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.
在一般条件下（如一次采油、二次采油、侵入时）流体流经岩石时不能移动的原油。
Oil that does not move when fluids are flowed through the rock in normal conditions, for example primary and secondary recovery, and invasion.
共沉淀法制备的磁性颗粒经二次分散后稳定悬浮于硅油中，得到了硅油基磁流体。
The magnetic particles prepared through coprecipitation suspend stably in the fluid of polydimethylsiloxane after twice dispersing, and so the polydimethylsiloxane based ferrofluid is prepared.
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