ProductionGuyana still a powerhouse for Hess ahead of planned merger with ChevronPickerel discovery begins producing oil for Hess in US Gulf of MexicoHess chief executive John Hess speaks at the 23rd World Petroleum Congress in Houston, Texas, USA on Tuesday, 7 December 2021.Photo: NICK AGRO/CORPORATEEVENTIMAGESRobert StewartNorth America Energy CorrespondentBaton Rouge