PoliticsPre-salt discovery set to tempt explorers to Angola's offshoreAzul — Angola's first pre-salt find — lies in Block 23, one of three exploration tracts up for grabsNearby: Azul-1 was found just offshore Porto Amboim, Angola where the N'Goma FPSO arrived in 2014 before going to location in Block 15/06Photo: SBM OFFSHORE/ANGOLA IMAGE BANKIain EsauLondon