The conclusions are the following: ① The reservoir-rock types in Yan-chang formation are mainly arkose, secondly litharenite and lithic arkose in low compositional maturity.

  • 结果表明:①该组砂体以长石砂岩为主,次为岩屑砂岩和长石质岩屑砂岩,矿物成熟度低;

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