河口坝与前缘砂坝接触，酸性水容易进入河口坝，河口坝砂体中的长石受酸性水溶蚀，形成次生孔隙。
The mouth bar contacts with the frontal sand bar and acidic water can easily flow into mouth bar. The feldspar in sand bodies of mouth bar is dissolved and generates secondary pores.
其中曲流河河道，三角洲前缘水下分流河道、分流河口砂坝、远砂坝以及滩坝是主要的砂体成因类型。
The channel of meandering river, the distributary channel of delta front , distributary mouth bar , distal bar and the beach bar are the main sand body types.
准噶尔盆地侏罗系属河流三角洲沉积体系，在盆地腹部发育三角洲前缘水下分流河道及河口坝等多类砂体。
The Jurassic of Junggar basin is a river delta sedimentary system, with subaqueous distributary channel and mouth bar sand body developed in the hinterland of Junggar basin.
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