三种孔隙水的导电和介电性质及其频散特征

Electrical and dielectric properties of three types of pore water and their frequency dispersion characteristics

研究发现含水岩石的导电和介电性质具有频散特征,这种现象与岩石中的孔隙水密切相关.三水模型中将岩石中的孔隙水分为自由水、微毛细水和黏土水,其中微毛细水和黏土水统称为束缚水.前人对自由水的导电和介电性质的研究,主要是利用相同浓度的盐水来模拟,而束缚水由于具有不可流动性,通过实验直接模拟几乎不可能实现.本文通过分析不同频率下岩石的导电和介电性质随含水饱和度的变化,发现低频下孔隙水的赋存状态对岩石导电及介电性质具有明显的影响,进而可以得到不同孔隙水的导电和介电性质.低频下孔隙水导电和介电性质的差异,对三种水饱和度的确定有一定的参考价值.

The study finds that the electrical and dielectric properties of water-bearing rocks have the property of frequency dispersion,this phenomena is closely linked with the pore water in the rock. The pore water in the rock is divided into free water,micro capillary water and clay water in the three-water model,among which the micro capillary water and the clay water can collectively be called the bound water. The previous research about electrical and dielectric property of free water is mainly simulated by salt water with the same concentrations,but because the bound water is immobile,it is almost impossible to simulate it directly by experiment. By analyzing the relationship between the electrical and dielectric properties of rocks and water saturation at different frequencies,this paper finds that the occurrence state of pore water has an obvious influence on the electrical and dielectric properties of rocks at low frequencies,and then the electrical and dielectric properties of different types of pore water can be obtained. The difference in the electrical and dielectric properties of pore water at low frequencies has some consultative value for determining the saturation of three types of water.