The Albertine graben is a Cenozoic rift basin formed and developed on the Precambrian orogenic belts of the African Craton. Rifting was initiated during the late Oligocene or Early Miocene ( 25-40 million years ago).
The Albertine graben was initiated by either reactivating pre-Cambrian lineaments or creating new normal faults by an extensional regime during the Cretaceous prior to initiation of the East African Rift System. Available geological and geophysical data suggest that the Albertine graben has undergone substantial tectonic movements and thick sediments (approximately 6 km) have been deposited in fluvial deltaic and lacustrine environments. Surface geological mapping undertaken by the Petroleum Exploration and Production Department and the wells drilled by the Licensees so far indicate these sediments to be predominantly sandstones, siltstones, clay stones and shales. The sandstones and siltstones are mostly of high porosity and permeability.