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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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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