High Quality Content by WIKIPEDIA articles! Okoro Oilfield is an oilfield located 12 kilometres (7.5 mi) offshore Nigeria in an average water depth of 14 metres (46 ft) in the eastern Niger Delta. The field is located in OML 112 block (formerly OPL 469). The Okoro Oilfield is operated by Afren who has 50% working interest and its local partner Amni has 50% interest also.