Investigators dig deeply into CNPC operations

China's ongoing anti-corruption investigations into officials who have close ties to China National Petroleum Corp, the country's oil giant, may affect the company's business operations and a billion-dollar project in Canada, experts said.

CNPC, China's largest oil and gas producer, acquired a Canadian oil sand project named Dover for $1.23 billion in February through its subsidiary in Canada.

The transaction is ongoing, and experts familiar with the sale said the delay is due to corruption probes into CNPC's senior officials in its overseas units.