The waters offshore Ghana have already given rise to the giant Jubilee oil field, where Kosmos Energy detected an overlooked Upper Cretaceous structural-stratigraphic play concept in the Tano Basin. The 2007 discovery opened the door to a new hydrocarbon province, putting the West African country on the map. More oil and gas finds followed, including the TEN fields along with the Sankofa, Gye and Nyame fields. Companies such as Exxon Mobil Corp. have since joined a list of explorers that includes Kosmos Energy, Tullow Oil and Eni SpA. "It took a while for companies to see that and convince themselves that the deepwater [offshore Ghana] has potential," said Michael Aryeetey, exploration and appraisal manager with the Ghana National Petroleum Corp. (GNPC), referring to activity following Jubilee.

11