PetroChina's overseas operations chief Bo Qiliang is under official investigation after being removed from his post, a company source with knowledge of the matter told Reuters.
Earlier on Friday, PetroChina said in a filing with the Shanghai Stock Exchange that Bo had left his post due to a change in job role, but did not give a reason.
Bo will be replaced by Lu Gongxun, the former head of PetroChina in Kazakhstan.
PetroChina spokesman Mao Zefeng reiterated the stock exchange statement but declined further comment when asked by Reuters.
(Reporting by Charlie Zhu and Michael Martina; Editing by Alison Williams)