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.
中油组主要沉积中砂
和含砾中砂，粒度整体
粗，分选性
，
圆度以次
角状为主，
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.
中油组主要沉积中砂和含砾中砂，粒度整体粗，分选性，圆度以次角状为主，型为长屑砂。
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