Nigeria, the most populous country in Africa, has a rapidly growing oil industry. Production doubled in 1965, and reached over one half million barrels of oil a day in 1966. The oil-producing area is the coastal sedimentary basin, where the deposition has been continuous from Middle Cretaceous to the present time. Hydrocarbon accumulation is usually found in roll-over anticlines associated with growth faults. The very high cost of operations, the logistics involved, and varying values of mud resistivities, formation water resistivities and degree of sediment consolidation complicate formation evaluation in Nigeria. Accordingly, if Nigerian oil is to be discovered and developed efficiently and economically, formation evaluation methods must be refined as much as possible. This well evaluation review, by bringing to our attention the latest technology and problems, should help to lower costs and could lead to the discovery of more oil.

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