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.
中油组
要沉积中砂
和含砾中砂，粒度整体较粗，分选性较
，
度以次
角状为，
类型为长屑砂。
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.
中油组要沉积中砂和含砾中砂，粒度整体较粗，分选性较，度以次角状为，类型为长屑砂。
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