Group 1 - Exxon Mobil Corporation has commenced production at the Yellowtail development in the Stabroek Block, offshore Guyana, with the One Guyana FPSO contributing to a total capacity exceeding 900,000 barrels of oil per day [1][9] - The One Guyana FPSO, the largest in the Stabroek Block, has a production capacity of approximately 250,000 barrels per day and can store up to 2 million barrels of crude [2] - The start of production from the fourth FPSO is a significant milestone for ExxonMobil and its partners, moving closer to a target production capacity of 1.7 million barrels of oil equivalent per day by 2030 [4] Group 2 - The Stabroek Block is operated by a consortium including ExxonMobil, Hess Corporation, and China's CNOOC, with Chevron Corporation now having access to its vast reserves following the acquisition of Hess [3] - The crude oil produced from the One Guyana FPSO will be marketed as "Golden Arrowhead" crude [3] - The Stabroek Block has become one of the most prolific hydrocarbon-producing regions in Latin America, significantly enhancing profits for ExxonMobil and its partners [4]