[Contents 2 CHAIRMAN’S STATEMENT 4 KEY FIGURES 5 BUSINESS OVERVIEW 11 INTERIM CONDENSED CONSOLIDATED STATEMENT OF PROFIT OR LOSS AND OTHER COMPREHENSIVE INCOME 13 INTERIM CONDENSED CONSOLIDATED STATEMENT OF FINANCIAL POSITION 15 INTERIM CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY 16 INTERIM]

[Announcement of 2020 Interim Results (Unaudited) FINANCIAL AND BUSINESS SUMMARY First half of 2020 % change over Net production of oil and gas* 257.9 million BOE 6.1 % Oil and gas sales RMB66.34 billion -29.9 % Consolidated net profit RMB10.38 billion -65.7 % Basic earnings per share RMB0.23 -65.7 %]

[(Incorporated in Hong Kong with limited liability under the Companies Ordinance) ) (Stock Code: 00883 DATE OF BOARD MEETING Board Company The board of directors (the “ By Order of the Board CNOOC Limited Wu Xiaonan Joint Company Secretary Hong Kong, 7 August 2020 As at the date of this announcement,]

[中國海洋石油有限公司 CNOOC LIMITED CNOOC Limited Announces Luda 21-2/16-3 Regional Development Project Commences Production (Hong Kong, July 20 , 2020) - CNOOC Limited (the “Company”, SEHK: 00883, NYSE: CEO, TSX: CNU) announced today that Luda 21-2/16-3 regional development regional has commenced production. ]

[中國海洋石油有限公司 CNOOC LIMITED CNOOC Limited Announces a Significant Discovery of Huizhou 26-6 in Eastern South China Sea (Hong Kong, June 29, 2020) - CNOOC Limited (the “Company”, SEHK: 00883, NYSE: CEO, TSX: CNU) announced today that the Company made a significant discovery of Huizhou 26-6 in Eastern So]