Two New Exploration Discoveries in Bohai

                   Two New Exploration Discoveries in Bohai

PR Newswire

HONG KONG, July 30, 2013

HONG KONG, July 30, 2013 /PRNewswire/ -- CNOOC Limited (the "Company", NYSE:
CEO, SEHK: 00883) today announced that the Company has made two new
exploration discoveries Bozhong 8-4 and Kenli 10-4 in Bohai.

(Logo: http://www.prnasia.com/sa/200701301659.jpg)

Bozhong 8-4 is located in the west slope of Bozhong Sag in Bohai, with an
average water depth of about 28 meters. The Company has already drilled
wildcats on this structure before. The discovery well Bozhong 8-4-4 is drilled
and completed at a depth of 1,962 meters and encountered oil pay zones and gas
reservoir with a total thickness of about 50 meters and 11 meters,
respectively. During the test period, the oil production of the well was
around 660 barrels per day.

Kenli 10-4 is located in the south slope of Laizhou Bay Sag in Bohai, with an
average water depth of about 15 meters. The discovery well Kenli 10-4-1 is
drilled and completed at a depth of 2,395 meters and encountered oil pay zones
with a total thickness of about 45 meters. During the test period, the oil
production of the well was around 2,800 barrels per day.

Mr. Zhu Weilin, Executive Vice President of the Company and General Manager of
Exploration Department commented, "The successful discovery of Bozhong 8-4 and
KL 10-4 has extended our effective exploration activities in Bohai and further
proven the rich oil and natural gas resources in this area." 

Notes to Editors:

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

This press release includes "forward-looking statements" within the meaning of
the United States Private Securities Litigation Reform Act of 1995, including
statements regarding expected future events, business prospectus 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
analysis made by the Company in light of its experience and perception of
historical trends, current conditions and expected future developments, as
well as other factors that the Company believes reasonable under the
circumstances. However, whether actual results and developments will meet the
Company's expectations and predictions depends on a number of risks and
uncertainties which could cause the actual results, performance and financial
conditions to differ materially from the Company's expectations, including
those associated with fluctuations in crude oil and natural gas prices, the
exploration or development activities, the capital expenditure requirements,
the business strategy, whether the transactions entered into by the Company
can complete on schedule pursuant to its timetable or at all, the highly
competitive nature of the oil and natural gas industries, the foreign
operations, environmental liabilities and compliance requirements, and
economic and political conditions in the People's Republic of China. For a
description of these and other risks and uncertainties, please see the
documents the Company has filed from time to time with the United States
Securities and Exchange Commission, including 2012 Annual Report on Form 20-F
filed on April 24, 2013.

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 realized or, even if
substantially realized, that they will have the expected effect on the
Company, its business or operations.

For further enquiries, please contact:

Ms. Michelle Zhang
Deputy Manager, Media / Public Relations
CNOOC Limited
Tel: +86-10-8452-6642
Fax: +86-10-8452-1441
E-mail: MR@cnooc.com.cn

Ms. Angela Hui
Ketchum Newscan Public Relations Ltd
Tel: +852-3141-8091
Fax: +852-2510-8199
E-mail: angela.hui@knprhk.com

SOURCE CNOOC Limited

Website: http://www.cnoocltd.com/