838
157974 " 839 - 903
157975 " 904 - 968
157976 " 969 - 1033
157977 " 1034 - 1094
157978 " 1096 - 1158
157979 " 1159 - 1218
157980 " 1219 - 1281
157981 " 1282 - 1343
157982 " 1344 - 1402
157983 " 1403 - 1465
157984 " 1466 - 1528
157985 " 1529 - 1590
157986 " 1591 - 1648
157987 " 1649 - 1711
157988 " 1712 - 1773
DATE TAPE NO.
- 37 -
LINE NO.
1311.)40
SHOTPOINTS
23 FEB 81 157989 BCS81-08 1774 - 1838
157990 n 1839 - 1903
157991 n 1904 - 1968
157992 n 1969 - 2034
157993 n 2035 - 2099
157994 n 2100 - 2164
157995 n 2165 - 2229
157996 n 2230 - 2297
157997 n 2295 - 2359
157998 n 2360 - 2424
157999 n 2425 - 2489
158000 n 2490 - 2554
158001 n 2555 - 2611
158002 BCS81-10 001 - 062
158003 n 063 - 127
158004 n 128 - 192
158005 n 193 - 257
158006 n 258 - 322
158007 n 323 - 387
158008 n 388 - 452
158009 n 453 - 517
158010 n 518 - 582
158011 n 583 - 647
158012 n 648 - 712
158013 n 713- 777
158014 n 778 - 842
158015 n 843 - 907
158016 n 908 - 972
158017 n 973 - 1037
158018 n 1038 - 1103
DATE TAPE NO.
- 38 -
LINE NO. SHOTPOINTS
~~V~
23 FEB 158019 BCS81-10 1104 - 1168
158020 1169 - 1233
158021 1234 - 1298
158022 1299 - 1363
158023 1364 - 1428
158024 1429 - 1496
158025 1497 - 1558
158026 1559 - 1623
158027 1624 - 1688
158028 1689 - 1753
158029 1754 - 1818
158030 1819 - 1883
158031 1884 - 1948
158032 1949 - 2013
158033 2014 - 2078
158034 2079 - 2143
158035 2144 - 2207
158036 2208 - 2272
158037 2273 - 2336
158038 2337 - 2401
158039 2402 - 2465
158040 2466 - 2530
158041 2531 - 2594
158042 2595 - 2611
158043 BCS81-12 001 - 062
158044 063 - 122
24 FEB 158045 123 - 185
158046 186 - 245
158047 246 - 308
158048 309 - 373
DATE TAPE NO.
- 39 -
LINE NO. SHOTPOINTS
24 FEB 158049 BeS81 - 12 374 - 438
158050 439 - 496
158051 497 - 560
158052 561 - 620
158053 621 - 682
158054 683 - 745
158055 746 - 809
158056 810 - 870
158057 871 - 935
158058 936 - 1000
158059 1001 - 1065
158060 1066 - 1129
158061 1130 - 1194
158062 1195 - 1259
158063 1260 - 1323
158064 1324 - 1388
158065 1389 - 1453
158066 1454 - 1518
158067 1519 - 1583
158068 1584 - 1642
158069 1643 - 1704
158070 1705 - 1765
158071 1766 - 1828
158072 1829 - 1890
158073 1891 - 1953
158074 1954 - 2015
158075 2016 - 2075
158076 2076 - 2138
158077 2139 - 2186
158078 2187 - 2211
DATE TAPE NO.
- 40 -
LINE NO. SHOTPOINTS
24 FEBRUARY 158079 BCS81-14 001 - 055
158080 " 056 - 119
158081 " 120 - 181
158082 .. 182 - 246
158083 .. 247 - 309
158084 .. 310 - 372
158085 .. 373 - 434
158086 .. 435 - 496
158087 .. 497 - 559
158088 .. 560 - 623
158089 .. 624 - 687
158090 .. 688 - 753
158091 .. 754 - 818
158092 .. 819 - 883
158093 .. 884 - 948
158094 .. 949 - 1013
158095 .. 1014 - 1078
158096 .. 1079 - 1144
158097 .. 1145 - 1209
158098 .. 1210 - 1222
158099 BCS81-7 001 - 062
158100 .. 063 - 127
158101 .. 128 - 194
158102 .. 195 - 259
158103 .. 260 - 323
158104 .. 324 - 388
158105 .. 389 - 452
158106 .. 453 - 517
158107 .. 518 - 581
158108 .. 582 - 646
DATE TAPE NO.
- 41 -
LINE NO.
1..31G4 tl
SHOTPOINTS
24 FEBRUARY 158109 BCS81-7 647 - 711
158110 " 712 776
158111 " 777 840
158112 " 841 906
158113 " 907 -971
158114 " 972 - 1036
158115 " 1037 - 1101
158116 " 1102 - 1166
158117 " 1167 - 1231
158118 " 1232 - 1296
158119 " 1297 - 1361
158120 " 1362 - 1426
158121 " 1427 1491
158122 " 1492 - 1556
158123 " 1557 - 1621
158124 " 1622 - 1686
158125 " 1687 - 1751
158126 " 1752 - 1816
158127 " 1817 - 1861
158128 BCS81-6 001 - 062
158129 " 063 - 127
158130 " 128 - 192
158131 " 193 - 221
fI
PLATE 1 LOCATlON OF PROSPECT
,....-- 1_.3_1_C_~_4_5_ • .,
N.S.W.
ABRISBANE
OLD.
a
LI
I'-'-'-I
I
IADEFAlr;:E ACT·
'\ t")
C>- " \ .... " . ......, CA BERRAVIC. i.......
M RNE
S.A.
I
II
N.T.I II .. _._._._.L
!T R AIII
su
PLATE - LOCATION OF PROSPECT
l.-- l ----J
I"Scm
\
PLATE 2A 5EG B FORMAT
131e~G
36 2
VI...JWZZ..xu>a:.. :;w- ....><0::>z.. -
......JWZZ..xu>a:.. :;w- ....><0::>z..-
HEADER BLOCK
... w Z N '"...J a: .. ...J ...J ...J.. - W ..... wIi: N a: §s , '" za: z zw x a: w N C C Zw Z Zwen t; 2 ll' ~ a:~ ...J?J"::' ...J ...J ...J ...... .. ..0_ a: a: Wa: w w w X z x x....
~w> ;;: ...... Ww z .. w z z z u::> u uz ~ ....w 0 .... ~w·bz z z &8- >- >-...JO .... .... _...J .. .. .. a:-~a: 0°0 ::> w:> ... ;;: a:->u X<.!lz x x x .. - ..- .. -::>w a:~a: u a:, x", u o - u u u -"'w -w :;wa: CD °zO
,w'" U .. ...Jz .... :! .... - ........ ~ ~ "'wz "'z "'z !Q ):(-0"'::>
u_u "'", .... - -)(-Uj~ ~Ci ~~z
)(0 )(0W .. W 0 w_ O...J w_ .. w ::>z ::>zi!tz a: ",a: ...J a:x z .. '" ... '" "'''' "'''' '" ...... - .. - .. -
24+2"\ + "--'(NOTE 31 \I 2 3 4 ~ 6 7 8 9 10 11 12 13 14 1~ 16 17 18 19 20 21 22 23 24
P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P P
F, F, Y, Y, K, K, K5 K7 K, K" B, B, 0 M, M5 M7 R, J LC, LS 0 0 5, A 0 0 0 0 0 0 0 0 t 0 0 0 0 0 D 0 D 0 0 0
F, F, Y, Y, K, K] K5 K7 K, K" B, B, 0 M, M5 M7 R, J LC, L5 0 0 5, A 0 0 0 0 0 0 0 0 0 0 0 0 0 0 D 0 D 0 0 0
F, F, Y, Y, K, K] K5 K7 K, K" B, B, 0 M, M5 M7 R, J LC, LS 0 0 5, A t 0 t 0 t 0 t 0 1 0 0 q 0 0 D 0 D 0 0 0
F, F, Y, Y] K, K, K5 K7 K, K" B, B] t M, M5 M7 R, J LC, LS 0 0 5, A 0 0 <l 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Fz F. Yz Y. Kz K. K, K, K,o K,z Bz I 0 M. M, M, Rz Z LCz 0 0 0 5z 0 GC GW GC GW GC GW GC GW 0 0 0 0 0 0 0 0 0 0 0 0
Fz F. Yz Y. Kz K. K, K, K,o K,z Bz I 1 M. M, M, Rz Z LCz 0 0 0 5 z 0 GC GW GC GW GC GW GC GW 0 0 0 0 0 0 0 0 0 0 0 0Fz F. Yz Y. Kz K. K, K, K,o K,z Bz I 0 M. M, M, Rz Z LCz 0 0 0 5z 0 GC GW GC GW GC GW GC GW 0 0 0 0, 0 0 0 0 0 0 0 0Fz F. Yz Y. Kz K. K, K, K,o K,z Bz I t M. M, M, Rz Z LCz 0 0 0 5z 0 GC GW GC GW GC GW GC GW 0 0 0 d 0 0 0 0 0 0 0 0
, • • II ,'-----... • ~ " • _ v:::-" , . .,..,.~~~ • ~ ~ ~ • • . ,
'" ::....z ...J
0 ;! - ..w'" !!!&;
" a: w z ZWu 0°leU
ifww
° ......~;:: CD U u ui!t
~~...J3 ~ ...J
~w::> .... ..~:! Z .. a: ",...J
~ W wI>.CLO w a: Z .... ~.... u >-u ...J fZ w >- .._'" ;;:"'- .... CD '" CD'"
p p
0 8
I 4
2 2
3 t
4 8
5 4
6 2
7 t
DATA BLOCK
p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p
w, W, w5 w7 T, T, Os 0, Os 0, as 0, Os a, G, G, Os 0, Os 0, Os a, Os a, G5 G7 Os 0, Os 0, W, W, W5 w1 T, T, aS Oe W, W3 W5 W1 Os 0,W, W3 W5 W1 Tz T, 0, 0, 0, 0, a, a, a, 0, G, G3 0, 0, a, a, a, 0,:0, 0, G5 G1 a, a, a, a, w, W3 Ws W1 Tz T, 0, a, w, W3 W5 W1 a, a,w, W3 W5 W7 T3 T,o Oz 010 Oz 0'0 Oz °10 Oz 0'0 G, G3 Oz 0,0 °z °10 Oz °'0 °z 010 Gs G7 Oz 0 10 Oz 010 W, W, W5 W7 T3 T,o Oz °tC W, W3 Ws W1 Oz 0'0Wz W. W, W, T. T" °3 0" 0 3 a" 0 3 a" 03 a" G, G3 03 0" a] a" 0 3 0" 03 a" G5 G7 0 3 a" 0 3 a" Wz W· W, W, T. T" 0 3 a" Wz W• W, We 0 3 a"•Wz W. W, W, T5 T,z 0. all a. O,z a. O,z a. Oil Gz G. O. 01Z a. O,z a. O,z a. O,z G, G, a. O,z a. O,z Wz W. W, We T5 T,z a. 01Z Wz W. W, We a. O,zWz W. W, W, T, T'3 05 0,] 0 5 Ot] 05 Ot] 05 Q'3 Gz G. Q5 °'3 0 5 ·Q'3 0 5 Q'3 °5 0'3 G, G, 0 5 0'3 0 5 0,] Wz W. W, W, T, T,~ 05 °'3 Wz W. W, We °5 °'30 0 0 0 T7 T,. a, Q14 Q, 0,. Q, a,. a, 014 Gz G. 0, Q,. 0, Q,. a, 0,.10, a,. G, G, a, a,. a, a,. CH CH CH CH T7 l,. a, Q,. CH CH CH CH a, 014
1 t 1 t 0 0 0 7 0 0 7 0 0 7 0 0 7 0 Gz G. Q1 0 0 7 0 0 7 0:07 0 G, G, 0 1 0 0 7 0 1 t t 1 0 0 Q7 0 1 1 I 1 0 7 0~ ~'--------' • ~
I • ~
,~SYNC GROUP AUX 1 AUX2 AUX 3 AUX 4 AUX ~ GAl N1-4 SEIS 1 SEIS 2 SEIS 3 SEIS 4 GAIN 5-8 SEtS 5 SEIS" SYNC GROUP AUX 1 SEIS" SYNC GROUP SEIS"(NOTE 61
FIR5T DATA 5CAN 5ECOND DATA CAN LA5T DATA SCAN
p p p
0 5 2'
t 2" 25
2 21Z 2·
3 2" 2'
4 210 2z
5 2' 2'
6 2' 2°
7 2 7 0
PLATE 2B SEC B FOR1'lAT
131047
LEGEND 14 bit binary timing WOrd NOTES
Format conforms to the SEG standardspecific values shown, such as filt.r settings,etc, are those of the OFS-V.
Sample interval recorded according to the fOllowing table:
BIT SAMPLE4 5 6 7 INTERVAL
- These AUX channels are nOt availablefor data and will always be recorded aszero in the data record.
3 - Negative values are recorded in l's complement code (standard) or 2's complement (optionall.
Number of seisChannels Other than28 or 60AUX 2 upholeAUX 3 timebreakAUX 4 unusedAUX 5 unused
28 or 60Seis channels
AUX 2 unused_AUX 3 unused.AUX 4 upholdAUX 5 timebreak
1 . Auxiliary channel identification code ~s.
signments are 8S follows unless otherWisespecified: . .AUX 1 will always be the timing count.,.
2 - Additional externally supplied digitaldata may be recorded in the headerblock following byte 36+2n.
T I 4 - 1 millisecond
T I ·8,192 secondsDigitized output of AID con....erter
° -sign (note 4)s01 ·4096 milli olts
014 - 0.50 milli olt
Binary gain code for channel N.Least significant bit (6dBI is always 0 for quaternary coded IFPgain_ '. .Vertical (by tel panty. Bit P IS oneif bits 0 • 7 of the same bytecontains an e ....en number of ones_
Number of channels. Bit 6 of thefour sync group bytes, indicatesnumber of seismic data channels.
BYTE 1 2 3 424 CH 0 0 0 036CH 01004B CH 0 ·0 0 1Other 1111
See B, bytes per scan.
No_ of data channels z
Bytes per scan-14
2.5
P
CH
File number - 4 BCD digitsFormat Code· 4 BCD digits 0200for SEG-B (with no header extension)General constantS entered frompanel switches - 12 BCD digitsBytes per multiplexer scan in datablock . 3 BCD digits. Bytes perscan'" 2.5 x no. of channels +14Instrument serial number - 6 BCDdigits.Record length in mulliples of1.024 seconds. 00 jf manual stopis selected.Amplifier gain control mode·1001 is recorded to designatefloating point gain control system.Low-cut filter frequency (Hz) . 2BCD digits. 00 (out). 03. 05. 08,12, 18, or 27.NOTE: 03 is actually 3.56Hz.
05 is actually 5.33Hz.LOW-CUI filter slope in multiplesof 6 dB/octave 1 BCD digit.Normally 3. (18dS octave) forDFS-V.Notch (reiectionl filter frequency- 2 BCD digits. 00 {oull 50, or 60(for 60 or 16 2/31.Alias filter frequency:1 - 256Hz 4· 64Hz2· 128Hz B . 32HzChannel identification code:
BIT TYPEo 1 2 CHANNELo 0 0 Unused channel1 0 0 Waterbreak channelo 1 0 Timebreak channelo 0 1 Seis channelo 1 1 Uphold channel1 0 1 Time counter1 1 1 OtherRecord type:
8 . normal shot 4 1Not used2· test record 1 r
Ones recorded for normal fieldtimebreak recording. Zeros recordif system operated from internaltimebreak.
LS
J
A
o
z
GC
GW Gain word recorded as a 4-bitbinary code. 0000 is recor~dwhen operating in floating POintgain control. When operating inmanual gain control, the mostsignificant bit has a gain value of2 148dBI and the least significantbit has a gain value of 2 1 (6dBI.The least significant bit is recorded as a zero for the DFS-V.
PLATE 2C SEG B FORMAT 131e48Scm
PE INDENTIFICATION BURST INOTE 1) 1600 BPI PHASE ENCODED RECORDING .\''\OT jREFEDGE
~7mm(O.5i~15.2mm
I ~ I 15.2mm rl 15.2mmI- 10.6 in.1 -j _ 10.6 in.l- hW.6 in.l~MINI_ MINIMUM I MINIMUM MINIMUM
iJGAP PREAMa.E HEADER BLOCK POSTAMBLE INTER- BLOCK PREAMBLE OATA BLOCK PO$TAMBLE END OF FILE END OF FILE INTER-FILE PREAMBLE HEADER BLOCK
(ERASED TAPEI INOTE 21 (NOTE 31 GAP (NOTE 41 GAP INOTE 5) GAP,
43.2nwn \.- . I
I 3.06 m--J(10 ft.) I-- (1.7 in.) I HEAD PLATE THIS SIDE ~ I I l~ MINIMUM -I MINIMUM ••----------------FIRST DATA FILE ------.-,;.-----------1f---END OF FILE---!f---------SECOND DATA FILE--------i
YTAPE MOTION (TAPE VIEWED O"DE DOWN)
800 B"I NRZI RECORDING152~152mmBOTr rREFEDGE ~~mm 10.8 in., h 10.6 in.l..-l h10:6 i J..--J
MINIMUM MINIMUM MINIMUM
I,
ERASED TAPE HEADER BLOCK REDUNOANCY INTER - BLOCK OATA BLOCK REDUNDANCY END OF FILE ENO OF FILE INTER-fiLE HEADER BLOCK
ICHECKS GAP INOTE 61 CHECKS GAP !DETAIL B) GAP
(DETAIL Al
~L 1 J HEAD PLATE THIS SIDE b' t· ----i3.08 m 110 ft.) 1(~:~~ FIRST DATA FILE 1--END OF FILE---+----- SECOND OATA FILE
MINIMUM MINIMUM
A NRZI REDuNDANCY CHECKS 5 - PE end of fil. consists of 80 fluxreversals It 3200 Fel in bits P, 0, 2,6,8,Ind 7. Bits 1, 3, and .. Ire dc-er.-d.
6· 5ynchronouJ dati recording: in.r-blockgap is .rated until timebr'e.k. First stlrtof seen is then written.
D> Order WId 10000ion of tracks on tape,direction of megnetizltion ....d III oth.rapplicabte specifications in accordancewith IBM fill 5380·19, formA22-8862..... The track number for .achbit is shown in det.il C. Track numbersare the ume for 800 BPI NRZI .nd 1800BPI PEA Tr8Cks ere numbtrad conlKUti....ly with track 1 the m.ximum dis·tance from the head pllte ....d trICk 9adjacent to the head plate. See C below.
2 - Pl'Mmbfe consists of forty ch.rleterswith O-bits in all tracks followed ijy onech.r-eter with 1·bits in all trac~. (In·eludes the PIIrity track).
3· Postamb'. consists of one ch.ract~rwithl·bits in .11 tracks followed by fortych.r-eters with O·bits in .11 tracks. (I n·eludes the PIIrity treck.)
4· Synchronous recording, inter-block gapi••xtended until timebrnk is reCeived.Det. i. stored in I buffer memo~whilethe preamb.. is being written. Fi~t startof scan is written immedi.tely aher thepreambt•.
1 • PE idtntifiCition burst consists of 1600flux reY.,..... per inch in track P, alloth. tracks de .r.-d.
NOTES
TR CK NO.B
c [Y.II' 4
I) 7
,6
~ 5
~ 3
4 9,.
I.,f-- 1-1; 8
,. 2
'1 \...,. '-I IT NO. A
0 0
0 0
0 0
0 0 \GAP I I GAP
0 0
! 0 0
1 ,1 1
B. NRZI ENO OF FILE
x X X
X X X
X X X
X X X
X X X GAP
X X X
X X X
X X X
( X X X
~'A '-CRC "-LRC
KL ST BYTE OF BLDC XINDICATES BINARY VARIABLEAND MAY lIE ONE OR ZERO.DEPENDING UPON OATA
6
3
7
4
2
P
o
BIT NUMBER
PLATE 3A DFS V RECORDING SEQUENCE
CMS COMMANOSSYSTEM COOROINATOR TO FIRE A SHOT
SYSTEM CooROINATOR ISSUESOFS START TO DELAY
RECORD MODULE
DELAY RECORD MODULE PASSES
DFS STAR, TO DFS
131049
••
DFS TRANSPORT SEARCHES
BACK FOR END OF PREVIOUS
RECORD (LO.R)
AFTER RECORDING HEADER DFS
ISSUES WIRE BLAST TO
DELAy REC KltuE
ors TWSPOfl;T .I«tVES FO~
AHD WRITES HEADER
DELAY REC M)O IGHQRES THIS
AND OOES NOT ISSIJ(
A WAIT SIGtW. TO ors'>--t"">--~
OFS ISSUES FIRST STOP
TO DELAY RECORD ..xu..£
OELAY REt It)O SENDS WIRE BLAST
SIGHAl TO TIGER VIA SYS. COORD.
DELAY REt I'(lD SETS
WAIT SIGNAL TO IltttBITA/Cy FURTHER Drs SEQ(J[NC[~
D£lAY REt 1«)0 STA~TS
128 KSEC UmqvAl
TlKE aREAl tOlIlTER
0 -lJ':l0
-~ •M.....,
•
UlUZUl::>0'Ul
'"uz.....o
'"cuUl
'"1>1
TIGER ACCEPTS WIRE BLAST
SIGItAl AND GE"£I"TE5 A FIRE
REQUEST TO THE CMS
CMS SEN A FIRE
COtlWtD TO TIGER
,
2
TIGER FIRES THE GUNS AHD
GENERATES A FIELD TUt( IREAl TO
THE DELAY lEt fII)O YIA
THE SYS.. COORD.
®~
tilUZtil::>0-til
'"UZ INT£RHAl. TIME DELAY COlIUEA TJt£ BREAk IS SENT TOH
'"~ - BREAK COlJ(UR BEGINS TO DFS (DFS IGHORfS THIS0U IS RESET COUNT DCMN SIGIW. SINCE IT KAS STOPPED)til~
1>1
'"'"'"u H.\S
"" THE DELAY COUNTERtil RUCHED A VAlUE OF NOH
j 0.6 SECONDS?
""
DELAY REt MJO RESETS
WA IT 5IGHAI.. TO Drs
)
(
PLATE 3D DFS V RECORDING SEQUENCE
DFS TAPE TRANSPORT MOVES
FORWARD AND WRITES HEADER
DFS SENDS WIRE BLAST SIGNAL TO
DELAY REC MODULE AND STARTS
ITS OWN INTERNAL BREAK TIMER
DELAY REC MOD IGNORES
WIRE BLAST SIGNAL
DELAY REC MOD GENERATES A
TIME BREAK SIGNAL TO DFS
DFS RECEIVES TIME BREAK
AND INITIATES DATA. RECORDING
(lIMING WORD ZERO)
131C52
••
C
PLATE 3E DFS ~ RECORDiNG SEQUENCE
DFS TRANSPORT STOPS
DFS RESETS WIRE BLAST SIGNAL
SYS. COORD. DETECTS RESET OF
WIRE BLAST SIGNAL AND INFORMS
CMS THAT THE DFS TRANSPORT
HAS STOPPED
131e53
.0.
START OFSEQUENCE AGAIN
~-----...---------) )
TAil BUOY AND/ RAOAR REFLECTOR
•
1 10 20 30 40
2395m
50 60 70 80 90
DISPLAYED ON 6Vp?"1 IV /1 /SEiSMOORAPH TRACES 1/ 1/ 1/ 1/
RECORDED INOIOITALCHANNELS
ux AUI<1 2
25m
SHOTPOINT' SHOTPOINT 2
6 TRANSDUCER SECTIONS 4M LONG
~I-'-Wf-',--.
~.-'
~'1
,:;::. -I
Scm
MARINE CABLE DIAGRAM
2400 METRES
(OFFEND SPREAD - 96 GROUPS)
G.S.1. PARTY: ~2~9;3=-1 _
SHIP: M.V. Eugene HcDermott 11
CLIENT: Cue llinerals
AREA: Bass Strait BCSBI
DATE: 20th - 24th February 19B1
123456
~ 25m (15 Hydrophones) 50m 'I 1
IY·_~+--l·_·_...·_· •__·_·__•__·_·__·_·__·....:..I.__._J'B.83r:j .:.j 1-0. 1.67m (Typical)
LIVE SECTION 96T
AT/NEARSEISGROUP NUMBERS
DEPTH CONTROLLER AT I I I I I I I 'OnSEISQROUPNUMBERS .... -I- -I- -+- -i- ,- -i \: Depth. Transducers)
DEPTH TRANSDUCERNUMBERS
PLATE 5 AIRGUN ARRAY 131e55
•••l STERN OF VESSEL 12000 Cu In TUNED AIR GUN ARRAY
PORT STRING STARBOARD STRING
GUN No. SIZE feiJ in) SEPARATION lin) GUN No. SIZE leu inl SEPARATION linl
1. 120 • 19. 120• 182. 120 • 18 20. 120 •
3. (spare) 120 o 18 21. 120 • 18
22. (sparel 120 o 18
65
65
4. 100 •5. 100 • 18 23. 100 •6. Ispare) 100
o 18 24. Ispare) 100 018
6262
7. 80 • 25. 100 •188. 80 •9. (sparel 80 0 18 62
26. 80 •65
10. 120 • 58
27. 40 •65
5111. 100 • 28. 40 •
62 51
12. 80 • 29. 40 •58 51
13. 40 • 30. 40 •" 51 51
• 31. 20 •14. 40
5141
32. 20 •15. 40 • 41
51 33. 20 •16. 40 • 41
51 34. 20 •17. 20 • 41
35. 10 •4133.
18. 20 • 36. 10 •TOTAL LENGTH 60ft 10 in TOTAL LENGTH 60ft
GSI-"70.
I-Scm -I
fPLATE 6
·OFFSET·DETERMINATION·(EXAMPLE·ONLY)
PHYSICAL MEASUREMENT
1.
2.
3.
4.
5.
6.
Length of stretch sections with ..
9% stretch factor (4 x 5Om)
Distance two bracket to stern
Total length of Transducer
sections in front of #96
Distance from boat to near
group centre
(1+2+3+12.5 metres)
Distance from boat to centre
of source
Offset (5-4)
200 metres + 18 metres
~ 218 metres
+2.0 metres
2 metres
238.5 metres
24.1 metres
214.4 metres
TIME MEASUREMENT
As computed by the CMS-ll computer ADL. STS Systems. Typically
210 - 214 metres (computed on all lines).
PLATE 7 ANTENNA POSITIONSScm .,....-------••
CENTRE OF VESSEL
PORT STBDlI
TRANSMIT
27m1r
--i Um.---t 3Amr
o
Xf-27i
RECEIVE
; r-cO Ir<> E
r<>IfiC\J
EoV
ELOC\J
• FATHOMETER 335mBELOW SEA LEVEL
J _~START OF AIRGUN ARRAY
OMAXIRAN (DIRECTIONAL.)
FWD212mASLAFT. 23.1 m ASL
XMAXIRAN (~~~ ?1.'6~Cr~~.AL)AFT 18.3m ASL.
.6.. 9EONAV 9.7mASL ..IT LORAN 15.3m AS.L.
f PLATE 8 SHlRAD HODEL E A FATHOHETER SCALES131e58
••SIMRAD MODEL EA FATHOMETER SCALE
BASIC RANGE
A B c D
----------------------~------------------
---
PHASEo 1 2 3 4
PHASE01234
PHASEo 1 2 3 4
PHASEo 1 2 3 4
'-_0 0 . D·-----0-0----- 0
=c -- - - - _.0 TI
. ~--~~~~---~~~::~~--_:~~:~ --
~ ---------------------------
-+- ---------------------------------+----I-
+
0• 50
100150200250300350400450500550600650700750800850900
1000
HOO
1200
'"1300
1400
1500
1600
1700,,",,,
5cm
l PLATE 9
42
<r
~::E--<l-e:(
N:c
N--
36<r<l!:a:>
.....
.....0:
a:>0~
::E;::)
0:I-
30uwc...Vl
0:.....:::0Q..
.,r U-l-v>;::)
0u 24e:(.
T0 25 50 75 100 125
FREQUENCY (HZ)
Power spectrum of 2000 cu. in. tuned air gun array'
I"5cm
131e60...- . _PLA_T_E_l_O ., • '
30
20
N::I:
'"N 10......Io·
~0::«<0 0W0::::>VlVlW
g: -10u.Vl::>
·0u -20'$
-30
Pa c56.4 BAR-M (p-p, 0-125 HZ)
P/Pb c 13.5
de 25 FT (7.6M)
EAST SPAIN OFFSHORE FEB. 1978
•
o 40 80 120
TIME IMS)
160 200 240
Farfield signature of 2000 cu. in. tuned air gun array
5cm