AMSN09 SEISMIC SURVEY OL 4 & EP 115 NORTHERN …

AMSN09 SEISMIC SURVEY

OL 4 & EP 115

NORTHERN TERRITORY

ACQUISITION REPORT

Compiled by: A. White Santos Ltd.

November 2011

TABLE OF CONTENTS

1 INTRODUCTION ................................................................................................................................... 3

1.1 GENERAL ................................................................................................................................................ 3

1.2 TIMETABLE OF MAIN EVENTS ........................................................................................................ 3

2 SURVEY SCOPE AND OBJECTIVES ................................................................................................. 5

3 DATA ACQUISITION ............................................................................................................................ 6

3.1 PERMITTING ......................................................................................................................................... 6

3.1.1 GENERAL ......................................................................................................................................... 6

3.2 LOGISTICS AND COMMUNICATIONS ............................................................................................ 6

3.3 SURVEYING ........................................................................................................................................... 6

3.4 CULTURAL HERITAGE CLEARANCE ............................................................................................ 6

3.5 LINE PREPARATION ........................................................................................................................... 7

3.5.1 EQUIPMENT .................................................................................................................................... 7 3.5.2 OPERATIONS ................................................................................................................................... 7

3.6 DRILLING ............................................................................................................................................... 8

3.6.1 EQUIPMENT .................................................................................................................................... 8 3.6.2 OPERATIONS ................................................................................................................................... 8

3.7 RECORDING .......................................................................................................................................... 9

3.7.1 EQUIPMENT .................................................................................................................................... 9 3.7.2 RECORDING PARAMETERS ........................................................................................................ 10 3.7.3 OPERATIONS ................................................................................................................................. 10

3.8 WEATHERING SURVEY .................................................................................................................... 11

3.8.1 GENERAL ....................................................................................................................................... 11

3.9 ENVIRONMENT ................................................................................................................................... 12

3.9.1 GENERAL ....................................................................................................................................... 12 3.9.2 OPERATIONAL OBSERVATIONS ................................................................................................. 12 3.9.3 RESTORATION ............................................................................................................................... 12

APPENDIX 1 – DSS POSITIONING FINAL OPERATIONS REPORT(S) ................................................ 13

APPENDIX 2 – TERREX SEISMIC FINAL OPERATIONS REPORT ...................................................... 14

APPENDIX 3 - RECORDING PRODUCTION STATISTICS ...................................................................... 15

APPENDIX 4 - PERSONNEL LIST ................................................................................................................. 17

APPENDIX 5 – DRILLING PRODUCTION .................................................................................................. 19

APPENDIX 6 - TAPE LIST ............................................................................................................................... 22

APPENDIX 7 - MAPS ........................................................................................................................................ 24

1 INTRODUCTION

1.1 GENERAL

In the year 2011 Santos Ltd., as operator of OL 4 carried out approximately 8.5 linear kilometres of 2D seismic imaging in the Mereenie field area as the AMSN09 Mereenie 2D Seismic Survey.

The following table details the companies involved in the acquisition of the survey.

Activity Contractor

Line Preparation Terrex Contracting Pty. Ltd Surveying Dynamic Satellite Surveys Pty Ltd Seismic Recording Terrex Seismic (Crew 402) Shothole Drilling Gorey Cole Drillers Pty Ltd Shothole loading Nedrill Blasting Contractors Pty Ltd

Santos Ltd contracted Anthony Kenny and John Allen to supervise the various phases

of the field operations. Sections below, describing field operations, are largely drawn from their observations.

It should be noted that the survey was originally scheduled for recording in October

2009, however the required shot hole drill rig was unavailable so operations had to be delayed after line preparation and surveying was completed. It was some 21 months later before Santos managed to coordinate a seismic crew passing by and an available drill rig to complete the survey.

Processing of the seismic data was carried out in house by Santos, and will be the

subject of a separate report. This report describes the data acquisition of AMSN09 Mereenie 2D Seismic Survey,

located around the West Mereenie #15 well, located in the Mereenie Field approximately 280km west of Alice Springs in the Northern Territory.

1.2 TIMETABLE OF MAIN EVENTS

Date Activity 20/08/2009 Notice of Intention sent to DPIFM 11/09/2009 Sacred Site Clearance certificate issued. 25/09/2009 Line preparation commenced & completed. 25/09/2009 Survey commenced. 25/09/2009 Survey completed.

5/05/2011 Line preparation (re-open line) commenced &

completed. 5/05/2011 Re-pegging of line commenced. 6/05/2011 Re-pegging of line completed. 6/05/2011 Shot hole drilling commenced. 8/05/2011 Shot hole drilling completed.

17/05/2011 Seismic recording commenced. 19/05/2011 Seismic recording completed.

Mereenie

2 SURVEY SCOPE AND OBJECTIVES

Seismic data derived from 2D surveys conducted during the 1980’s was generally fair but deteriorated markedly over the crest of the Mereenie anticline. Therefore, this trial was designed to evaluate different energy sources, spatial sampling and optimum recording parameters. It would also allow a cost/benefit, analysis of a follow up, high definition 3D seismic survey over the Mereenie oil and gas field.

Such a detailed survey has the potential to significantly reduce the geological risk of

future development drilling through improved fault delineation, structural mapping and reservoir characterisation.

In addition to the field trials, acquired data would be subjected to different processing

techniques in order to evaluate any improvements in imaging.

Line Start Stn End Stn Length (km)

AMSN09-01 1000 1850 8.50

Stn Int = 10m

Total: 8.50

3 DATA ACQUISITION 3.1 PERMITTING

3.1.1 GENERAL

The programme was located within the boundaries of the Haasts Bluff Aboriginal Trust. The Central Lands Council was initially advised of forthcoming seismic operations by letter, with attached maps etc. The CLC was responsible for all negotiations directl with representatives of the Traditional Owners. All conditions of entry were provided to Santos by the CLC following on from a field inspection.

3.2 LOGISTICS AND COMMUNICATIONS All companies involved in the acquisition of this survey were housed in the Santos

Mereenie camp facility for the duration of all activities. Senior management of Terrex Contracting and Terrex Seismic were located in Perth and Brisbane.

All supplies and freight was road transported to the crew by Terrex from Alice Springs. Drinking water was provided at the Santos Mereenie Camp facility. Most other equipment and personnel logistics were supported from Terrex Seismic’

Brisbane office. 3.3 SURVEYING Horizontal and vertical surveying of seismic lines, using Novatel GPS receivers and

ancillary equipment, was carried out by Dynamic Satellite Surveys Pty Ltd. Line Preparation, pegging and surveying was first conducted in September 2009.

At that time the line was surveyed and all geophone stations marked at 10m intervals. Every tenth station was marked with a wooden peg and the remainder of stations were marked with a coloured pin flag. However, due to the forced project deferral in 2009, all wire station markers were removed. In the intervening period up until May 2011, all the wooden markers installed were either dislodged or removed by animals. It was therefore necessary to again survey and peg the entire 8.5 kilometres of line. This was accomplished using a vehicle mounted GPS with reference to the original survey data. Every tenth station was marked by a numbered wooden peg with wire pin flags marking the 10m spaced stations in between.

The re-surveying and pegging was completed in one and a half days and the surveyor demobilised on May 6, 2011.

Operations, personnel and equipment are fully detailed in their Prospect Report, which

is appended hereto (Appendix 1). 3.4 CULTURAL HERITAGE CLEARANCE

The Mereenie 2D project falls within an area administered by the Haasts Bluff Aboriginal Land Trust. Santos engaged the services of Traditional owners, via existing agreements between the Traditional Owners, the Central Lands Council and Santos, to perform a pre clearance (ie: scout ahead of any line preparation activities commencing) to locate, mark and provide detours to direct subsequent line preparation activities around any cultural heritage sites found.

Santos were not party to this inspection, nor any site details located, however we were issued a Sacred Site Clearance Certificate granting us access t the area with a number of specific restrictions, including approval to operate in a specified corridor.

3.5 LINE PREPARATION

3.5.1 EQUIPMENT Line preparation was carried out by Terrex Contracting who supplied a total of two

personnel. Terrex contracting supplied the following equipment:

1 x Komatsu D65EX bulldozer 1 x Kenworth prime mover

1 x Toyota 4x4 utility 1 x Low loader

3.5.2 OPERATIONS Line preparation was initially completed in September 2009. Personnel travelled to Alice Springs on September 23rd and stayed overnight. The following day they travelled as a group to Mereenie, leaving at 0800 hrs and arriving at 1145. The distance is 280 km, of which the first 125 km to Hermannsburg is good bitumen and the remanning 155 km is gravel, ranging in quality from reasonable to very corrugated and rough, mostly the latter. On arrival, personnel met with Santos Mereenie field personnel for inductions. The start-up was also attended by Col Stanton, a representative of the NT government. Col was onsite to provide guidance on acceptable line preparation standards in the Northern Territory. Col did not stay for the line prep work due to other commitments. GPS guidance was installed in the dozer of the afternoon of the 24th. Line preparation commenced on the morning of the 25th, following the morning toolbox meeting. Line preparation progressed very quickly. The section of line north of the West Mereenie 15 well was predominantly located on an access road where no line preparation was required. South of the Wes Mereenie 15 well, was predominantly an overlap with a 1987 seismic line and was very easy going. Most did not require any dozing at all. The southern most 1.6km of line was new seismic line and did require relatively minor preparation. The terrain south was mostly flat sandy Spinifex plains with some very low static dunes and some mulga forest. There was one stand of Desert Oak across the line but this was sparse and easily traversed. On the way back the dozer operator cleaned up any windrows either by back blading them out or running the tracks along them. Dozing was completed before lunch on the 25th and the TC personnel loaded the dozer back on the float for departure the next day. Unfortunately, the project was suspended following the completion of line preparation due to unavailability of the required drilling rig. It was some 21 months later before the project resumed. In the interim, unseasonably heavy rains in 2010 and early 2011 encouraged substantial regrowth of Mulga, Blue gum, Spinifex and other herbs and grasses. It was therefore necessary to reopen the line so that the deferred trials could be undertaken in a safe and efficient manner.

Terrex Contracting had earthmoving equipment stacked in Alice Springs and were able to mobilise a bulldozer and appropriate personnel to Mereenie on May 4, 2011. A surveyor also accompanied this group to re-peg the line. Preparation work was once again straight forward and only minimal blade work was required. If anything, vegetation levels in 2011 were higher than that originally found in 2009, due to the extensive rains the area experienced in the interim period. There was no deviation from the earlier line apart from a new 20m section prepared at right angles to the original at station 1575.5. This was done to enable the drilling of four, six metre deep holes required for dynamite charge size comparison tests. Work was completed on May 5. Personnel and equipment demobilised to Alice Springs the following day.

3.6 DRILLING

Alice Springs based drilling contractor, Gory & Cole Drillers Pty Ltd were contracted to drill, case and cap eighty four (84) Kelly depth holes into which explosive charges were to be loaded and detonated, the seismic responses then processed and compared with those obtained over the same station range by the surface vibroseis method.

3.6.1 EQUIPMENT

1 x Ingersoll Rand TH60 hydraulically driven top-head drive drilling rig with IR

750cfm/250psi compressor and drill stem carousel. Rig mounted on 6x4 Paystar with dual rear wheels and 3 hydraulic levelling jacks.

10 x 6m lengths 4.5” drill stems 2 x 6” Button hammer bits 2 x 6” Chevron blade bits 85 x 6m lengths of 90mm diameter PVC storm water pipes with end caps (supplied

by Santos Ltd) 1 x Acco twin steer, 8 wheel water truck fitted with 2,000lt diesel and 5,000lt water

tanks. 6.5m flat deck for drill stem 1 x Toyota 4x4 utility

3.6.2 OPERATIONS

Drilling personnel and equipment mobilised to Mereenie on May 5 and on arrival the driller and both offsiders completed the mandatory Santos inductions. Eighty holes were to be drilled (stations 1580 to 1659) for the dynamite trial. These were to be 6 metres deep and spaced 10 metres apart, cased with 90mm PVC stormwater pipe and capped. Four additional holes were to be drilled normal to the trial line for a charge size test. The four test holes were drilled first, east of station 1575.5 and spaced 5 metres apart. The easternmost three were air drilled to 6 metres through dry consolidated sand using a 6” Chevron blade bit. The fourth intersected hard sandstone at 4 metres, the last 2 metres being hammer drilled. Thereafter, all holes were drilled using a down-hole hammer and 6” button bit. All production shot holes were drilled to 6 metres except for the northernmost five holes which were drilled to 5.25 metres due to short lengths of casing. All holes intersected hard to very hard buff/white sandstone at depths varying from 4 metres at the southern end of line to less than 0.5 metre at the northern end. Loose unconsolidated sands were generally present for the first 0.25 metres followed by consolidated clay rich sand to the top of the sandstone. On completion of drilling on May 8 the contractor demobilised to Alice Springs the following day.

Drilling production is summarised in the table below.

Date # Holes Drilled 6/05/2011 30 7/05/2011 33 8/05/2011 21

As each hole was cased, drill cuttings and sand was used to fill the void between the casing and hole wall. Overall, drilling operations utilising a top head drive rig are inherently slower than that of its rotary table counterpart due almost entirely to the slower acting hydraulic systems. Raising and lowering of drill stem is slower as is the adding or removal of stem which is stacked in a vertical carousel. Move up time between closely spaced holes is also slow as the longer mast has to be lowered then raised because of its overall weight including the hydraulically operated drive head. Drilling statistics for May 8 are shown below. This day was chosen as up to 5 metres of hard sandstone was encountered in drill holes.

Total charge hours: 8:12 Total non charge hours: 0:54 Total drill time: 7:18 Total holes drilled: 21 Total metres drilled: 122.25 Average time/hole: 21 minutes Average time /metre: 3.6minutes

A more detailed drilling analysis can be found in Appendix 5. It should be noted that this only covers the last two days of drilling production. No records were submitted to Santos for May 6th.

3.7 RECORDING

3.7.1 EQUIPMENT

Terrex Seismic supplied and operated a complete seismic data acquisition system, including, as required. Recording Equipment

1 x Sercel 428A, 24 bit telemetry recording system complete with line interface and 2000 channel acquisition and processing module

1 x Sun Microsystems Sun Blade 2500 server 1 x Dell Optiplex GX620 processor with Windows XP 32 operating system 2 x NAS 320Gb hard drives plus 2 spares 1 x ULTRIUM dual LT02 tape drive 1 x Pelton VibPro encode sweep generator. 4 x Pelton VibPro VCE’s 1 x Pelton VIBSIG real time QC system 4 x Wall mounted, flat LCD colour display screens 1 x Veritas iSys V12 thermal plotter 1 x Optus mobilsat phone 2 x Motorola 50W VHF radios 1 x Uniden 25W UHF radio 1 x Kodan HF radio

450 x strings Sensor SM4, 10Hz geophones, 12/string 220 x cables with 4 combined takeout/A-D converters per cable Sufficient power units and batteries to match cable numbers

Automotive Equipment

1 x Isuzu 4x4 airconditioned recording truck 4 x I/O AHV-IV articulated, hydrostatic 60,000lb vibrators 1 x Paystar 6 x6 vibrator service truck 1x Toyota 4x4 utility – line boss 1x Toyota 4x4 utilities – troubleshooters 2x Toyota 4x4 utilities – cable trucks 1 x Toyota 4x4 utilities – geophone trucks 2x Toyota 4x4 Landcruiser wagons – line crew 1 x Kenworth prime mover – vibrator spare parts 1 x Paystar 6x6 spread truck 1 x Kenworth prime movers - spread

A complete list of automotive equipment is included in Terrex Seismic Operations Report. A copy of this report is attached as Appendix 2.

3.7.2 RECORDING PARAMETERS

Recording parameters are detailed in the Terrex Seismic Operations Report. A copy of this report is attached as Appendix 2.

3.7.3 OPERATIONS

Terrex Seismic recording crew 402 mobilised on May 15, arriving at the Santos Mereenie camp late afternoon. The three vibrators and vibrator service truck that were trucked to site arrived early morning on the 16th. All crew members attended a site specific induction on May 16 before commencing the task of laying out spread. For the trials which were to follow, spread had to be laid over the entire 8.5 kilometres of line (stations 1050 to 1900). With a receiver spacing of 10 metres, this required 851 sets of geophones with each set comprised of 6 elements arrayed parallel to the line and centred on the half station. In addition, between stations 1398 and 1698m, all 6 elements in every third set had to be buried starting with the group at station 1398, the objective being to assess later the effectiveness or otherwise of random noise cancellation.

Five seismic trials and a detonator test were conducted. These are listed below in the order in which they were completed.

• 6 second, 3-100Hz vibroseis sweep length trial, vp’s 1659 - 1580 • 4 second, 3-100Hz vibroseis sweep length trial, vp’s 1580 – 1659 • ‘Cap under’ tests • 5 dynamite charge size trial • 6 second vibroseis production trial, vp’s 1900 – 1660; 1579 - 1050 • Dynamite source trial, stations 1581 – 1659

Vibroseis sweep length trials, cap tests and the charge size comparison trials were all completed on the first day of recording, May 17. The first ninety two vp’s of the six second sweep production data were also recorded. For the sweep length trials, three vibrators were arrayed in line with a pad-pad spacing of 12.5 metres. The middle vibrator was centred on the station. Two sweeps were executed at each station and data recorded by all 851 live geophone groups. Data from the first sweep were correlated and written to tape, the second sweep correlated

then summed with the first and the correlated sum written to tape, thus two files were created for each vp. While vibrators were moving to the start of the production trial, Nedrill Blasting Contractors loaded each of the four holes drilled at station 1575.5 with different weight charges as detailed in the table below.

Hole # Charge Size (grams)

Comments

1 400 Furthest from the production line 2 800 3 1200 4 1600 5 2000 Production station 1580

All loaded holes were tamped to surface prior to detonation. Monitor records (of recorded data) were visually compared and as the best data appeared to be generated by the 800gm charge, all trial shotholes were loaded with a charge of this size. As a separate test, the depth of charge in the shothole at 1655 was decreased to 3 metres. Similarly, a shothole at 1575.5 was reloaded to 3 metres. On completion of the shothole tests, the 6 second vibroseis sweep production trial commenced at station 1900 and at days end, 92 vp’s had been recorded (station 1900 to 1809). The trial continued the following day and ended at vp 1050. It should be noted that vp’s 1659 to 1580 (80 vp’s) were skipped because of time constraints. However, as this vp range formed the entire length of the 6 second sweep trial, data from it would be included during processing of the production trial, thus completing the production line. The dynamite source trial commenced late in the afternoon after waiting an hour for the vibrators to clear the line. All holes were loaded to total depth and tamped to surface. Vehicles were not permitted to drive on the line or have motors running while parked during recording operations. Forty shots were recorded on May 18 and the final 40 on the morning of May 19th, completing the seismic trials. Total time to record the 80 shot points was 2h 53min, an average of 2.16 minutes/shot. The uphole time for every shot was displayed on the Pelton Shot Pro blaster and confirmed on the recording truck firing system. Although all explosive charges were loaded at the same depth the uphole times recorded varied between 6 and 10 milliseconds with the majority registering 8 milliseconds. An anomalous time of 32 milliseconds was recorded at station 1625. Initially, this was thought to result from a poor uphole geophone placement, however, it was more likely to have resulted from an abnormally long detonator delay. There were no misfires or significant blowouts. All cap wire and casing was removed at completion of recording and shotholes backfilled. Spread was picked up and station pegs and pin flags removed. Vibrators and service truck were loaded onto floats and demobilised while the dynamite source trial was in progress. The line crew demobilised on May 20.

3.8 WEATHERING SURVEY

3.8.1 GENERAL

No weathering survey as such was conducted. Uphole times were recorded for the shot holes as discussed in section 3.7 on the previous page.

3.9 ENVIRONMENT

3.9.1 GENERAL

As operator, Santos Ltd has, for a number of years, been committed to planning and conducting seismic operations in such a way that environmental disturbance is avoided or minimised, and affected areas can rehabilitate naturally in a reasonable time frame. These objectives have most recently been set out and discussed in the publications “Statement of Environmental Objectives: Geophysical Operations” Santos Ltd, June 2006, and “Environmental Impact Report: Geophysical Operations” Santos Ltd, June 2006.

The commitment has normally included the distribution of copies of the above to all contractors’ personnel, and continual pressure by Santos Ltd field representatives on these personnel to conform to the principles and requirements of these documents. Compliance with the Aboriginal Heritage Act has also been stressed and, during the year, the strategy to ensure meticulous adherence to standard Santos procedures relating to Cultural Heritage Management and Environmental Sensitivity was reinforced by special training of key personnel, and daily meetings to re-iterate key issues and procedures.

3.9.2 OPERATIONAL OBSERVATIONS This trial was conducted within the producing Mereenie oil and gas field, approximately 280 kilometres west of Alice Springs, in the ‘Western Desert’ region. Terrain is a mix of relatively flat to gently undulating spinifex sand plains and randomly spaced low, rounded, east-northeast orientated sand dunes and intervening swales. These landforms occupy the southern two thirds of the trial line area and support open Mulga and lesser Blue Gum woodlands. Single and small colonies of Desert Oak are fairly common on the sand dunes and associated swales. A pronounced one and a half kilometre wide, east-west trending sandstone ridge is present in the vicinity of the Mereenie West 15 well. Light grey alluvial flats occur at the northern and southern extremities of the line. Both landforms support dense Mulga woodlands. Weather during both stages of this trial was generally fine and mild but mornings and evenings were cold. Prevailing south to southeast winds during Stage I were moderate which helped disperse the fine siliceous dust created during drilling operations. Winds during Stage II were mostly light. There was no rain recorded.

3.9.3 RESTORATION

It should be noted that a portion of this line was recorded over an existing track. In this area, no restoration will be required. The reminder of the line was predominantly a re-shoot of a 1987 seismic line. At the time of completion of recording, it was decided that no immediate restoration was required. At the time of writing this report, nearly 6 months after recoding was completed, indications are that the line is starting to revegetate naturally, despite the lack of follow up rains. Santos will monitor the line over the next few months, particularly after any rains, to ensure that erosion of the prepared line does not become an issue. There is no current evidence of erosion.

APPENDIX 1 – DSS POSITIONING FINAL OPERATIONS REPORT(S)

11042

Final Operations Report

on the

2011 Survey Reinstatement

of the

2009 Mereenie Trial 2D Seismic Surveyfor

Terrex Seismic Pty Ltdand

SANTOS Limited

May 2011

Terrex Seismic Pty Ltd / SANTOS Limited 2011 Mereenie 2D Reinstatement

© Dynamic Satellite Surveys Pty Ltd 2011

This work is copyright. No part may be reproduced by any process without prior written permission

from Dynamic Satellite Surveys Pty Ltd. Requests and inquiries concerning reproduction and rights

should be addressed to:

The Director

Dynamic Satellite Surveys Pty Ltd

PO Box 713

Yeppoon QLD 4703

Telephone: 07 4939 2866

International: +61 7 4939 2866

Facsimile: 07 4939 2867

E-mail: [email protected]

Dynamic Satellite Surveys Pty Ltd has a Quality Management System,

externally certified to AS/NZS ISO 9001:2008 standards by

SAI Global Pty Ltd (Lic# QEC10046).

This project was undertaken for Terrex Seismic Pty Ltd and SANTOS Limited.

The sole purpose of the job was to reinstate a 2D Seismic Line which was originally surveyed in

2009. The use of the data for any other purpose is not authorised.

All data contained in this report and on the attached CD is deemed to be final and overrides any

previous data received from DSS, unless otherwise stated.

Job #11042 - May 2011 - Report Version 0 © Dynamic Satellite Surveys Pty Ltd 2011

Table of Contents

OPERATIONS SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

APPENDICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2009 Mereenie Trial 2D Seismic Survey Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A - 1



1

OPERATIONS SUMMARY

The following report covers the Reinstatement of the 2009 Mereenie Trial 2D Seismic Survey,

performed by Dynamic Satellite Surveys Pty Ltd (DSS) whilst contracted to Terrex Seismic Pty

Ltd (Terrex) for SANTOS Limited (SANTOS).

The Mereenie prospect consisted of one (1) line, AMSN09_01. This line was a total of 8.5

kilometres and was pegged with a station interval of ten metres (10m).

The line was situated within the Mereenie oil field area, located approximately 300 kilometres West

of Alice Springs.

The reinstatement operations were completed between the 3rd and 6th of May 2011. Dirk Smit

(surveyor) travelled to Alice Springs to meet with Terrex Contracting on the 3rd of May. Dirk and

Terrex Contracting mobilised to Mereenie and completed site inductions on the 4th of May.

Dirk supervised the line preparation prior to commencing pegging on AMSN09_01 on the 5th of May.

As all pegs remaining were in poor condition, it was necessary to re-peg the entire line. On the 6th

of May pegging and control operations were completed and Dirk demobilised to Alice Springs.

No further services, other than the line pointing and reinstatement of Line AMSN09_01, were

provided.

DSS reinstated the original stations using the control installed during the original survey. Checks

were made to ensure the integrity of the original network. Consequently, all original operational

aspects were reflected in the 2009 Mereenie Trial 2D Seismic Survey report, attached to this

document as Appendix A.


1


2

APPENDICES


2


2009 Mereenie Trial 2D Seismic Survey Report


A - 1

09066

Final Operations Report

on the

2009 Mereenie Trial 2D Seismic Surveyfor

Terrex Seismic Pty Ltd and

SANTOS Limited

September 2009

Terrex Seismic Pty Ltd / SANTOS Limited 2009 Mereenie 2D Seismic Survey

© Dynamic Satellite Surveys Pty Ltd 2009

This work is copyright. No part may be reproduced by any process without prior written

permission from Dynamic Satellite Surveys Pty Ltd. Requests and inquiries concerning

reproduction and rights should be addressed to:

The Director


PO Box 713

Yeppoon QLD 4703

Telephone: 07 4939 2866

International: +61 7 4939 2866

Facsimile: 07 4939 2867

E-mail: [email protected]

Dynamic Satellite Surveys Pty Ltd has a Quality Management System,

externally certified to AS/NZS ISO 9001:2008 standards by

SAI Global Pty Ltd (Lic# QEC10046).

This project was undertaken for Terrex Seismic Pty Ltd and SANTOS Limited.

The sole purpose of the job was to install and survey 2D Seismic Lines. The use of

the data for any other purpose is not authorised.

All data contained in this report and on the attached CD is deemed to be final and

overrides any previous data received from DSS, unless otherwise stated.

Job #09066 - September 2000 - Report Version 0 © Dynamic Satellite Surveys Pty Ltd 2009

Table of Contents

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

INSTRUMENTATION AND PERSONNEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.1 Personnel and Logistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.2 Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

SURVEY REFERENCE SYSTEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.1 Geodetic Datum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.2 Map Projection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.3 Height Datum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

SURVEY CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

MONUMENTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

METHOD OF SURVEY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6.1 Line Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6.2 GPS Surveying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6.3 Processing and Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

DATA PRESENTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

OPERATIONAL ASPECTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

CONCLUSIONS AND RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

APPENDICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Survey Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A - 1

Project Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B - 1

Line Length Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C - 1

Environmental Monitoring Points (EMPs) . . . . . . . . . . . . . . . . . . . . . . . . . . . D - 1

Photographs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E - 1

Trace Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F - 1



1

INTRODUCTION

The following report covers the 2009 Mereenie Trial 2D Seismic Survey, performed by

Dynamic Satellite Surveys Pty Ltd (DSS) whilst contracted to Terrex Seismic Pty Ltd

(Terrex) for SANTOS Limited (SANTOS).

The Mereenie prospect consisted of one (1) line, AMSN09_01, with a total of 8.5

kilometres, pegged with a station interval of ten metres (10m).

The line was situated within the Mereenie Oil field area, which is some 300 kilometres

West of Alice Springs.

The survey operations were completed between the 25th and 26th of September 2009.


1


2

INSTRUMENTATION AND PERSONNEL

2.1 Personnel and Logistics

DSS personnel involved in the survey were as follows.

Steve Wardle - Bachelor of Surveying (Otago)

- Senior Surveyor

- 1 year seismic experience

Personnel and equipment logistics were supported by the DSS Yeppoon office. Steve

was accommodated at the Mereenie Camp.


2


2.2 Equipment

Equipment provided by DSS and used on this project.

Description Qty

Vehicles Toyota Landcruiser Ute (831-KZM) 1

Communications Telstra Next G Phone 1

Iridium Satellite Phone 1

UHF radio 1

GPS receivers NovAtel GPS receivers with VHF telemetry 2

Computers Dell Inspiron 5150 1

Fujitsu XP tablet 1

HP iPAQ 1

Software Nav05 field software - DSS Ver 4.45

MIB for Windows - DSS Ver 6.58

MapInfo Professional Ver 8.5

GrafNet Ver 7.60

Printer Canon iX4000 1

Miscellaneous Digital Camera 1

Field and Office Consumables


3


3

SURVEY REFERENCE SYSTEMS

3.1 Geodetic Datum

This project was based on the Geocentric Datum of Australia 1994 (GDA94), which is

based on the Geodetic Reference System 1980 (GRS80) model defined by the following

parameters:

Datum: GDA94 (Geocentric Datum of Australia 1994)

Spheroid: GRS80

Reference Frame: ITRF92 (International Terrestrial Reference Frame)

Semi-Major Axis Length: 6 378 137.0

Inverse Flattening: 298.257222101

The Unit of Measure: International Metre


4


3.2 Map Projection

Final rectangular coordinates were based on the Map Grid of Australia 1994 (MGA94).

Parameters for this projection are as follows:

Projection: Universal Transverse Mercator (MGA Zone 52)

Latitude of Origin: 0

Central Meridian (CM): 129 E

Scale Factor at CM: 0.9996

False Easting: 500 000

False Northing: 10 000 000

The Unit of Measure: International Metre

3.3 Height Datum

All elevations obtained relative to GDA94 have been reduced to the Australian Height

Datum (AHD) using the AUSGeoid98 Geoid - Spheroid separation model to determine

the separation (N) for the particular area.

GPS observations are made on the GDA94 datum. The height associated with this

datum is an ellipsoidal height (h). The Australian Height Datum (AHD), the height datum

associated with MGA94, is an orthometric height, which is measured as the height above

mean sea level, or the geoid (H).

The function that defines the relationship between the ellipsoid and orthometric heights

is:

H = h - N

Or

AHD = GDA94 - (Geoid / Ellipsoid Separation)

The value for the geoid/spheroid separation is interpolated from a national model called

AUSGeoid98.


5


AUSGeoid98 is the third in a series of national geoid models produced for Australia by

the Australian Surveying and Land Information Group (AUSLIG). The geoid-ellipsoid

data is prepared for the Australian region from:

- EGM96 Global Geopotential Model;

- 1996 Australian Gravity DataBase, from the Australian Geological Survey

Organisation (AGSO);

- AUSLIG / AGSO GEODATA nine-second digital elevation model;

- Satellite altimeter - derived free air gravity anomalies offshore;

- Theories, techniques and software developed by Associate Professor Will

Featherstone, Curtin University of Technology1.

AUSGeoid98 N values were interpolated using the GrafNet Version 7.60 software,

distributed by Waypoint Consulting Inc.

1Johnston, G.M., Featherstone, W.E. (1998) AUSGeoid98: A New Gravimetric Model for Australia


6


4

SURVEY CONTROL

Survey control was established by surveying onto existing survey control provided by

SANTOS. The adopted datum station is:

Line Station Easting Northing AHD

AMSN09_01 BMWM15A 748695.619 7348217.900 763.901

All station information and control checks are listed in Appendix A - Survey Control.


7


5

MONUMENTATION

Line AMSN09_01 was pegged at ten (10) metre intervals.

All marks were wooden pegs. Every second peg was numbered on each side.

Permanent Markers were used for all GPS base stations. These consisted of a star

picket with associated tag stating Client, DSS Job Number and the unique Base ID.

Another star picket was placed at the base of the larger star picket to mark where the

station was surveyed.

Four (4) Environmental Monitoring Points (EMPs) were placed throughout the project.

These consist of a star picket with associated tag.

Permanent Markers were placed at the start and end of the Line. These consisted of a

star picket with associated tag.


8


6

METHOD OF SURVEY

6.1 Line Preparation

DSS prepared the GPS unit for the line clearing operation on the first afternoon

immediately after mobilising onto site. The TC operators were familiar with the GPS

system used, and therefore had no problems clearing along the correct path. The line

followed a previous line (1987) and the clearing was completed very quickly.

Environmental Monitoring Points (EMPs) were established along the line at

predetermined positions prior to the dozer clearing the line.

The dozer was able to walk over most of the terrain with its blade up to minimise

environmental impact. This was a specific requirement of the Department of Natural

Resources, Environment, The Arts and Sport. There was no need for a grader to tidy

up the line after dozing.


9


6.2 GPS Surveying

There are three modes of use in GPS surveying; static, kinematic and real-time

kinematic. On assessment, it was decided a real-time kinematic survey would best

enable position and elevation co-ordinates to be acquired in real-time and on the

appropriate datum. The survey was completed using DSS’ OEM4 real-time kinematic

(RTK) surveying technique.

NovAtel real-time kinematic methods can achieve accuracies of better than +/-0.05m in

position and elevation, depending on base line length. The expected precision for

locating pegged positions is better than 0.3 metres and is generally better than 0.2

metres.

Initialisation of the OEMV-3 rover GPS usually takes as little as one minute, although this

is greatly dependant on satellite geometry, availability, and base line length.


10


6.3 Processing and Quality Control

All survey data was immediately recorded internally on the Fujitsu XP Tablets and

subsequently downloaded to the office computer each evening.

Quality of the satellite data was monitored by careful examination of the various on-

screen quality control statistics produced by the Nav05 software. These checks on data

integrity are in the form of standard deviation (or sigma) values for Easting, Northing and

Height and are generally better than 0.05 metres.

Any recording of positions where the standard deviation values exceeded 0.1 m was

highlighted to the surveyor at the time of recording. Following this, it was possible to re-

initialise the GPS in order to obtain a more accurate solution. Any recorded position

falling outside the required tolerances are flagged for further investigation and re-

recording if necessary.

Numerous checks on pre-recorded marks were observed during each days survey in

order to confirm the integrity of the GPS base receiver and the placed markers.

Coordinates were also checked in the office by determining point to point direction and

distance. Profile plots were examined in detail to identify any height anomalies. Any

points showing unusual position or height details were flagged and checked in the field.


11


7

DATA PRESENTATION

All line files were checked and finalised before the survey crew demobilised from the

prospect.

All final data was in UTM grid coordinate format on the MGA94 datum on the GRS80

reference spheroid. All elevations were on the Australian Height Datum (AHD71).

Final data produced were:

EMPs

*.PDF - diagram of each EMP placed

EMPs.txt - text file of EMP locations

GoogleEarth

*.kmz - Google Earth file of final line location

Photos

*.JPG - project photographs

Survey Data

*.SEG - text files of all line data in SEGP1 format

*.UKA text files of all line data in UKOOA format

Trace Diagrams - PDF files for each line.

All files are backed up on digital disks in the Yeppoon office for future reference.

No hard copy data were provided.


12


8

SAFETY

DSS personnel are aware of safety conditions concerning all exploration seismic surveys.

The DSS “Quality Policy Statement” and “Health, Safety and Environment Policy”

were adhered to at all times.

DSS received copies of Santos’ TSS (18-09-2009) and the Santos Induction Manual for

Mereenie Field (17-09-2009). A copy of the Best Practice Seismic Survey Guide (25-

102007) was also used as an aid in line preparation.

Each vehicle was fitted with a phone (NextG or Satellite), UHF radio, shovel, first-aid kit,

dry powder and water fire extinguishers, vehicle recovery equipment, rotating beacon

and weekly vehicle maintenance check lists.

Staying in contact with the Terrex Contracting Crew whilst mobilising to site was also

enforced and we made a point of enforcing journey management by calling ahead to the

SANTOS site office prior to leaving Alice Springs, and calling the site office upon arrival

back in Alice Springs after finishing the job.

There were no safety issues on this job.


13


9

OPERATIONAL ASPECTS

Upon arriving at the Mereenie Oil Field on the 24th September, an Induction for DSS and

Terrex Contracting personnel was carried out. This involved a brief SANTOS induction

and a longer Department of Natural Resources, Environment, The Arts and Sport

Induction, which focussed on the environmental impact of seismic lines.

Once this was complete, we were taken to the line. Well Site WM15 and the associated

pipeline crossing were pointed out.

The dozer was loaded with a Garmin GPS and the data checked on the line.

The next day four EMP points were established and line pegging commenced. Three

PM’s from previous seismic surveys were located and surveyed to ensure the

coordinates of these previous surveys were in terms of this survey.

Line pegging was completed on the 26th September.

At the time of survey, it was not certain which direction the line would be shot. Because

of this, two trace diagrams were provided. One trace diagram was produced heading

North, while the second alternative diagram headed South.

Steve demobilised from Mereenie on the 27th September to Alice Springs.


14


10

CONCLUSIONS AND RECOMMENDATIONS

This was a very straightforward survey, with good cooperation from all SANTOS and

Terrex Contracting staff.

The accommodation and facilities at Mereenie were superb.

Signed,


Steve WardleSenior Surveyor

Checked and edited by:

Denis WilliamsSurvey Support Manager


15


11

APPENDICES


16


Survey Control


A - 1


Coordinates are Map Grid of Australia (MGA94) Zone 52

Elevations are AHD71 using AUSGeoid98 N Value Model

Adopted Datum Station

Line Station Easting Northing AHD

AMSN09-01 BM WM15A 748695.62 7348217.93 763.90

Mereenie New DSS Control Station

NAME EASTING NORTHING HEIGHT

SAN01 748697.09 7348359.24 769.75

Mereenie New Permanent Markers

Station Easting Northing AHD Comments

1050 747388.98 7342033.08 722.09 SOL

1900 749122.89 7350354.60 745.24 EOL

Ties to Existing Permanent Marks

Line Station Easting Northing AHD Comments

AMSN09_01 1211+7 747717.92 7343617.00 723.79 M87-09 SOL

AMSN09_01 1511+4 748323.86 7346551.76 736.47 M87-9, M83-3

AMSN09_01 1624+2 748557.13 7347654.80 750.76 M87-9, M82-11


A - 2


Project Map


B - 1

No Window

Scale

Drawn

File

Job#

1 : 50000 (A4)

DW

09066 Map

09066

Date 15-10-2009

The purpose of this map is to represent the surveyeddigital data in a pictorial manner only. The accuracyof the underlying topographic image in no way relatesto the accuracy of the surveyed digital data. Features

on the topographic map have not necessarily beensurveyed by DSS. Any use of this map for reasons other

than the purpose for which it was created is not authorised.

Dynamic Satellite Surveys Pty Ltd 1800 060 407

Terrex Seismic Pty LtdSantos Limited

Mereenie 2D Trial Seismic SurveyLine AMSN09-01

13ST2

139

76

115

15

4

18

WEST MEREENIE 1

(((((((((((((((((((((

(((((((((((((((((((((((((((((((((((

((((((((((((((((((((((((((((((((((

((((((((((((

((((((((((((

(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((

(((((((((((

(((((((((((

((((((((((((((((((((((((((((((((((

(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((

((((((((((((

(((((((((((

(((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((

((((((((((((

((((((((((((((((((((((((((((((((((

(((((((((((

((((((((((((((((((((((((((((((((((

(((((((((((((((((((((((((((((((((((

((((((((((((

((((((((((((((((((((((((((((((((((

(((((((((((((((((((((((((((((((((((

((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((

((((((((((((((((((((((((((((((((((((((((((((((((((((((((((

((((((((((((

f

f

f

f

f

f

f

BMWM15ABMWM15

09066 EMP2

09066 EMP3

09066 EMP1

09066 EMP4

SAN01

1050 SOL

1900 EOL

(

f

Survey Control Stations

Surveyed Points AMSN09-01

EMPS


Line Length Summary


C - 1


Line Length Summary

Mereenie 2D Seismic Survey

Station Interval = 10m

Line Name Start End Distance (km)

AMSN09-01 1050 1900 8.50

TOTAL 8.50


C - 2


Environmental Monitoring Points (EMPs)


D - 1


Coordinates are Map Grid of Australia (MGA94) Zone 52

Elevations are AHD71 using AUSGeoid98 N Value Model

EMPs

EMP # Easting Northing AHD Station

09066 EMP1 748628.66 7348007.15 743.32 1660

09066 EMP2 748473.82 7347218.41 758.25 1580

09066 EMP3 748105.57 7345458.23 723.24 1400

09066 EMP4 747693.49 7343502.12 724.67 1200


D - 2

EMP/ERF LOCATION DIAGRAM

PROJECT / JOB # CLIENT DAY / DATE

NAME:

AREA:

Grid Coordinates

Easting:

Northing:

Zone:

Mark Description:

Geographical Coordinates

Latitude:

Longitude:

Datum:

MAP REFERENCE :

DSS-FF-36

REV 1.0

June 2008

Datum:

Photograph looking North at station. Photograph looking South at station.

O ‘ “

O ‘ “

GDA94

748628.66

MGA94

7348007.15

-23 57 37.34

131 26 35.57

52

Station is located at Station 1660 on line AMSN09-01 and is surrounded bysmall trees and grasses

Mereenie - NT

EMP01 (Tagged AMSN09-01 EMP01)

09066 Terrex / SANTOS Sept 2009



NAME:

AREA:

Grid Coordinates

Easting:

Northing:

Zone:

Mark Description:


Latitude:

Longitude:

Datum:

MAP REFERENCE :

DSS-FF-36

REV 1.0

June 2008

Datum:


O ‘ “

O ‘ “

GDA94

748473.82

MGA94

7347218.41 131 26 30.57

-23 58 03.05

52

Station is located at Station 1580 on line AMSN09-01 and is surroundedby small trees and grasses.

Mereenie - NT





NAME:

AREA:

Grid Coordinates

Easting:

Northing:

Zone:

Mark Description:


Latitude:

Longitude:

Datum:

MAP REFERENCE :

DSS-FF-36

REV 1.0

June 2008

Datum:


O ‘ “

O ‘ “

GDA94

748105.57

MGA94

7345458.23 131 26 18.63

52


Mereenie - NT



-23 59 00.44



NAME:

AREA:

Grid Coordinates

Easting:

Northing:

Zone:

Mark Description:


Latitude:

Longitude:

Datum:

MAP REFERENCE :

DSS-FF-36

REV 1.0

June 2008

Datum:


O ‘ “

O ‘ “

GDA94

747693.49

MGA94

7343502.12 131 26 05.26

52


Mereenie - NT



-24 00 04.22


Photographs


E - 1


Pegging on Line AMSN09-01.

Well-cleared seismic Line AMSN09-01.


E - 2



F - 1

AndreaJ

TextBox

TRACE DIAGRAMS

PROJECT/JOB # CLIENT

PAGE OF AREA:

FROM STN TO STN SHOOTING DIRECTION: BEARING:o

SHOT INTERVAL: mSTN INTERVAL: m

09066 Santos/ Terrex Seismic

1 Mereenie Trial 2D 10

South to North19001050

1

TRACE DIAGRAMDSS-FF-07

REV 10.0

Feb 2009LINE: AMSN09-01

1050 SOL marked with PM

Dunes

1338

1330

Dunes

1372

1366

Dunes

1420

1408

Dunes

1450

1430

1668

1674Rocks

2 Well2 Well platform

1679

1682

Steep uphill heading North

1682

1688

Pipeline

1732

1733

No Vibe 1729- 1735 Inclusive

1869 Dip on track

1900 EOL marked with PM

1200 EMP#4

1400 EMP#3

1580 EMP#2

1660 EMP#1

PM

PM

PM

PM

PM

PM

PROJECT/JOB # CLIENT

PAGE OF AREA:

FROM STN TO STN SHOOTING DIRECTION: BEARING:o

SHOT INTERVAL: mSTN INTERVAL: m

09066 Santos/ Terrex Seismic

1 Mereenie Trial 2D 10

North to South10501900

1

TRACE DIAGRAMDSS-FF-07

REV 10.0

Feb 2009LINE: AMSN09-01

1050 EOL marked with PM

Dunes

1338

1330

1200 EMP#4

1400 EMP#3

1580 EMP#2

1660 EMP#1

Dunes

1372

1366

Dunes

1420

1408

Dunes

1450

1430

1668

1674

Rocks

2 Well2 Well platform

1679

1682

Steep downhill heading South

1682

1688

Pipeline1732

1733

No Vibe 1735- 1729 Inclusive

1869 Dip on track

1900 SOL marked with PMPM

PM

PM

PM

PM

PM

APPENDIX 2 – TERREX SEISMIC FINAL OPERATIONS REPORT

MEREENIE 2D SEISMIC SURVEY TRIAL OL4 (SANTOS)

EP 115 (CENTRAL PETROLEUM)

CLIENT: SANTOS LTD

May 2011

PERTH OFFICE

L4 76 Kings Park Rd, West Perth WA 6005

T | 08 9235 4600

F | 08 9324 3640

BANYO OFFICE

22 Crockford Street, Banyo QLD 4014

T | 07 3621 0306

F | 07 3266 7345

OPERATIONS REPORT

FOR

SANTOS LTD

MEREENIE

2D SEISMIC SURVEY TRIAL

BY

DAVID KEAT

CREW # 402

SANTOS LTD MEREENIE 2D SEISMIC SURVEY TRIAL – MAY 2011 - FINAL REPORT

Page | i of i

Table of Contents PAGE

1. Introduction .....................................................................................................................................1

1.1 Geographic Area ........................................................................................................................................ 1

1.2 Climatic Conditions ................................................................................................................................... 1

1.3 Logistics ..................................................................................................................................................... 2

2. Surveying ...........................................................................................................................................3

2.1 Ranging/Chaining/Surveying ..................................................................................................................... 3

2.2 Line Clearing .............................................................................................................................................. 3

2.3 Permitting .................................................................................................................................................. 3

2.4 Shot Hole Drilling ....................................................................................................................................... 3

2.5 Explosives .................................................................................................................................................. 3

3. Recording/Processing ..................................................................................................................4

3.1 General Survey Details .............................................................................................................................. 4

3.2 Recording Parameters ............................................................................................................................... 4

3.3 Mereenie 2D Map ..................................................................................................................................... 6

3.4 Recording .................................................................................................................................................. 7

3.5 Processing ................................................................................................................................................. 8

List of Appendices

Appendix A - Equipment Specifications .............................................................................................................................. 9

Appendix B – Vehicle Equipment List ............................................................................................................................... 11

Appendix C – Tape Listings ............................................................................................................................................... 12

Appendix D - HSE Policy & OH&S Standards ..................................................................................................................... 13

Appendix E – End of Contract HSE .................................................................................................................................... 14

Appendix F – Personnel Crew List ..................................................................................................................................... 15

Appendix G – Daily Reports .............................................................................................................................................. 16

Appendix H – Recording Statistics .................................................................................................................................... 21

List of Photographs

Photograph 1 – Some of the local wildlife .......................................................................................................................... 1

Photograph 2 – Accommodation Facilities at Mereenie Camp .......................................................................................... 2

Photograph 3 – Recorder Truck .......................................................................................................................................... 3

Photograph 4 – Explosive Shot Point .................................................................................................................................. 7

Photograph 5 – Retrieving spread and loading the spread trailer...................................................................................... 8

Photograph 6 – Loading Cable ............................................................................................................................................ 8

Photograph 7 - Vibrating .................................................................................................................................................. 10


Page | 1 of 21

1. INTRODUCTION

Terrex Seismic was contracted by Santos to conduct the Mereenie 2D Seismic Survey Trial.

Recording commenced on the 17th May 2011 and was completed on the 19th May 2011.

1.1 GEOGRAPHIC AREA

The Mereenie 2D Trial is located in the Mereenie Oil and Gas field in the Western Desert region of the NT. Access to the area from Alice Springs is via the Mereenie loop road and internal tracks within the Mereenie field. Alice Springs to Mereenie travel time is approx 3 ½ hours.

Photograph 1 – Some of the local wildlife

1.2 CLIMATIC CONDITIONS

The weather was cool and mild throughout the program, and minimal cloud cover. No recording days were lost due to rain.


Page | 2 of 21

1.3 LOGISTICS

The crew mobilized on the 15th May 2011 from the Arckaringa Basin SA off the Oodnadatta Track, Mobe completed in one day with no break downs or down time. The crew arrived at Mereenie Oil field NT late afternoon.

The accommodation facilities were provided by Santos at the Mereenie base camp and were single and double cabins.

All meals were provided by Spotless at the Mereenie base camp.

Fuel for all vehicles was supplied by Terrex Seismic from our service truck

Photograph 2 – Accommodation Facilities at Mereenie Camp


Page | 3 of 21

2. SURVEYING

2.1 RANGING/CHAINING/SURVEYING

Line chaining and survey for the entire program was completed by Dynamic Satellite Survey personnel from Yeppoon Queensland.

2.2 LINE CLEARING

All line clearing was performed by Santos.

2.3 PERMITTING

Permitting was carried out by the client with John Allen acting as the client representative until completion of the survey.

2.4 SHOT HOLE DRILLING

Shot hole drilling services were carried out by Gory and Cole Drilling of Alice Springs.

2.5 EXPLOSIVES

The supply of explosives, blast equipment and licensed personnel was provided by Nedrill.

Photograph 3 – Recorder Truck


Page | 4 of 21

3. RECORDING/PROCESSING

3.1 GENERAL SURVEY DETAILS

Survey 2011 Mereenie 2D Seismic Survey Trial - OL4, EP115

Lines AMSN09-01

Areas Mereenie NT

3.2 RECORDING PARAMETERS

Instruments Sercel 428 XL

No. Channels 851 stations total centred on half station as pegged

All 851 active consisting of the following:

Stns 1900-1700 = 200 stations surface phones (6/str)

Stns 1699-1400 = 200 stations surface phones (6/str) and

100 stations of buried phones (6/str) in a 1 buried,

2 surface, 1 buried, 2 surface, repeating configuration

Stns 1399-1050 = 350 stations surface phones (6/str)

Tape Drives IBM Ultrium LT02 (dual drive – 200 Gbyte per tape)

Tape Format SEGD Revision 1 8058IEEE Demultiplexed Noise edited correlated summed

Filters Hi cut 200 Hz, (0.8 Nyquist - Linear) Lo cut: Out

Sample Rate 2 ms

Record Length 3 sec (6 sec sweep)

RTC Yes

Correlation Type Zero Phase, After Sum

Stack Diversity stack


Page | 5 of 21

Source Data

Vibrators 3 x I/O AHV IV’s on 4x4 Buggies

Electronics Pelton VibPro

Sweep Frequency Linear Upsweep, 3-100 Hz

Sweep Length 6 seconds

No. Sweeps 2 standing

VP Interval 10m

Vibrator Array 3 vibes in line, 12.5m pad to pad standing. No move-up.

Sweep Amplitude Taper 100% (none)

Drive Level 80% varied by amplitude control function

End Tapers (cosine) 0.2s

Phase Locking Type Ground Force using M51 HP accelerometers

Amplitude Control Peak to Peak

Receivers

Receiver Group Interval 10m

Number of line traces 851

Geophones Sensor SM24 10 Hz

Array 6 phones in-line, centred on half station, 1.67m spacing


Page | 6 of 21

3.3 MEREENIE 2D MAP


Page | 7 of 21

3.4 RECORDING

The Mereenie 2D is located in the Mereenie Oil and Gas field approx 3½ hours Southwest of Alice Springs NT. Consisting of 1 line total of 8.50 km’s with recording commencing on the 17th May 2011 with production completed 3 days later on the 19th May 2011.

LINE AMSN09-01

On the 17th May 2011 the crew commenced parameter testing and experimental dynamite shots, 80 VP’s were recorded from station 1580-1659 with two 6 second correlated un-summed sweeps with a range of 3 – 100 Hz, the same 80 VP’s were then recorded with two 4 second correlated un-summed sweeps in the same frequency range.

Five dynamite trial holes were also recorded at station 1575.5; five different charge sizes were tested all at a depth of six meters, 400 grams, 800 grams, 1200 grams, 1600 grams and 2000 grams. Vibrator production commenced late that day recording with two 6 second correlated un-summed sweeps of 3 – 100Hz.

On the 18th May 2011 the crew continued and completed Vibrator production on AMSN09-01 with 14 skipped VP’s due to a pipeline. 39 dynamite shots of 800 grams at six meters depth were also recorded from stations 1581 – 1619 with one test shot of 800 grams at 3 meters depth taken at station 1575.5.

19th May 2011 the crew continued and completed explosive production from stations 1620 – 1659, then picked up the equipment and cleaned all debris from the shot holes. The crew demobilized from site the following day on the 20th May, contract completed.

Photograph 4 – Explosive Shot Point


Page | 8 of 21

Photograph 5 – Retrieving spread and loading the spread trailer

Photograph 6 – Loading Cable

3.5 PROCESSING

“A” & “B” tapes were sent to the following location:

Santos Ltd Operations Geophysics Basement, 191 Pultney st Adelaide SA, 5000 ATTN - Nic Papanicolaou


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APPENDIX A - EQUIPMENT SPECIFICATIONS

SEISMIC ACQUISITION CREW - EQUIPMENT

RECORDING EQUIPMENT, SOURCE EQUIPMENT

RECORDING EQUIPMENT (2D Surveys)

SERCEL 428 Seismic Data Acquisition System

Three (4) 19inch Flat Screens with Sun Blade Computer

Veritas V12 Plotter, UPS, LIM, APM

Two (2) LTO High Density Tape Drives

Two Hundred and Twenty Five Seismic Cables with 4 x FDU’s per cable (900 Channels)

Power Harness Leads

Line Batteries

Transverse Cables

Repeaters

LAUX’s

LAUL’s

Telwin (Nevaboost 140) Battery Chargers

Pelton Real Time Similarity System

One (1) 10 metre 6 DB Boost High Gain Antenna on Recording Truck

Sensor SM4 10Hz High Specification Super phones

Eight Hundred & Fifty (850) Geophone strings with 6 ph/group

Note: Terrex Seismic warrants that 90% of equipment will be used in field and up to 10% may be undergoing repair and maintenance.

SOURCE EQUIPMENT

Three (3) Input-Output AVH IV 4x4 Buggy Vibrators:

Peak force is 62000lbs per Vibe and Hold-Down weight is 62400lbs per Vibe

Three (3) Pelton VibPro Vibrator Control Electronics

One (1) Pelton VibPro Encoder Sweep Generator for Recorder

Three (3) operating Online

Electronics are capable of Trade Marked Varisweep


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Photograph 7 - Vibrating


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APPENDIX B – VEHICLE EQUIPMENT LIST

# VEHICLE REGISTRATION

1 76 Series Landcruiser Wagon 459-LGW



4 76 Series Landcruiser Wagon 1CVW-536

5 Landcruiser Trayback 470-LGW






11 Landcruiser Troopy 477-LGW

12 Iveco + Spread Trailer 1DDE-230/092-QIR

13 Recorder Unit 1BSB-131

14 1 X IO AHV IV 4X4 Buggy’s




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APPENDIX C – TAPE LISTINGS


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APPENDIX D - HSE POLICY & OH&S STANDARDS

Crew startup induction / toolbox / safety meetings

Sunday crew safety meeting

Weekly Section head meetings

Long sleeve shirts, covered footwear must be worn by field crew at all times

Sunscreen, broad brimmed hat, sunglasses

Reflective vests for all recording personnel working along roads

Satellite Phone / VHF / UHF radios in recorder

Functional VHF Radios fitted in all line vehicles

Random drug and alcohol tests

Vehicles fitted with First Aid & Snake Bite kits

Road Signs

Gloves to protect hands


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APPENDIX E – END OF CONTRACT HSE


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APPENDIX F – PERSONNEL CREW LIST

# PERSONNEL POSITION

1 David Keat Crew Manager

2 Tony Morley Hse Advisor

3 Stuart Rauckman Vibe Tech

4 Nik Helme Observer

5 Nelson Castillo Observer

6 Steven Geisler Line Boss

7 Anthony Davidson Vibe Op

8 Luke Samios Vibe Op

9 Darrin Johnstone Vibe Op

10 Floyd Dyball Trouble Shooter

11 Brenton Amor Line Crew

12 Karan Gupta Line Crew

13 Kim Gibson Line Crew

14 Luke Hiscox Line Crew

15 Craig Jason Line Crew

16 Paul Jensen Line Crew

17 Shawn Laing Line Crew

18 Rangi Mace Line Crew

19 Neil Mcgill Line Crew

20 Tai Taimani Line Crew

21 Brenton Pearce Line Crew

22 Kara Pearce Line Crew


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APPENDIX G – DAILY REPORTS


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APPENDIX H – RECORDING STATISTICS

APPENDIX 3 - RECORDING PRODUCTION STATISTICS


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APPENDIX H – RECORDING STATISTICS

APPENDIX 4 - PERSONNEL LIST

APPENDIX 4 PERSONNEL LIST

(Total Crew involved in project)

Terrex Seismic

Crew Manager (1) QHSE Officer (1) Observers (2) Vibrator Operators (3) Vibrator Technician (1) Line Boss (1) Trouble Shooter (1) Line Crew (12)

Dynamic Satellite Surveys (both 2009 & 2011) Surveyor (1) 2009

Terrex Contracting (both 2009 & 2011)

Bulldozer Operators (1) Bulldozer Offsider (1)

Gorey & Cole Drilling

Driller (1) Drillers Offsider (2)

Nedrill & Blast Pty

Shooter (2)

APPENDIX 5 – DRILLING PRODUCTION

MEREENIE 2D TRIAL DAILY DRILLING PRODUCTION

CONTRACTOR: Gory & Cole DATE: 07/05/2011

Hole No. Time Rig Up Time Rig Down Move Up (min) Elapsed Time (min) Station No COMMENTS

1 07:10 07:21 - 11 1606 2 07:27 07:43 6 16 1607 3 07:47 08:01 4 14 1608 2m sand, 4m white, hard, vfg s/stone 4 08:05 08:18 4 13 1609 as above 5 08:21 08:36 3 15 1610 as above 6 08:39 08:56 3 17 1611 as above 7 09:00 09:12 4 12 1612 as above 8 09:15 0926 3 11 1613 as above 9 09:30 09:37 4 7 1614 2m sand, 4m mod hard s/stone 10 09:41 09:53 4 12 1615 3m sand, 3m white, hard, vfg s/stone 11 09:56 10:05 3 9 1616 as above 12 10:12 10:18 7 6 1617 3m sand, 3m weathrd mod hard s/stone 13 10:21 10:31 3 10 1618 as above 14 10:35 10:47 4 12 1619 as above 15 10:51 11:02 4 11 1620 as above 16 11:07 11:20 5 13 1621 as above 17 11:23 11:30 3 7 1622 as above 18 11:33 11:47 3 14 1623 as above 19 11:50 12:06 3 16 (refuel) 1624 as above 20 12:09 12:52 (lunch) 3 - 12:52 13:09 17 1625 as above 21 13:12 13:25 3 13 1626 as above 22 13:28 13:43 3 15 1627 as above 23 13:46 14:04 3 18 1628 2m sand, 4m white, hard, vfg s/stone 24 14: 07 14:25 3 18 1629 as above 25 14:28 14:46 3 18 1630 as above 26 14:53 15:03 7 (move w/truck) 10 1631 3m sand, 2m weathrd s/stone, 1m hard, vfg s/stone 27 15:06 15:23 3 17 1632 2m sand, 4m white, hard, vfg s/stone 28 15:27 15:38 4 11 1633 2m sand, 4m buff/lt brn mod hard s/stone 29 15:40 16:00 2 20 1634 2m sand. 4m white, hard, vfg s/stone 30 16:03 16:22 3 19 1635 as above 31 16:25 16:45 3 20 1636 as above 32 16:48 17:07 3 19 1637 as above 33 17:11 17:19 4 8 1638 4.5m clayey sand, 1.5m white, hard s/stone

MERRENIE 2D TRIAL DAILY DRILLING PRODUCTION

CONTRACTOR: Gory & Cole DATE: 08/05/2011

Hole No. Time Rig Up Time Rig Down Move Up (min) Elapsed Time (min) Station No COMMENTS

1 07:30 07:44 - 14 1639 4m sand, 2m white, hard s/stone 2 07:50 08:09 6 19 1640 3m sand, 3m white, hard s/stone 3 08:12 08:29 3 17 1641 1m sand, 5m buff, hard, vfg s/stone 4 08:32 08:47 3 15 1642 2m sand, 4m buff/white hard, vfg s/stone 5 08:50 09:02 3 12 1643 3m sand, 3m white, hard s/stone 6 09:05 - 1644 1m sand; 5m white, hard s/stone 7 1645 8 1646 9 1647 10 1648 11 - 11:04 1649 12 11:07 11:20 3 13 1650 3m sand, 3m buff weathrd s/stone 13 11:25 11:44 5 19 1651 3.5m sand, 2.5m white, hard, vfg s/stone 14 11:44 12:25 (refuel/lunch) - - 12:25 12:42 - 17 1652 4m sand, 2m white, hard s/stone 15 12:45 13:06 3 21(clean hole) 1653 3.5m sand, 2.5m white, hard s/stone 16 13:09 13:23 (clean air filters) 3 - 13:23 13:38 - 15 1654 17 13:41 14:05 3 24 1655 Depth 5.25m. 3.5m hard white s/stone 18 14:08 14:26 3 18 1656 Depth 5.25m. 4m hard white s/stone 19 14:29 14:42 3 13 1657 Depth 5.25m. 4m hard white s/stone 20 14:45 15:09 3 24 1658 Depth 5.25m. 5m hard white s/stone 21 15:12 15:28 (clean air filters) 3 - 15:28 15:42 - 14 1659 Depth5.25m. 5m hard white s/stone Note: A wind shift to the south/southwest around midday caused the fine white silica drilling dust to slowly clog the compressors air inlet filters (2). This resulted in a

reduction of air volume and pressure to the downhole hammer which in turn reduced the drill penetration rate.

APPENDIX 6 - TAPE LIST

Tape listing for 2009/2011 Mereenie 2D Seismic Survey

Field Tapes

TAPE NO’S TAPE NO’S TAPE NO’S TAPE NO’S TAPE NO’S

1101A 1101B IMS Tapes OBS/SPS (Observers logs and SPS data)

OBS LOGS Archive Tapes 2 Field tapes 1 Obs/SPS CD 0 Archive DVD’s

APPENDIX 7 - MAPS

AMSN09 SEISMIC SURVEY OL 4 & EP 115 NORTHERN …

Documents

Transcript of AMSN09 SEISMIC SURVEY OL 4 & EP 115 NORTHERN …