A shale formation with sandstone interbedded is also a potential oil bearing formation.
以泥岩为主,夹砂岩的地层也可能是油气层.
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介绍了一种复合式PDC钻头,该钻头在多夹层地层钻井施工中取得了较好的试验效果.
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Interbedded with the salt were thin layers of what appeared to be windblown silt.
跟结晶盐相互嵌在一起的薄层像是被风吹起的泥沙层.
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中更新世:砾石层;砂、粗砂与砾石层互层;砾石层。
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