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Wei, Wei; Cai, Jianchao; Hu, Xiangyun; Han, Qi
Geophysical research letters, 28 June 2015, Letnik: 42, Številka: 12Journal Article
Archie's equation is an empirical electrical conductivity‐porosity model that has been used to predict the formation factor of porous rock for more than 70 years. However, the physical interpretation of its parameters, e.g., the cementation exponent m, remains questionable. In this study, a theoretical electrical conductivity equation is derived based on the fractal characteristics of porous media. The proposed model is expressed in terms of the tortuosity fractal dimension (DT), the pore fractal dimension (Df), the electrical conductivity of the pore liquid, and the porosity. The empirical parameter m is then determined from physically based parameters, such as DT and Df. Furthermore, a distinct interrelationship between DT and Df is obtained. We find a reasonably good match between the predicted formation factor by our model and experimental data. Key Points An electrical conductivity model is derived based on fractal geometry Physical definitions of empirical parameters in Archie's equation are presented Predictions of proposed model show good correspondence with experimental data
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