PetroChina witnessed its core upstream and downstream businesses progress on track during the first half of this year, according to information released by the country's top oil and gas producer yesterday .

"Key operational data released by PetroChina is almost all in line with its original plan, despite the fact its natural gas production falls a little bit short of the market expectation," said Liu Gu, a senior energy analyst withGuotai Jun'an Securities.

"But that will not affect PetroChina's business operation as a whole from January to June, because the firm's other operational data looks satisfactory," Liu added.