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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