Marathon Oil Publishes 2012 Corporate Social Responsibility (CSR) Report

Marathon Oil Publishes 2012 Corporate Social Responsibility (CSR) Report

HOUSTON, June 20, 2013 (GLOBE NEWSWIRE) -- Marathon Oil Corporation (NYSE:
MRO) today announced it has published its "Living Our Values 2012 Corporate
Social Responsibility (CSR) Report,"which provides information on the
Company's non-financial performance and its actions to promote greater
economic, social and environmental sustainability.

Supporting education and health care in
Equatorial Guinea
 In 2012, Marathon Oil undertook social
 investment programs focused on
 education and health care in Equatorial
 Guinea, where the Company has key base
 assets. These programs included the
 construction of two rural schools on
 Bioko Island and refurbishing a clinic
 to support public health. Additionally,
 in its ninth year, Marathon Oil's
 employee-sponsored Books for Bioko
 program continued to have a positive
 impact on primary and secondary
 students in seven schools on Bioko
 Island.

The new report reflects Marathon Oil's first full year as an independent
international energy company and continues to highlight the Company's
unwavering commitment to living its long-standing values of health and safety,
environmental stewardship, honesty and integrity, corporate citizenship and a
high performance team culture.

For the first time, the new report is available in a digital-only format at
http://www.marathonoil.com/lov2012/, which allows the Company to expand its
reporting. Marathon Oil also has adopted eight corporate-level commitments
covering governance, society, environment and the workplace. For each
commitment, the report outlines progress made in 2012 and primary activities
planned for 2013.

"Our commitment to Marathon Oil's CSR principles runs deep throughout our
entire Company," said Clarence P. Cazalot Jr., Marathon Oil's chairman,
president and CEO. "Importantly, these elements of our business have been
integrated into our day-to-day operations and, in this regard, our local
operating teams are responsible for implementing programs to fulfill the
commitments, including setting measurable goals to drive improvement. We
believe this is the best way to have a positive impact in our communities."

Marathon Oil Corporation is an international exploration and production
company. Based in Houston, Texas, the Company had net proved reserves at the
end of 2012 of 2 billion barrels of oil equivalent in North America, Europe
and Africa. The"Living Our Values 2012 Corporate Social Responsibility
Report"athttp://www.marathonoil.com/Social_Responsibility/Reportingand
other information about Marathon Oil are available on the Company's website
athttp://www.marathonoil.com

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A photo accompanying this release is available at:
http://www.globenewswire.com/newsroom/prs/?pkgid=19441

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