The highest point of a trap is the crest,or culmination.The lowest point at which hydrocarbons may be contained in the trap is the spill point:this lies on a horizontal contour,the spill plane.

• 圈闭的最高点称为脊部或顶部。含有烃类的那部分圈闭的最低点称为溢出点。溢出点位于平面溢出面上。