The reservoirs of the Yanchang formation almost are fine feldspathic sandstone, feldspathic debris sandstone, rock fragment feldspathic sandstone, and little quartzose sandstone.
延长组储集岩主要为细粒的长石砂岩、长石岩屑砂岩、岩屑长石砂岩等，还有少量的石英砂岩。
The reservoirs of the Yanchang formation almost are fine feldspathic sandstone, feldspathic debris sandstone, rock fragment feldspathic sandstone, and little quartzose sandstone.
延长组储集岩主要为细粒的长石砂岩、长石岩屑砂岩、岩屑长石砂岩等，还有少量的石英砂岩。
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