HONG KONG,Sept. 18,2024 -- CNOOC Limited (the "Company",SEHK: 00883 (HKD Counter) and 80883 (RMB Counter),SSE: 600938) announces today that thanks to its mature typhoon response measures,the Typhoon "Bebinca" did not have an impact on the Company.

Recently,Typhoon "Bebinca" crossed the East China Sea,becoming the strongest typhoon to make landfall in Shanghai since 1949. Adheringtoits core values of health,safety and environmental protection (HSE),namely"Safety First,Environmental Paramount,People-oriented,and Equipment Intact",CNOOC Limited work together with all the support personnel to promptly evacuate staffs working on offshore platform before the typhoon's arrival to ensure their health and safety.

The "Typhoon Production" model of CNOOC Limited has once again withstood the challenge. During the passing of Typhoon "Bebinca",through its onshore control under typhoon mode,the Company implemented remote control production of offshore platforms to ensure continuous and stable production during the typhoon. Upon the landing of the typhoon,the Company promptly initiated recovery efforts to ensure the steady operation and production of offshore oil and gas fields.

— End —

Notes to Editors:

More information about the Company is available at http://www.cnoocltd.com.

*** *** *** ***

This press release includes forward looking information,including statements regarding the likely future developments in the business of the Company and its subsidiaries,such as expected future events,business prospects or financial results. The words "expect","anticipate","continue","estimate","objective","ongoing","may","will","project","should","believe","plans","intends" and similar expressions are intended to identify such forward-looking statements. These statements are based on assumptions and analyses made by the Company as of this date in light of its experience and its perception of historical trends,current conditions and expected future developments,as well as other factors that the Company currently believes are appropriate under the circumstances. However,whether actual results and developments will meet the current expectations and predictions of the Company is uncertain. Actual results,performance and financial condition may differ materially from the Company's expectations,including but not limited to those associated with macro-political and economic factors,fluctuations in crude oil and natural gas prices,the highly competitive nature of the oil and natural gas industry,climate change and environmental policies,the Company's price forecast,mergers,acquisitions and divestments activities,HSSE and insurance policies and changes in anti-corruption,anti-fraud,anti-money laundering and corporate governance laws and regulations.

Consequently,all of the forward-looking statements made in this press release are qualified by these cautionary statements. The Company cannot assure that the results or developments anticipated will be realised or,even if substantially realised,that they will have the expected effect on the Company,its business or operations.

*** *** *** ***

For further enquiries,please contact:

Ms. Cui Liu

Media & Public Relations

CNOOC Limited

Tel: +86-10-8452-6641

Fax: +86-10-8452-1441

E-mail: mr@cnooc.com.cn

Mr. Bunny Lee

Porda Havas International Finance Communications Group

Tel: +852 3150 6707

Fax: +852 3150 6728

E-mail: cnooc.hk@pordahavas.com