The giant Zakum field is located centrally within Abu Dhabi's offshore area. The field produces light sour crude (34o - 40o API) from Cretaceous carbonates. The Lower and Upper Zakum developments are operated under two separate joint ventures. ExxonMobil was awarded a 28% stake in the field in 2006, with the aim of increasing production capacity to 750,000 b/d, and maintain that plateau for 25 years, achieving 70% oil recovery. The development includes the construction of four artificial islands to provide a land base for the drilling rigs and processing facilities.