Former Nigerian oil minister Diezani Alison-Madueke was on Wednesday found not guilty by a London jury of six bribery charges, after a rare corruption trial of a high-profile former energy official.

Alison-Madueke, minister for petroleum resources between 2010 and 2015 under then-president Goodluck Jonathan, stood trial charged with five counts of accepting bribes and a charge of conspiracy to commit bribery, which she denied.

Prosecutors alleged Alison-Madueke, 65, was given "a life of luxury" in London from oil and gas industry figures seeking lucrative contracts in Nigeria, which has long grappled with mismanagement and corruption.

But the former minister, who was also briefly president of the Organization of the Petroleum Exporting Countries, said she never took any bribes and had no real influence over the awarding of lucrative government contracts.

After a trial at London's Southwark Crown Court, Alison-Madueke was acquitted of all six charges she faced.