The logo of Exxon Mobil Corporation is shown on a monitor above the floor of the New York Stock Exchange in New York, December 30, 2015. REUTERS/Lucas Jackson Purchase Licensing RightsSonatrach has signed an agreement with U.S. oil major Exxon Mobil (XOM.N), opens new tab to allow the study of opportunities to develop hydrocarbon resources in Algeria's Ahnet and Gourara basins, the state-owned Algerian oil and gas group said on Thursday.
