the reservoirs of the yanchang formation almost are fine feldspathic sandstone, feldspathic debris sandstone, rock fragment feldspathic sandstone, and little quartzose sandstone.
延长组储集巖主要为细粒的长石砂巖、长石巖屑砂巖、巖屑长石砂巖等,还有少量的石英砂巖。
there exist two types of organic inclusions in the quartzose grain cracks of oil sandstone reservoir in lukeqin structural belt, turpan-hami basin.