Block H is located in the Termit Basin which is part of the West Central African Rift System and is located in the Central-West portion of Chad.

The Termit Basin, at about 1000 km long, 150 km wide and up to 12 km thick, is one of the largest rift basins in Africa and was formed as during the breakup of Gondwanaland, rifting and the opening of the south Atlantic.

The basin has a significant difference in sedimentary fill from other African rift basins in that during Cretaceous time the basin was open to the South Atlantic Ocean and has potentially prolific marine source rocks.

The Termit Basin, although underexplored in Chad, has been extensively explored in Niger with tremendous success yielding numerous oil and gas discoveries.  In Niger the basin has 975 MMbbls of 2P reserves and is currently producing 20,000 bbls/day.  Three discoveries in Chad prove the extension of the functioning Petroleum System into the Chadian portion of the basin.

Petroleum System consists of Tertiary, Upper Cretaceous and Lower Cretaceous deposits of primarily lacustrine and marine sediments.

High permeability sands penetrated by a number of wells, the presence of good shale seals and the structural complexity of the basin creates a number of different trap options.  Oil accumulations in the Eocene often occur in medium sized tilted fault blocks created during late extensional faulting.  Cretaceous oil pools are found in erosional remnants at the base Tertiary unconformity, stratigraphic traps within the large fault blocks or in three-way closures against large down-to-basin extensional faults.