PetroChina Co. (PTR), China's biggest listed oil firm by capacity, doesn't have a "discloseable" comment on whether it's bidding for Repsol YPF SA's (REP) stake in its Argentine unit YPF, PetroChina President Zhou Jiping said Friday.

"We are interested in the energy assets in South America," Zhou said, without elaborating.

At the same conference, Zhou said PetroChina is interested in bidding for more Iraqi oil fields in the second round of bidding scheduled in December, after winning a joint bid with BP PLC (BP) for the Rumaila field in southern Iraq during the first round in late June.

"We will likely do that (in the second round) in a joint venture," he said, without revealing the company's partner.

In the second round of bidding, 10 oil fields and one gas field in Iraq will be on offer.

-By Yvonne Lee, Dow Jones Newswires; 852-2802-7002; yvonne.lee@dowjones.com