Exxon Mobil Corp. has discovered more oil on the Staborek block offshore Guyana, northeast South America, with the Turbot-1 well. ExxonMobil affiliate Esso Exploration and Production Guyana Ltd. began drilling the Turbot-1 well on Aug. 14, 2017, and encountered a reservoir of 23 m of high-quality, oil-bearing sandstone in the primary objective.