Repsol YPF SA (REP) has received offers for its Argentinean unit YPF, though none of the offers are binding, the Spanish oil firm said Thursday in a regulatory filing.

The statement came after several news outlets reported that China National Petroleum Corp. is weighing up a bid for part of YPF.

"Repsol ....has received proposals of a different nature and from different companies," Repsol said. The company last year tried to float YPF on the stock exchange in Argentina, and has said it is studying accepting new partners in the unit.

Earlier Thursday, a person familiar with the matter told Dow Jones Newswires that China National Petroleum Corp. may bid for some of the Argentine assets. The option is being reviewed alongside other potential deals in South America, including a joint bid with France's Total SA (TOT) for oil assets in Venezuela's Orinoco heavy oil belt, said the person, declining to be named.

Separately, a report in the South China Morning Post Thursday, quoting unnamed sources, said CNPC may offer to buy up to three-quarters of YPF valued at about $17 billion. It also said China's third-largest oil producer by capacity Cnooc Ltd. (CEO) is eying a 25% stake in YPF.

Company Web site: www.repsol.com

-By Christopher Bjork, Dow Jones Newswires, +34-91-395-8123, christopher.bjork@dowjones.com