11

Oil Search Profile

Established in Papua New Guinea (PNG) in 1929

Operates all of PNG’s producing oil and gas fields. Current gross production ~33,500 boepd, net share ~18,500 boepd

At December 2011, proven reserves were 330 mmboe, proven and probable 553 mmboe plus 318 mmboe 2C resources, taking 2P reserves and 2C resources to 870 mmboe

PNG Government is largest shareholder with 15%. In early 2009, Govt issued exchangeable bonds over shares to IPIC of Abu Dhabi

29% interest in PNG LNG Project, world scale LNG project operated by ExxonMobil. Project in construction, first LNG sales expected 2014

Exploration interests in PNG and Middle East/North Africa

Market capitalisation ~US$9 billion. Listed on ASX (Share Code OSH) and POMSOX, plus ADR programme (Share Code OISHY)

2

Key Oil and Gas Fields, PNG

Kumul Terminal

Port Moresby

PorgoraGold Mine

7°S

Juha Hides

Moran

Agogo

Mananda 5

Proposed JuhaFacility

PRL08

PRL11

PDL7

PDL1

PRL02

PDL2

PDL4PDL3

PRL09

PDL6

PDL5

PRL14

260

233

PDL9PDL8

233

LNG Facility

Kutubu

Moro Airport

Flinders

6°S

8°S

PRL01

PPL234

PRL10

PPL244

Kiunga

Kundiawa

Mt. Hagan

Mendi

Kerema

Trapia

Barikewa

Pandora

SE Mananda

Uramu

P’nyang

Madang

Daru

Wabag

HidesConditioning Plant

& Komo Airstrip

Gobe/SE Gobe

PPL276

PPL338

338

338

338

PPL339

339

339

339

PPL339

339

PPL312 339 339

PPL260

Lae

145°E 146°E144°E143°E 147°E

Kimu

PRL3

APPL385

Kopi ScraperStation

142°E

Kopi Wharf

PPL219

100km PNG LNG ProjectNew Facilities

PNG LNG ProjectGas Resources

Non PNG LNG Gas Resources

ExplorationGas Resources

Angore

Elk/Antelope

PPL277

Oil Field

Gas Field

Prospect

Oil Pipeline

Proposed Gas Pipeline

OSH Facility

LNG Facility

Major Road

Goroka

Significant Growth Phase Underway

Oil Search has been a top quartile performer for past six years

Significant growth opportunities have been identified, capable of driving future value

Largest ever development, appraisal and exploration programme now underway:

PNG LNG T1 & 2 construction more than half complete

PNG Highlands resource base being evaluated

Gulf area potential to be assessed through drilling programme

Material oil prospects in Middle East to be drilled

Series of catalysts over next 18 months, with drilling results being progressively delivered

Activities supported by steady production, strong cash flows and healthy balance sheet

4

Focus on Safety

5

Total Recordable Injury Frequency Rate of 1.85 in 2011TR

I /

1,0

00

,00

0 H

ou

rs

Oil Search

Australian Companies (APPEA)

InternationalCompanies

(OGP)

6

PNG LNG T1/2

PNG LNG Project Overview

6.6 MTPA, 2 train development, operated by ExxonMobil

Over its 30-year life, PNG LNG expected to produce more than 9 tcfof gas and 200+ million barrels of associated liquids

Initial Equities: ExxonMobil 33.2%

Oil Search 29.0%

National Petroleum Company of PNG (PNG Government) 16.8%

Santos 13.5%

Nippon Oil 4.7%

MRDC (PNG Landowners) 2.8%

Fully contracted to Asian buyers, with continuing strong market interest

Sinopec (China) ~2.0 MTPA

TEPCO (Japan) ~1.8 MTPA

Osaka Gas (Japan) ~1.5 MTPA

CPC (Taiwan) ~1.2 MTPA777

PNG LNG Project Overview

Main EPC contractors:LNG Plant: Chiyoda/JGCOffshore Pipeline SaipemHides Gas Plant CBI/Clough JVOnshore Pipeline SpiecapagInfrastructure McConnell Dowell/CCC JVEarly Works Clough/Curtain JVAssociated Gas (OSH only) Jacobs (formerly Aker Solutions)

Different labour environment to Australian LNG projects. Workforce of ~16,000, >50% PNG nationals, plus many other different nationalities

First LNG sales on track for 2014, capital cost US$15.7 billion

8

PNG LNG Project Overview

99Port Moresby

7°S

145°E

HidesWells

Kutubu CPF

146°E144°E143°E

6°S

8°S

9°S

GorokaKundiawa

Mt. Hagan

Mendi

Kerema

100km

Daru

Wabag

Lae

Offshore pipeline

Onshore pipelineand Infrastructure

Gobe PF

Kopi Wharf

LNG Facility

Juha Facility

Komo Airfield

Hides Gas Conditioning Plant

Oil Field

Gas Field

Oil Pipeline

PNG LNGGas Pipeline

OSH Facility

PNG LNG Project Facility

Major Road

Kumul Terminal

PNG LNG Plant Site

10

Plant site Feb 2012

Port Moresby

7°S

145°E 146°E144°E143°E

6°S

8°S

9°S

GorokaKundiawa

Mt. Hagan

Mendi

Kerema

Daru

Wabag

Lae

LNG Facility

Kumul Terminal

PNG LNG Plant Site

Storage tank

LNG trains 1 & 2142°E

PNG LNG Project Offshore Pipeline

1212Port Moresby

7°S

145°E 146°E144°E143°E

6°S

8°S

9°S

GorokaKundiawa

Mt. Hagan

Mendi

Kerema

Daru

Wabag

Lae

Kumul Terminal

142°E

Offshore pipeline

Pipelay barge

PNG LNG Project Onshore Pipeline

1313Port Moresby

7°S

145°E

Kutubu CPF

146°E144°E143°E

6°S

8°S

9°S

GorokaKundiawa

Mt. Hagan

Mendi

Kerema

Daru

Wabag

LaeOnshore pipelineand Infrastructure

Gobe PF

Kopi Wharf

Kumul Terminal

142°E

Onshore pipeline welding and burial

PNG LNG AG Projects

1414Port Moresby

7°S

145°E 146°E144°E143°E

6°S

8°S

9°S

GorokaKundiawa

Mt. Hagan

Mendi

Kerema

Daru

Wabag

Lae

Gobe PF

Kumul Terminal

142°E

Kutubu CPF

New CALM Buoy at Kumul

TEG Dehydration Unit installation

PNG LNG Project Upstream

1515Port Moresby

7°S

145°E 146°E144°E143°E

6°S

8°S

9°S

GorokaKundiawa

Mt. Hagan

Mendi

Kerema

Daru

Wabag

Lae

Kumul Terminal

142°EHides Gas Conditioning Plant & access road

Rig 702 being assembled in PNG

Komo Airfield

HidesWells

Komo Airfield

Hides Gas Conditioning Plant

Timetable

1616

2010 2011 2012 2013 2014

FinancialClose

•Continued early works•Detailed design•Order long leads and place purchase orders

•Open supply routes•Contractor mobilisation•Commence AG construction

•Complete pipe lay•Ongoing drilling•Complete Hides plant•Commission LNG plant with Kutubu gas

•Ongoing procurement and mobilisation

•Airfield construction•Drilling mobilisation•Start offshore pipeline construction

•Onshore line clearing and laying

•Start LNG equipment installation

First Gas from Train 1,

then Train 2

•Complete AG •Continue onshore pipe lay

•Complete offshore pipe lay

•Start Hides plant installation

17

17

17

P’nyang South

Activities in PNG Highlands

Four facets to Highlands gas growth strategy, focused on converting proven and probable to proven contractable reserves as well as new exploration and additional seismic:

P’nyang South

Trapia exploration well

Hides development and appraisal drilling

Associated Gas reserves expansion and certification

1818

Angore anticline, PNG Highlands

P’nyang South

P’nyang South 1 discovered 184 metre gas zone in southern fault block

Sidetrack, P’nyang South 1 ST1, drilled to define gas:water contact. Intersected contact ~200 metres below lowest gas in P'nyang South, extending known gas column to ~380 metres

Seismic and structural data suggests additional potential up-dip, taking total gas column to >650 metres

Result materially increases total estimated 2C gas resources in P’nyang field, potential key underpinning volume for LNG expansion

PRL 3: ExxonMobil 49%, Oil Search 38.5%, JX Holdings 12.5% 19

P’nyang 1X

P’nyang South 1

P’nyang 2X

ST1

6°S

8°S

144°E142°E

Hides

Kutubu

SE Gobe

Moran

Agogo

Juha

Angore

100km

P’nyangSouth

Trapia 1

PRL 11: Oil Search 52.5%, ExxonMobil 47.5% Trapia 1 exploration well due to commence drilling shortlyOne of a series of prospects in area with multi-tcf potential 2D seismic programme in 2012/13 to further mature prospectsRecent acquisition of adjacent licence, PPL 277, 50:50 with ExxonMobil

20

6°S

8°S

144°E142°E

Hides

Kutubu

SE Gobe

Moran

Agogo

Juha

Angore

100km

P’nyang Trapia

Trapia 1

Tagari

Huria

NW Angore

Hides Development and Appraisal Drilling

21

Hides Nogoli Camp

GTE PL 1 Hides GTE Plant

PDL 1 – Hides Field10 New WellsDrilling 2012+

36.81%16.66%24.03%20.50%2.00%

PDL 1ExxonMobilOil SearchSantosPNG GovtGas Resources Gigira Ltd.(L/O)

36.81%40.69%20.50%2.00%

PDL 7ExxonMobilOil Search PNG GovtGas Resources Hides No.4 Ltd.(L/O)

36.812%40.69%20.50%2.00%

PDL 8ExxonMobilOil SearchPNG GovtGas Resources Angore Ltd. (L/O)

PDL 7 – South Hides

Hides Gas Conditioning PlantConstruction 2012/13

PDL 8 – Angore Field2 New Wells

10km

Komo Airstrip

Hides development/ appraisal drilling programme:

Part of PNG LNG developmentTwo rig programme, with first rig scheduled to commence in mid 2012Gas:Water Contact (GWC) well planned for early in drilling sequenceGWC well has potential to increase overall Hides resource volume significantlyDrilling timing adjusted to accommodate Project critical path optimisation

Further Reserves from Oil Fields

22

Reserves and deliverability review underway for oil and gas in existing oil fields

Will provide optimal production management plan post commencement of gas production for PNG LNG

Number of recent discoveries, identification of areas for potential new reserves and success in gas conservation ahead of original prognosis will provide further reserves for PNG LNG

Potential upside for both gas and ongoing oil production

2003 2004 2005 2006 2007 2008 2009 2010 2011

50

CPF, APF, GPF Flare History

0

10

20

30

40

2012F

60

70

Dail

y A

vera

ge (

mm

scf/

d)

PNG LNG Project Sanction

Forecast

6°S

8°S

144°E142°E

100km

Kutubu

Gobe

Moran

Agogo

SE Mananda

23Port Moresby

7°S

145°E

Kutubu CPF

146°E144°E143°E

6°S

8°S

9°S

GorokaKundiawa

Mt. Hagan

Mendi

Kerema100km

Daru

Wabag

Lae

Gobe PF

Kopi Wharf

LNG Facility

Hides Gas Conditioning Plant

Kumul Terminal

Oil Field

Gas Field

Oil Pipeline

PNG LNGGas Pipeline

OSH Facility

PNG LNG Project Facility

Major Road

Prospect

Gulf Area LNG

Multi-licence, multi play type, multi well opportunity with material equityLarge, initial seismic programme completed in 2011Significant resource potential identified in proven hydrocarbon (gas & condensate) province:

Over 30 opportunities identified across multiple play typesPotential to support two LNG trains

Additional 3D seismic acquisition underway over neighbouring areaSemi-sub recently contracted to drill 2 firm wells + 2 options, commencing 4Q12Bids from potential partners to farm-in under review, farm-down likely mid-year

24

PRL01

PPL234

PRL10

9°S

145°E 146°E144°E

Gobe

PPL276

PPL312

PPL338

PPL339

PPL339

339

339

338

338

338

339

339

339

8°S

7°S

339

PPL244

50km

Elk/Antelope

KumulTerminal

Pandora

Flinders

2011 3D Seismic Regions

2D Seismic Lines

2D Seismic 2011 Lines

Uramu

Hagana

TadivaLade

New 2012 3D Seismic

Region 2011 3D Seismic Regions

Example of Offshore 3D Seismic (PPL 234)

25

?

Faulted Miocene

Faulted Miocene

Is gas migrating

from the deep kitchen

through faults in the

Miocene section?

2626

Moran, SE Mananda, Agogo 6 well site & Agogo Production Facility

27

Oil Search Production Outlook -existing fields

0

1

2

3

4

5

6

7

8

9

10

2009 2010 2011 2012 2013

Net Production (mmboe)

7.668.12

(Forecast)

6.2-6.76.69

Hides GTESE ManandaSE Gobe

Gobe MainMoranKutubu

Production guidance range for 2012 of 6.2 – 6.7 mmboe, unchanged from 2011 following success in near-field drilling programme (100% success rate in last 36 development/appraisal wells)Production in 2013 expected to be broadly flat, subject to success of work programmesRig 103 being mobilised back from P’nyang to PDL 2, to provide optionality to pursue exploration and appraisal opportunities as well as development programme

2828

Kurdistan Region of Iraq- Taza PSC

Taza PSC: Oil Search 60% (operator), ShaMaran 20%, KRG 20%

Very prospective location adjacent to four fields

Large, simple 4-way dip closure identified from 2010 seismic

Well planning underway for mid-2012 spud

Recoverable resources in success case: 200 - 400 mmbbl (mean estimate), dependent on recovery factors and phases present

2929

Taza PSC

TazaProspect

Up to 180km2

Kor MorGas Field

PulkhanaOil Field

JamburOil Field

Open

Tunisia – Tajerouine PSC

Tajerouine PSC: Oil Search 100%Seismic acquired in 2010, with additional infill seismic shot in late 2011Proven oil plays present and new deeper gas play Fiscal regime favourable – discovery would be materialSemda-1 planned for 4Q12. Potential recoverable resources >100 mmboe

3030

~10km

Tajerouine

Seismic acquisition

PNG Issues

Unprecedented political uncertainty in PNG over past year:

No impact to operations with continued progress on all projects

Security and safety of staff in run up to election is paramount

Election in June/July 2012 with new government formed in August/September:

Anticipate no change to operating status but cautious and watchful

Oil Search likely to be PNG’s largest single investor in 2012, with over US$2bn to be spent on development, appraisal, exploration and operations:

Significant vote of confidence in quality of assets and ability of Company to work with Government, bureaucrats and community and manage operating and investment risks

Future consistency of fiscal terms vital for sustained investment

31

Sustainability Focus

Desire to play a role in long term development and wellbeing of people of PNG – to ‘give back’Continued push towards improved transparency and governance of:

Benefits distributionTaxesLandowner company payments

Investment in community health programmes has doubled, driven by Oil Search Health Foundation:

Expansion of existing health programmes. Now working in 9 provinces across PNGCore public health programmes in Malaria, HIV/Aids, Child and Maternal HealthSupported by The Global Fund, AusAid, Asian Development Bank

Active community development programmes:Education and training AgricultureHealth and sport development

32

Summary

2012 is a potentially transformational year for Oil Search. Unprecedented opportunity to underscore long term value growth from OSH’s portfolio of assets

Peak activity year for PNG LNG Project delivery

Largest drilling programme ever undertaken by Oil Search underway, will continue through 2012 into 2013

Continued strong oil field production performance and active pursuit of near field opportunities

Activities underwritten by strong cash flows, solid balance sheet

Remain confident that country risks and challenges can be managed

33

Appendix 1: Oil Search Production Outlook, including PNG LNG T1/2

34

2008 2009

8.607.66

2010

8.12

2011

6.69

2012 2013 2014 2015 2016 2018

25Net Production (mmboe)

0

5

10

15

20

MENAHides GTESE ManandaSE GobeGobe MainMoranKutubu

2017

6.2-6.7

(Forecast)

3535

Appendix 2: 2012 Guidance

Production:6.2 – 6.7 mmboe

Operating costs US$21 - 24/boe (incl. corporate costs)Impacted by:

Major workover programme to maximise oil recoveries before gas productionFOREXPNG inflation Associated Gas activitiesSustainability initiatives

Depreciation, depletion and amortisation:US$7 - 9/boe Future DD&A profile impacted by life extension activities and development drilling opportunities

Investment outlookExploration (~20-25% MENA): US$240 – 280m (US$145m in 2011)PNG LNG Project (including capitalised interest and fees): US$1,650 – 1,750m (US$1,287m)Production: US$130 – 150m (US$129m)Corporate (including rigs): US$10m (US$7m)Business Development: US$7m (US$10m)

LiquidityLiquidity at 31 March 2012 ~US$1.1 billion (US$0.9bn cash plus corporate facility of US$232m)At end March 2012, US$2.01 billion drawn down under PNG LNG project finance facilityCompany remains well placed to meet existing commitmentsExpect to replace corporate facility prior to 3Q 2013 expiry

Appendix 3: Other Key PNG Players

36

Talisman/Mitsubishi have significant acreage in Western Forelands. InterOilhas strong position in Eastern Forelands

OSH strategy focused on core PNG LNG Foldbelt acreage and Gulf - viewed as offering greatest potential for large gas discoveries

Oil Search Equity Participation

Talisman Equity Participation NGE & Interoil Equity Participation

NGE

Interoil

Port Moresby

Juha

Gobe

Kutubu & Agogo

Hides & Angore

8°S

6°S

146°E142°E100km

Port Moresby

Juha

Gobe

Kutubu & Agogo

Hides & Angore

8°S

6°S

146°E142°E100km

Port Moresby

Juha

Gobe

Kutubu & Agogo

Hides & Angore

8°S

6°S

146°E142°E100km

DISCLAIMER

While every effort is made to provide accurate and complete information, Oil Search Limited does not warrant that the information in this presentation is free from errors or omissions or is suitable for its intended use. Subject to any terms implied by law which cannot be excluded, Oil Search Limited accepts no responsibility for any loss, damage, cost or expense (whether direct or indirect) incurred by you as a result of any error, omission or misrepresentation in information in this presentation. All information in this presentation is subject to change without notice.

This presentation also contains forward-looking statements which are subject to particular risks associated with the oil and gas industry. Oil Search Limited believes there are reasonable grounds for the expectations on which the statements are based. However actual outcomes could differ materially due to a range of factors including oil and gas prices, demand for oil, currency fluctuations, drilling results, field performance, the timing of well work-overs and field development, reserves depletion, progress on gas commercialisation and fiscal and other government issues and approvals.

37