有效孔隙度（n）=重力水流动孔隙体积（不包括结合水占据的空间）/岩石体积（V）×100% 岩石中互相连通的孔隙的体积与岩石总体积之比。又可以分为基质孔隙度和裂缝孔隙度。又可以分为基质孔隙度和裂缝孔隙度。
提出了一种测定岩样有效孔隙度的方法。
An improved method of measuring effective porosity of rock samples is presented.
然后由岩样的有效孔隙体积和骨架体积计算出岩样的有效孔隙度。
So the effective porosity is drawn from the matrix volume and effective pore volume.
致密岩层中由于大量裂缝存在形成了具有有效孔隙度和渗透率的储层。
Compact rock formation formed a available reservoir with effective porosity and permeability because there are a many of fractures in it.
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