Sinopec Corp., China's largest oil refiner, saw its oil and gas output rise 4.83 percent year on year in 2012 to 427.62 million barrels of oil equivalent, according to preliminary data released Wednesday.

The company filed unaudited business data to the Shanghai Stock Exchange (SSE) on Wednesday showing that its crude oil production grew 2.04 percent to 328.28 million barrels last year.

About 93.4 percent of the crude oil was produced inside the country, while the remainder was produced elsewhere, according to the document.

Sinopec's natural gas output climbed 15.66 percent to 598.02 billion cubic feet.

The company refined 221.31 million tonnes of crude oil last year, up 1.81 percent from a year earlier.

The final audited data will be unveiled in the company's annual report, which is scheduled to be filed with the SSE on March 25.