Brent crude futures were 94 cents, or 1.2%, higher at $79.63 a barrel at 0345 GMT, after settling 85 cents stronger at $78.69 on Thursday.
U.S. West Texas Intermediate crude futures were up 91 cents, or 1.2%, at $74.58 a barrel.
However, oil prices were on track to end the week lower, with both contracts down around 7% on a week earlier.
"China's reopening optimism, especially further stimulus measures to boost the property sector, is the main bullish factor for the oil prices, which has improved the demand outlook in the near year," said Tina Teng, an analyst at CMC Markets.
China, the world's largest crude oil importer, has abruptly ended its stringent zero-COVID policy, leading to a surge in COVID infections across the country.