Supermajor Shell has hit oil in a high-profile wildcat that is targeting a billion-barrel reward offshore Namibia, with four exploration sources familiar with the Graff-1 probe stating that it has found light oil.

Shell is understood to have had two geological targets for the probe in Upper Cretaceous sands, with the basin’s older Lower Cretaceous Aptian play — a traditional objective — thought not to be on the supermajor’s radar.