Shell may be considering leaving the Vaca Muerta shale play in Argentina, Reuters has reported, citing unnamed sources. Both a partial asset sale and a full exit are on the table, according to the report, with the deal or deals potentially fetching billions. The Vaca Muerta play is considered the second-largest shale oil and gas formation in the world, which has made it a magnet for energy companies, including several Big Oil heavyweights that have invested substantial amounts into developing the resources in the play. Shell specifically has been…