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.

• 在河道砂体内部构成的不同层次实体界面上，通常存在着4种隔挡层，即细粒物质隔挡层、泥砾隔挡层、植物碎屑隔挡层和成岩隔挡层。