then that of the subaqueous distributary channel sand bodies,diaras and river mouth bars is secondary;that of river mouth sand bars of deltaic front subfacies is the last.

• 三角洲平原亚相的辫状河道砂体物性最好，水下分流河道砂体、心滩砂体次之，三角洲前缘亚相的河口坝砂体最差。