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.

河道砂体内部构成的不同体界面，通常存4隔挡，即细粒物质隔挡、泥砾隔挡、植物碎屑隔挡和成岩隔挡。