偏移速度是影响偏移效果的关键因素。
Migration velocity is the key factor which influences the migration result.
这正是目前波动方程偏移效果不太理想的根本原因。
This essentially is the very reason why the effect of wave equation migration is undesirable at present moment.
地震时间剖面的数字偏移程序不但要有较好的偏移效果，还要求运算速度快，否则其应用要受到限制。
For the digital migration program of time section, it is required not only the better results but also the high speed of calculation, or its application will surely be restricted.
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