Five phases of exploration history have evolved in Tanzania since in the 1950s. Phase One (1952-1964) had BP and Shell companies conducted exploration in coastal basins and the Islands. Extensive geological work was conducted including drilling of more than 100 stratigraphic shallow boreholes, gravity, aeromagnetic, seismic reflection and refraction surveys. Four wildcats were drilled, one each on Zanzibar, Pemba, and Mafia Islands and in the Mandawa Salt Basin. The second Phase (1969-1979) is associated with large regional, on and offshore, seismic surveys were conducted. During that period three onshore and two offshore wells, including the significant gas discovery at Songo Songo in 1974 were drilled. Third Phase (1980-1991) recognized drilling of more wells including the Mnazi bay gas discovery well as a result of good oil price. Fourth phase (1992-2002) recorded low level of exploration activities. The current Phase V (2005 to 2015) has registered extensive geophysical surveys to include 2D and 3D marine seismic surveys. About 27 deep sea wells among with the appraisal wells were also drilled. Offshore discoveries encountered natural gas amounting to about 47.08TCF on the mean side and 8TCF onshore. This indicates gas already been discovered in Tanzania to be approximately 55.08TCF to date.
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