ExxonMobil has started a drillstem test at one of its most promising new hydrocarbons discoveries in the prolific Stabroek block off Guyana, as the US supermajor also spins the bit on its latest wildcat on the prolific tract.

According to a notice published by Guyana’s Maritime Administration Department, the company began on 11 December a test at the Redtail-1 find using the Stena Drilling drillship Stena Carron in 1878 metres of water.