PetroChina, the nation's largest oil producer, said on Tuesday it had prepared 20,000 tones of fuel for shipment to assist quake relief work in Japan, Xinhua reported.

The 10,000 tones of gasoline and 10,000 tones of diesel produced by PetroChina's Dalian Petrochemical are in port and will be shipped to Japan after procedures are completed.

No specific date for the shipment is set.

China's fuel assistance to Japan is in response to requests made by the Japanese government. China had previously sent emergency humanitarian aid worth 30 million yuan to Japan.