Marathon Oil Announces New Time for Second Quarter 2013 Earnings Conference Call on Aug. 7

Marathon Oil Announces New Time for Second Quarter 2013 Earnings Conference
Call on Aug. 7

HOUSTON, July 18, 2013 (GLOBE NEWSWIRE) -- Marathon Oil Corporation (NYSE:
MRO) announced today a change of time for its second quarter 2013 earnings
conference call. The conference call, which will be webcast live and consist
of questions and answers only, is now scheduled for 8 a.m. EDT on Wednesday,
Aug. 7. The slide presentation and associated commentary that has opened the
call in the past will not be part of the Aug. 7 conference call, but will be
posted online after the market closes on Tuesday, Aug. 6.

Howard J. Thill, vice president, Investor Relations and Public Affairs, will
host the call. Also participating from Marathon Oil will be Clarence P.
Cazalot, Jr., executive chairman, Lee M. Tillman, president and CEO, and Janet
F. Clark, executive vice president and chief financial officer.

The call will include forward-looking information.

All of the above information can be accessed by visiting Marathon Oil's
website at http://www.MarathonOil.com. The prepared comments, slide
presentation and replay of the question-and-answer session will be available
on the website through Sept. 7, 2013. Additional financial information,
including earnings releases and other investor-related material, is available
online and on Marathon Oil's app for mobile devices.

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CONTACT: Media Relations Contacts
         Lee Warren: 713-296-4103
         John Porretto: 713-296-4102
        
         Investor Relations Contacts
         Howard Thill: 713-296-4140
         Chris Phillips: 713-296-3213