So far permeability is referred to rock conditions where a single-phase fluid saturation was considered.
目前讲到的渗透率只涉及只考虑单相流体的饱和的岩石的条件。
Waterflood can cause variation not only in reservoir fluid saturation, but also in reservoir temperature and pressure.
注水不仅会引起储层流体饱和度的变化，而且会导致储层温度和压力的变化。
When rock porosity and fluid modulus are relatively small, compressional velocity is relatively more sensitive to variation of fluid saturation.
岩石孔隙度及流体模量较小时，纵波速度对流体变化比较敏感。
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