Multi-basin Mayhem: Conoco, Marathon Tout Eagle Ford, Bakken Runway / Latest / By mark ConocoPhillips and Marathon Oil—which both trace their roots to the breakup of John D. Rockefeller’s Standard Oil Trust more than a century ago—are combining in a $22.5 billion deal. Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on X (Opens in new window) X Related