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Weiyuan, the oldest gas field in China, is a rare example of the giant Neoproterozoic gas pools. This field is located in southwestern Sichuan Basin, with a proven in place gas reserve around 40 billion cubic meters (bcm) or 1.41 trillion cubic feet (tcf) in reservoirs of the Sinian Dengying Formation. This field is almost depleted now, with a cumulative gas production of 14.4bcm and a recovery factor...
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