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通过对陕 141井区上古生界山 2储层的毛管压力曲线和岩电实验资料的研究 ,认为阿尔奇公式中的电阻率因素F不但与储层孔隙度、孔隙的曲折度有关 ,而且与储层的孔喉比有关 ,当孔隙度一定时 ,孔喉比越小 ,F值越低 ;地层电阻率指数n值的大小主要受储层孔喉比的影响 ,当储层为孔喉比等于 1的管状孔时 ,n等于 1,值最小。孔喉比越大 ,n值越大。其原理是当孔隙饱含油时 ,不仅导电体截面减小 ,而且导电体长度增加。
Based on the capillary pressure curves and the experimental data of the Upper Paleozoic Shan 2 reservoir in Shaan-141 well area, it is considered that the resistivity factor F in the Archie formula is not only related to the reservoir porosity and the tortuosity of the pores, When the porosity is constant, the smaller the ratio of pore to throat, the lower the F value. The value of the formation resistivity index n is mainly affected by the pore throat ratio of the reservoir. When the reservoir is pore throat ratio Equal to 1 tubular hole, n is equal to 1, the minimum value. The greater the pore throat ratio, the greater the value of n. The principle is that when the pores are full of oil, not only the cross section of the conductor is reduced, but also the length of the conductor is increased.