Abstract:

Restricted by measuring method and accuracy,it is difficult to measure water saturation in rock porosity in Lab,the ways,such as CT,NMR are costly and not suitable to be applied frequently,After comparing resistivity logging and practical measuring data,it is found that in a certain range of concentration,there is a linear relationship between solution resistivity value and ion concentration,under the condition of reservoir,there is a linear relationship between rock resistivity value and the distance among probes,the water saturation value can be calculated by measuring the resistivity value.Research indicates in order to improve accuracy,two kinds of correcting,the relationship between solution concentration and resistivity value and the relationship between CT imaging value and resistivity value,must be carried on prior to experiment.The flooding experiment of plate model is conducted,which verifies the way can clearly reflected water-containing variation in different stage.Compared with other measuring ways,the way presented in this paper is easy to carry on and safer.

Key words: resistivity logging, rock resistivity, resistance, water saturation