PTTEP Operations Overview

Project information 3/5 Partners Project Status* Phase PTTEP's Share (as of April 2021) Others SEA Vietnam 9-2 JOC Production 6M 2021 Average Sales Volume ** Gas (MMSCFD) Liquid (KBPD) 2021 Key Activities 25% PetroVietnam SOCO 50% 15 3 • Maintain production level 25% PetroVietnam 41% 10 Vietnam 16-1 JOC Production 28.5% SOCO OPECO 28.5% 8 12 2% • 11 Vietnam B & 48/95 JV Exploration 8.5% PetroVietnam MOECO 65.88% 25.62% 73.4% JV PetroVietnam 12 Vietnam 52/97 Exploration 7% 19.6% MOECO Development drilling study support • Maintain production level • Drill development wells • Under procurement process for Equipment and Services Negotiation process on commercial terms in order to push forward the Final Investment Decision (FID) • The first production target at the end of 2024 • Negotiation process on commercial terms in order to push forward the Final Investment Decision (FID) • The first production target at the end of 2024 Premier Oil 28.67% JV KUFPEC 33.33% 13 Natuna Sea A Production 11.5% 214 2 • Drill development wells Petronas Pertamina 15% 11.5% Middle East 1 Abu Dhabi Offshore 1 JV Exploration 30% Eni Abu Dhabi 70% 2 Abu Dhabi Offshore 2 JV Exploration 30% Eni Abu Dhabi 70% 3 Abu Dhabi Offshore 3 JV Exploration 30% Eni Abu Dhabi 70% • Being evaluated for petroleum potential to support future exploration, including G&G report . Preparation for exploration well which to be drilled in Q3/2021 • • Appraisal plan of Pre-existing discovery has been approved by ADNOC Project is on-going with G&G study. Government of Oman 60% 4 PDO (Block 6) JOC Production 2% Shell 34% 627** • Normal operations with daily production around 600 KBD Total 4% Occidental 47% OOCEP 20% 5 Mukhaizna JV Production 1% 96** • Normal operations with daily production around 95 KBD Indian Oil 17% Mubadala 15% 6 Oman Onshore Block 12 Total E&P Oman Block 12 JV Exploration 20% 80% B.V. • • 3D seismic reprocessing (original 3D) in progress Preparation of 3D seismic acquisition (new 3D) BP 40% Makarim Gas 30% 7 Oman Block 61 JV Production 20% Development LLC 647 31 • Completed production ramp up as planned PC Oman Ventures Limited (PETRONAS) 10% Status: OPPTTEP operatorship / JOC = PTTEP joint operatorship // JV = PTTEP as Joint Venture Partner Sales volume stated at 100% basis / For PDO (Block 6) and Mukhaizna projects, gross production is net off unitization 39 99

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