| 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   |
| CNOOC      Finance (2004) 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      ONWJ Ltd.                  | 100% | Labuan,      F.T.,Malaysia   |
| 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      Blora Ltd.                 | 100% | Labuan,      F.T.,Malaysia   |
| CNOOC      NWS Private Limited        | 100% | Singapore                    |
| CNOOC      Australia E&P Pty Ltd. | 100% | Australia                    |

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|                                                          |   |                              |
|---------------------------------------------------------------|--------|-----------------------------------|
| CNOOC      Wiriagar Holding Limited                      | 100%   | British      Virgin Islands       |
| CNOOC      Wiriagar Overseas Limited*                         | 100%   | British      Virgin Islands  |
| CNOOC      Muturi Holding Limited                        | 100%   | British      Virgin Islands       |
| CNOOC      Muturi Limited                                     | 100%   | The      Isle of Man         |
| CNOOC      Morocco Ltd.                                       | 100%   | Cayman      Islands          |
| CNOOC      Canada Limited                                     | 100%   | Canada                       |
| 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      Caspian (Kazakhstan) Ltd.                          | 100%   | Cayman      Islands               |

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