The middle oil-member is characterized by medium-sized sandstone and pebbled sandstone, with fair sorting and subangular sphaericity.Rock types mainly were feldspar debris sandstone.
油组主要沉积砂岩和含砾砂岩，粒度整体较粗，分选性较好，磨圆度以次
角状为主，岩石类型为长石岩屑砂岩。
角形的The middle oil-member is characterized by medium-sized sandstone and pebbled sandstone, with fair sorting and subangular sphaericity.Rock types mainly were feldspar debris sandstone.
油组主要沉积砂岩和含砾砂岩，粒度整体较粗，分选性较好，磨圆度以次角状为主，岩石类型为长石岩屑砂岩。
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