关键词: 储层, 岩石电性, 电阻率指数, 地层水矿化度, 饱和度指数, 逾渗网络模型

Abstract: A percolation network model for expressing pore structure and fluid characteristics of reservoir was developed.The effects of size and shape of pores,connectivity and the amount of micropores in reservoirs on the relative curve of the resistivity index I with the water saturation S_w were simulated by numerical modeling.The effects of formation water salinity on the rock resistivity were discussed.The relative magnitude of the different influencing factor was analyzed.The quantitative simulation of the different factors affecting the I—S_w curve shows that the connectivity of the void space and the amount of micropores have the greater effect on the I—S_w curve than other factors.The salinity of formation water has a great effect on the absolute resistivity value.The non-archie phenomenon is prevalent and remarkable in reservoir rocks with low permeability.

Key words: reservoir, rock resistivity, resistivity index, formation water salinity, saturation exponent, percolation network model