China's rising number of motorists could be in line for sharp petrol price rises under a new state pricing scheme, dubbed the "crude price plus cost" method, for oil products.

Han Yongwen, secretary-general of the National Development and Reform Commission, said on Tuesday the commission, the nation's top economic planning agency, considered the trial operation of the new system would help put an end to heavy losses in the oil processing and petrochemical industries.

Industry observers believe the new system means domestic oil prices will become more closely linked to those on international markets, and consumers will have to bear bigger-margin price rises on imported oil.

Han said the "crude price plus cost" method was based on the Brent, Dubai and Minas crude oil prices, taking into account processing costs and possible opportunities for enterprises to profit.

A senior official with a Chinese oil processing company, which is preparing to launch an IPO (initial public offering) in Britain, said, "The news will send a signal to investment banks that our company will have a stable profitability. This will help secure a higher IPO price for the company."

China's rising car ownership has fueled demand for oil products. But the oil processors have failed to profit from the brisk sales, as prices of fuel oil are under rigid state control and international crude oil prices have been generally rising.

Sinopec, China's leading oil processing and petrochemical enterprise, relied on imports for three quarters of the total crude it processed a year. It was highly sensitive to price hikes on international crude markets. It often bought crude at a high price, but sold oil products at a low price, as prescribed by the state to stabilize the domestic market and safeguard consumers' interests.

Though the state subsidized the company substantially in 2005 and 2006, the move failed to stem losses for the oil refiner and petrochemicals producer.

Industry observers said China needed to build more oil processing facilities to meet mounting demand.