Changqing oilfield, China's largest oil and gas field, has produced over 50 billion cubic meters of natural gas so far this year, Changqing Oilfield Company said on Tuesday. Located in northwest China's Erdos Basin, Changqing was once considered a marginal oilfield with little development value.

With over 50 years of history, the oilfield has played an important role in safeguarding the country's energy security, supplying natural gas to several major cities, including Beijing and Tianjin. To date, Changqing Oilfield has produced more than 555 billion cubic meters of natural gas, equivalent to 720 million tonnes of standard coal, reducing carbon dioxide and other emissions by 1.956 billion tonnes.