66 years ago today, September 25, 1959 (August 23, 1959), Daqing Oilfield was discovered in China. In 1960, the state organized the Battle for the Development of Daqing Oilfield. The picture shows the Battle Headquarters holding an oilfield technology symposium at the oil production site. On September 25, 1959, the China petroleum exploration team found industrial oil flows in the continental sediments of the Songliao Basin in Northeast China. It is the 10th anniversary of the National Day, so this oil field is named after "Daqing". The discovery of the Daqing Oilfield broke the argument that China is a "oil-poor country." Before liberation, China had only three small oil fields: Laojunmiao in Gansu, Dushanzi in Xinjiang, and Yanchang in Shaanxi, and two gas fields: Shengdengshan and Youyou Gou in Sichuan. The annual output of crude oil was only more than 100,000 tons. Oil was basically imported from foreign countries. The development of Daqing Oilfield has significantly increased crude oil output. By December 1963, Zhou Enlai was finally able to proudly announce that China was now basically self-sufficient in the oil it needed, and the era when the China people used "foreign oil" was about to be gone forever. Li Siguang, a geologist in the 1960s, founded geomechanics that made important contributions to the discovery of oil in Daqing and other places