进积作用,又称顺流加积,是指主要是指河流所携带的沉积物在遇到地形突然开阔、坡度变陡时,所形成的顺流向沉积作用,即沉积物在地形开阔和坡度增加的部位,开始卸载并逐渐向前推进或堆积的过程。
前三角洲斜坡发育重力流的主要控制因素是三角洲的快速进积作用和前三角洲斜坡自身存在的二元结构。
The controlling factors for the development of gravity-flow deposits on prodelta slope are deltaic progradation and the double-layer structure of the slope.
强制性水退机制作用下形成的砂体大都沉积在沉积滨线坡折带以下的齐家—古龙凹陷内,并逐渐向盆地方向进积迁移。
The sand bodies formed under the mechanism of forced regression are mostly deposited in Qijia-Gulong depression, and they prograde towards the basin gradually.
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