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在裂隙性岩石中孔隙的几何形态及其分布与在粒状岩石中是很不相同的。在粒状岩石中孔隙从整体来说是均匀的,而在裂隙性岩石中孔隙是局部分布在个别角落里的。如果粒状岩石的个别岩心能表征其渗透性的话,那末对于裂隙性岩石来说,即使采集了大量岩心也较难估价其岩石物理性质。为了研究裂隙性岩石需要特殊的仪器和方法。 裂隙性岩石是不够牢固的,在预先机械加工时常常容易遭到破坏,因此应该根据其从钻井中取上来的原有状态来研究渗透率。 考虑到裂隙性岩石的特点和大小,设计制造了E-P型的特殊仪器,用来测量直径为29～92mm,高为60～160mm岩心的渗透率(见图)。
The geometry and distribution of pores in fractured rocks is very different from that in granular rocks. Pores are generally uniform in granular rock, while in fractured rock pores are locally distributed in individual corners. If individual cores of granular rocks can characterize their permeability, it is more difficult for fractured rocks to assess their petrophysical properties even if a large number of cores are collected. In order to study fractured rocks, special instruments and methods are needed. Fractured rocks are not strong enough and are often prone to damage during pre-machining, so permeability should be studied based on what they were from the well. Taking into account the characteristics and size of the fractured rock, E-P special instruments were designed and manufactured to measure the permeability of cores 29 to 92 mm in diameter and 60 to 160 mm in height (see figure).