The Ghana National Petroleum Company (GNPC) is the state agency responsible for the exploration, licensing, and distribution of petroleum-related activities in Ghana.
Ghana has four sedimentary basins. These are the Cote d'Ivoire-Tano Basin (including Cape Three Points Sub-basin), the Saltpond Basin, the Accra/Keta Basin and the Inland Voltaian Basin.
The offshore basins cover about 60,000 km² (0-3500m water depth) extending from the Cote d'Ivoire-Ghana maritime border in the west to the Ghana-Togo maritime border in the east. The onshore/coastal expressions of the Tano and Keta basins respectively and located at the southwestern and southeastern corner of Ghana, have a total size of about 4,000 sq. km. The Inland Voltaian basin is the largest sedimentary basin in Ghana. It occupies the central-eastern-northern part of Ghana. It is about 103,600 sq. km in size.
The Sedimentary basins are divided into quadrants of size one degree by one degree, equivalent to about 12, 420 sq. km. Each quadrant is further divided into eighteen (18) blocks with each block size equal to about 690 sq. km.