New oil findings at a deeper layer in Guyana’s seabed could help adding billions of barrels to what is already the world’s largest oil discovery in 20 years, Hess Corp (HES.N) Chief Executive John Hess said on Thursday during a webcast. Hess (HES.N) has a 30% stake in an Exxon Corp (XOM.N) -led consortium that has found 11 billion barrels of oil and gas in the tiny-South America country. The group, which made most of its more than 30 oil discoveries at 15,000 feet depths, has started to drill at 18,000 feet, he said. “We are starting to find other attractive deep prospects,” Hess said at Bernstein’s Annual Strategic Decisions conference. “There are multi-billion barrels remaining on top of” the […]