Moreover, through petrographic analysis of the Candeleros and Huincul Formations we checked the presence of the Huincul High, a morpho structural feature that would have divided the Neuquén Basin in two sub basins. The field work we identified 14 lithofacies and 13 facies associations, which allowed to interpret that: the Rayoso Formation consists of fine and medium grained sandstones interpreted as fluvial deposits interbedded with low energy alluvial and lacustrine deposits; the Candeleros Formation consists of coarse to fine grained…