Four isolate barrier beds occurened usually in boundary surface of each internal architecture unit in channel sandbody, i. e. find bed, muddy pebble bed, plant clasts bed and diagenic bed.

在河道砂体内的不同层次实体界面，通常存在着4种隔挡层，物质隔挡层、泥砾隔挡层、植物碎屑隔挡层和岩隔挡层。