The deep-gas reservoirs of China's western Sichuan Basin are in Members 2 and 4 of the Upper Triassic Xujiahe Formation. These reservoirs contain mid- to large-sized gas fields like Xinchang, Hexingchang, Qiongxi, Zhongba, and Bajiaochang. The favorable geological conditions for creating these fields include abundant source rock, well-developed reservoir rock, good preservation conditions, and structural traps.

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