Crude oil output came in at 16.1 million tonnes during the period, which saw 48.9 million tonnes of crude refined, up 0.4 percent year on year.
China is one of the world's largest oil purchasers, with about 60 percent of its oil consumption coming from imports.
In August, China consumed 28.41 million tonnes of refined oil products, up 5.9 percent year on year.
Meanwhile, natural gas output totaled 12.8 billion cubic meters, gaining 9.6 percent year on year.
China aims to increase domestic crude oil output to 200 million tonnes by 2020, while supply capacity for natural gas should exceed 360 billion cubic meters.
Major tasks for the oil industry include accelerating exploration to ensure domestic oil supply, speeding up construction of pipeline networks and developing clean alternatives.