PentaNova has farmed into the Sur Rio Deseado Este lease, the deal initiated in May â17 (by Patagonia Oil) for an undisclosed sum. The blockâs potential of heavy oil is mentioned as one of the motivations. Sur Rio Deseado Este covers 305 sq km in the San Jorge Basin onshore. The farmin is 2-fold: 54.14% in 50 sq km of production area in the western part (Estacion Tehuelches, La Frieda, and La Frieda Oeste fields), and 7.92% in the remaining 255 sq km of exploration area. Partners otherwise Pluspetrol, San Enrique Petr. + Secra.  
Alianza Petrolera has acquired the 54% interest from Roch for the Rio Deseado Este I exploration block (269kmÂ²) and for the Sur Rio Deseado Este II (52kmÂ²).