The main sedimentary microfacies comprise distributary channel, mouth bar, distal bar, blanket sand, natural levee and crevasse splay.
主要沉积微相为水下分流河道、河口坝、远砂坝、席状砂、天然堤、决口扇等。
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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