初次运移（primary migration）是指油气运移的第一阶段，泛指烃源层中新生的油气，经历排烃阶段，运移进入储集层的过程。
连续油相是最主要的石油初次运移相态。
The continuous oil phase is the main phase of primary migration.
初次运移的动力主要是异常高压，二次运移的动力主要是浮力和流体势差。
The driving force of primary migration is mainly abnormal high pressure and that of secondary migration is buoyance and fluid potential difference.
作者于1982年提出了油气初次运移量的计算公式并对几个盆地进行了试算。
A certain formulae of Primary migration amounts of oil was developed and some calculations were done for a few basins in 1982.
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