... 隐伏冲积扇 concealed fan 河流冲积扇 river fan 漫滩冲积扇 overbank splay ...
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The natural levee, crevasse splay and overbank sand are difficult to be effective reservoir for their content of mud-bearing silt, silty mud and unmixed mud.
天然堤、决口扇、溢岸砂多为含泥粉砂、粉砂质泥和纯泥，很难成为有效储层。
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