MOECO acquired a 15% interest in Block 122 offshore central Vietnam

August 18, 2009 Project

Mitsui Oil Exploration Co., Ltd. ("MOECO", Head office: Hibiya Central Bldg. 2-9, Nishi Shimbashi 1-Chome, Minato-ku, Tokyo, Japan/ President: Mr. Yoshiyuki Kagawa) is pleased to announce that Moeco Phu Khanh Co., Ltd. (MPC), a 100% subsidiary of MOECO, acquired a 15% interest in Block 122 offshore central Vietnam under the Production Sharing Contract on August 18, 2009. Chevron Vietnam Phu Khanh (Block 122), Ltd. is the operator holding a 20% interest. The other interest owners are PETRONAS Carigali Overseas Sdn. Bhd. (50%) and GS Caltex Corporation (15%).

The block is located in the Phu Khanh basin offshore central Vietnam. MPC is engaged in exploration activities for discovery of crude oil.