China Petroleum & Chemical Corp., aka Sinopec, said Tuesday it has proved more unconventional natural gas resources in the Sichuan Basin as the country works to boost its domestic output. 

State-owned Sinopec said it proved another 34 billion cubic meters (Bcm) of gas reserves in the Zhongjiang field in the southwestern part of China. The company’s efforts bumped the total known gas reserves in the basin to 106 Bcm, or about 3.7 Tcf. It is the country’s first 100 Bcm production base, Sinopec said. 

“The Sichuan Basin is rich in ultra-deep natural gas and deep shale gas resources and is a main front for increasing natural gas reserves and production in the future,” Sinopec said. 

The Chinese government called on its national oil companies to start raising domestic...