Acquisition of seismic data within the Anza Basin commenced in 1975
Acquisition of seismic data within the Anza Basin commenced in 1975 when Whitestone acquired 2D seismic data, with further acquisition surveys carried out by the Ministry of Energy, Chevron, Total E&P, Amoco & Shell over time. On acquiring seismics, Chevron later drilled Anza-1 and Bahati-1 (both dry), Total E&P drilled Ndovu-1 (oil and gas shows), Duma-1 (gas shows) and Kaisut-1 (dry) while Amoco drilled Sirius-1, Bellatrix-1, Chalbi-3, Hothori-1 (all three-had oil and gas shows) and Endela-1 (gas shows).
Additional 2D and 3D seismic have been acquired by Vanoil, Lion Petroleum, CNOOC, Africa Oil and Tullow in this basin from 2007 to date. The first hydrocarbon discovery was made in 2009 by CNOOC in Bogal-1 well, that encountered gas with a gross best estimate of 2500 Bcf. Tullow later drilled Paipai-1 well that encountered light hydrocarbon shows. Another gas discovery was made in the Sala-1 well in 2014 by Africa Oil within three distinct zones of interest over a 1000-meter gross interval. However, the subsequent Sala-2 well drilled to test the updip extent of this main reservoir sand in the Sala-1 gas discovery failed to find any significant hydrocarbons.