WeeklyExxonMobil to target Vaca Muerta expansionUS supermajor to drill 90 wells in development of Neuquen acreage in Argentine shale playLeading the way: a drilling rig at Loma Campana, the Vaca Muerta's central shale assetPhoto: AFP/SCANPIXJulia MartinezSteve MarshallHouston/Oslo