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顶积层与斜坡沉积盆地边缘体系的前积与退积旋回受控于沉积物供给速率与顶积层容积产生速率之间的平衡关系。其中后者被定义为顶积层面积与相对海平面上升速率之乘积。如果体系是渐变的,砂则优先截留在体系的近源部分,即顶积层中砂的百分含量受砂供给速率与顶积层容积产生速率的控制。顶积层容积大的体系域其顶积层的含砂量将会比顶积层容积小的体系域的顶积层的含砂量相对要少些,而且任何一个层序中顶积层的含砂百分量均具系统性变化特点。 与顶积层有关的成藏组合类型受储、盖层中顶积层的相对丰度的影响颇大。不同的盆地类型用不同的顶积层成藏组合类型来表征。
The pre-accretion and degenerated cycles of the top-margin and marginal systems of the slope-sedimentary basin are controlled by the equilibrium relationship between sediment supply rate and top-layer volumetric production rate. The latter is defined as the product of the area of the top-landed and the relative sea-level rise. If the system is graded, the sand preferentially intercepts the near-source part of the system, ie the percentage of sand in the top layer is governed by the rate of sand supply and the rate at which the top layer volume is produced. The sediment volume of the top lamellae of the top lamination volume system will be less than that of the top lamellae of the top lamellae with a smaller volume than that of the top lamellae, The percentages of sand contain systematic changes. The types of reservoir assemblages associated with the top-layer are greatly influenced by the relative abundance of the top-layer in the reservoir and caprock. Different types of basins are characterized by different types of top-fill assemblages.