China's southwest region has built an atmospheric area with an annual output of 400 billion cubic meters. The Sichuan Basin is the main producer of natural gas in China, ranking first in China in terms of reserves and production capacity. The Southwest Oil and Gas Field has accelerated its natural gas production, put into operation more than 340 new wells. The self-developed Tieshanpo high-sulfur gas field has reached full production, achieving major breakthrough of "fewer wells and higher production" in the ultra-high sulfur gas field.