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
和含砾中，粒度
粗，分选性好，磨圆度以次
角状为主，石类型为长石
。
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.
中油组主要沉积中和含砾中，粒度粗，分选性好，磨圆度以次角状为主，石类型为长石。
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