Review of induced polarization mechanisms and models in saturated porous media without metal minerals
Laboratory research has found that the induced polarization parameters of saturated porous media without metal minerals are influenced by rock physical properties.Establishing a quantitative relationship between low-frequency complex conductivity(＜106 Hz)at the core scale and factors such as pore structure parameters and fluid properties are great guiding significance for interpreting induced polarization data.However,the cause of induced polarization effect has not yet formed a unified understanding of physical/chemical process,existing theories have not fully explained induced polarization data,and the quantitative relationship between induced polarization parameters and structural parameters of porous media lacks in-depth mechanism research.Therefore,this paper first elaborates on the electrical double layer theory and the mechanisms used to explain induced polarization effects,including Stern layer polarization,membrane polarization,Maxwell-Wagner polarization,and electrokinetic effects;Secondly,the latest developments in existing induced polarization models were summarized,including equivalent circuit models,Stern layer polarization models,membrane polarization models,and effective medium models;The review shows that:(1)there is still no unified understanding of the micro mechanism of low-frequency induced polarization effect,and both membrane polarization and Stern layer polarization models can explain low-frequency induced polarization data under specific conditions;(2)There is still controversy over whether the characteristic relaxation time is controlled by pore size or particle size.
万方数据
维普
