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尽管影响低幅度构造成图精度的因素很多，但在消除了闭合差和实现了准确的层位标定与追踪情况下，真实合理的变速速度场的建立则成为最为重要的因素。用深度经基准面校正后的钻井资料确定的油水界面和圈闭溢出点深度与等ｔ０图上的溢出点位置及对应的ｔ０值，可推算一个溢出点平均速度。在钻井平均速度控制点少或分布不匀的情况下，由溢出点平均速度和井点平均速度对地震叠加速度推导出的平均速度约束校正可得到一个较合理的变速速度场，由此所做的构造图将比无溢出点约束作出的构造图具有更精确的圈闭形态和闭合高度，为储量计算和开发井布置提供更可靠的依据。
Although there are many factors that affect the accuracy of low-amplitude structure mapping, the establishment of a true and reasonable speed-changing velocity field is the most important factor in eliminating closed gaps and achieving accurate horizon calibration and tracking. The depth of oil-water interface and trap overflow, the position of the overflow point on the contour map t0, and the corresponding t0 value, which are determined by the well-calibrated drilling data of depth, can be used to calculate the average speed of an overflow point. When the average drilling speed control point is little or unevenly distributed, a more reasonable speed variable velocity field can be obtained by adjusting the average velocity constraint derived from the average stacking velocity and the well point average velocity. The constructed map will have a more accurate trap shape and closure height than the tectonic map without spillover constraint, which provides a more reliable basis for reserves calculation and development well layout.