沙楔(sand wedge), 此释义来源于网络辞典。
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研究表明：该凹陷沙三段层序低位域砂体发育下切水道充填，低位楔和低位扇。
The research shows that the lowstand sand bodies of the third member of the Shahejie Formation in the depression consist of incised channel deposits, lowstand wedges, and lowstand fan deposits.
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