| Name of entity                                       |   | Our interest |   | Jurisdiction of incorporation |
|------------------------------------------------------|--------|--------------|--------|-------------------------------|
| CNOOC China Limited                                  |   | 100%         |   | Tianjin, PRC                  |
| CNOOC International Limited                          |   | 100%         |   | British Virgin Islands        |
| China Offshore Oil (Singapore) International Pte Ltd |   | 100%         |   | Singapore                     |
| CNOOC Finance (2002) Limited                         |   | 100%         |   | British Virgin Islands        |
| CNOOC Finance (2003) Limited                         |   | 100%         |   | British Virgin Islands        |
| Malacca Petroleum Limited                            |   | 100%         |   | Bermuda                       |
| OOGC America, Inc.                                   |   | 100%         |   | Delaware, USA                 |
| OOGC Malacca Limited                                 |   | 100%         |   | Bermuda                       |
| CNOOC Southeast Asia Limited                         |   | 100%         |   | Bermuda                       |
| CNOOC Africa Holding Ltd.                            |   | 100%         |   | British Virgin Islands        |
| CNOOC Africa Ltd.                                    |   | 100%         |   | British Virgin Islands        |
| CNOOC Africa (UK) Limited                            |   | 100%         |   | London, U.K.                  |
| CNOOC SES Ltd.                                       |   | 100%         |   | Labuan, F.T.,Malaysia         |
| CNOOC Poleng Ltd.                                    |   | 100%         |   | Labuan, F.T.,Malaysia         |
| CNOOC Madura Ltd.                                    |   | 100%         |   | Labuan, F.T.,Malaysia         |
| CNOOC NWS Private Limited                            |   | 100%         |   | Singapore                     |
| CNOOC Australia E&P Pty Ltd                      |   | 100%         |   | Australia                     |
| CNOOC Wiriagar Holding Limited                       |   | 100%         |   | British Virgin Islands        |
| CNOOC Muturi Holding Limited                         |   | 100%         |   | British Virgin Islands        |
| CNOOC Muturi Limited                                 |   | 100%         |   | The Isle of Man               |
| CNOOC Canada Limited                                 |   | 100%         |   | Canada                        |

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| CNOOC Belgium BVBA                                     |   | 100%   |   | Belgium                |
|--------------------------------------------------------|--------|--------|--------|------------------------|
| CNOOC Australia Limited                                |   | 100%   |   | British Virgin Islands |
| CNOOC Exploration & Production Nigeria Limited     |   | 100%   |   | Nigeria                |
| AERD Projects Nigeria Limited                          |   | 92.11% |   | Nigeria                |
| CNOOC Hong Kong Holding Limited                        |   | 100%   |   | Hong Kong              |
| CNOOC Myanmar Holding Ltd.                             |   | 100%   |   | British Virgin Islands |
| CNOOC Myanmar Ltd.                                     |   | 100%   |   | British Virgin Islands |
| CNOOC Middle East (Qatar) Limited                      |   | 100%   |   | British Virgin Islands |
| CNOOC Congo SA                                         |   | 100%   |   | Republic of Congo      |
| CNOOC Caspian (Kazakhstan) Ltd.                        |   | 100%   |   | Cayman Islands         |
| CNOOC Singapore Private Limited                        |   | 100%   |   | Singapore              |
| CNOOC Australia Energy Pty Ltd                         |   | 100%   |   | Australia              |
| CNOOC Batanghari Ltd.                                  |   | 100%   |   | Malaysia               |
| CNOOC Palung Aru Ltd.                                  |   | 100%   |   | Malaysia               |
| CNOOC FPSO Holding Limited                             |   | 100%   |   | Liberia                |
| CNOOC Liberia Limited                                  |   | 100%   |   | Liberia                |
| CNOOC Uganda (BVI) Ltd                                 |   | 100%   |   | British Virgin Islands |
| De coöperatieve vereniging CNOOC Netherlands U.A. |   | 100%   |   | The Netherlands        |
| CNOOC Netherlands B.V.                                 |   | 100%   |   | The Netherlands        |
| CNOOC Uganda Ltd                                       |   | 100%   |   | Uganda                 |
| CNOOC Deepwater Development Limited                    |   | 100%   |   | Zhuhai, PRC            |
| CNOOC Hainan Dock Limited                              |   | 100%   |   | Zhuhai, PRC            |
| CNOOC Iraq Limited                                     |   | 100%   |   | British Virgin Islands |
| CNOOC Finance (2011) Limited                           |   | 100%   |   | British Virgin Islands |

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| CNOOC Algeria (BVI) Limited                          |   | 100% |   | British Virgin Islands |
|------------------------------------------------------|--------|------|--------|------------------------|
| CNOOC Reserves Fund I, Ltd.                          |   | 100% |   | Cayman Islands         |
| CNOOC Luxembourg S.à r.l.                       |   | 100% |   | Luxembourg             |
| CNOOC Investment Canada Inc.                         |   | 100% |   | Canada                 |
| CNOOC Canada Inc.                                    |   | 100% |   | Canada                 |
| CNOOC Eagle Ford Midstream LLC                       |   | 100% |   | Delaware, USA          |
| CNOOC Niobrara Midstream LLC                         |   | 100% |   | Delaware, USA          |
| Tainan-Chaoshan Petroleum Operating Company Limited* |   | 50%  |   | British Virgin Islands |
| Husky - CNOOC Madura Limited *                       |   | 50%  |   | British Virgin Islands |
| Chaoyang Petroleum (BVI) Limited*                    |   | 50%  |   | British Virgin Islands |
| Chaoyang Petroleum (Trinidad) Block 3A Limited*      |   | 50%  |   | Barbados               |
| Chaoyang Petroleum (Trinidad) Block 2C Limited*      |   | 50%  |   | Barbados               |
| Bridas Corporation*                                  |   | 50%  |   | British Virgin Islands |
| Northern Cross (Yukon) Limited*                      |   | 50%  |   | Canada                 |

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