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。
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.
一般而言，泥质砂岩、砂质泥岩的波阻抗值较大，泥岩波阻抗值较小，而砂岩介于两者之间。
Generally, values of wave impedance in argillaceous sandstone and sandy mudstone are relatively large, while that in mudstone is relatively small, and that in sandstone is situated between the two.
赋存稳定，结构简单，煤种为FM、JM，煤层顶板为石灰岩、粉砂岩，底板为泥质粉砂岩、砂质泥岩；
The occurrence is steady and the structure is simple with FM, JM types of coal, whose roof is limestone and siltstone and bottom is muddy siltstone and sandy mudstone;
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