According to Reuters, China National Petroleum Corp. (CNPC), the country's largest oil company, has offered to pay between $13.2 billion and $14.5 billion for a 75 percent stake in Spanish oil major Repsol's Argentine unit YPF, the South China Morning Post reported on Tuesday, citing sources. Executives from CNPC, the parent firm of Asian oil and gas producer PetroChina, has begun talks with Repsol over the offer, and the initial reaction from Repsol's board members has been receptive, the newspaper said. The bid is lower than the $17 billion offer that CNPC was prepared to make.