ExxonMobil said on Tuesday it will proceed with a long-term oil and natural gas development project on a block in Argentina, targeting the Vaca Muerta shale play. The US-based company plans to drill 90 wells to take production to 55,000 b/d of oil equivalent in five years from the Bajo del Choique-La Invernada block in the Neuquen Basin in the country's southwest, the company said in a statement.