[] [INDENTURE Dated as of , 2013 Among CNOOC FINANCE (2013) LIMITED as Issuer CNOOC LIMITED as Guarantor THE BANK OF NEW YORK MELLON as Trustee THE BANK OF NEW YORK MELLON as Paying Agent and THE BANK OF NEW YORK MELLON as Registrar DEBT SECURITIES TABLE OF CONTENTS Page ARTICLE I DEFINITIONS Section]