Influence of particle-particle interaction on the induced-polarization response of non-conducting particles

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ID: 332054
2026
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Abstract
Summary Most geologic materials exhibit a low-frequency dispersion of the complex conductivity that can be used to investigate their petrophysical characteristics. This frequency-dependent behavior is caused by polarization processes on the microscale, which can be described and investigated by suitable mechanistic models. However, most existing models only consider the polarization of single particles and can only be upscaled using simplistic models. In particular, the effect of particle-particle interaction on the microscale is often neglected. We present numerical models of systems of two particles and of clusters of particles to investigate the effect of interaction between adjacent particles on the modeled complex-conductivity spectra. Due to numerical reasons, most of the simulations are done in 2d. We observe that the peak caused by the polarization of the individual particles is increased or decreased, depending on the orientation of the particles relative to the external electric field. For small distances between the particles, we also observe a membrane-like polarization of the particle-particle interspace when the particles are not aligned with the electric field. For clusters of particles, the membrane-like behavior manifests itself by several minor peaks related to the different length scales of these interspaces. An additional polarization process is present for finite particle clusters, that is related to the polarization of the cluster as a whole, which becomes the main polarization process when the distance between the particles is decreased to zero, i. e., neighboring particles are in direct contact to each other. In that case, the length scale of the individual particles only acts as surface roughness. Our modeling results clearly show that we must expect particle-particle interaction to significantly increase the complexity of the low-frequency polarization response. Therefore, interaction effects need to be taken into account by considering the detailed microscale structure of the pore space for the interpretation of complex-conductivity spectra of geological materials.
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Authors Dennis Kreith, B Brömer, J Wentzki, A Haji, M Bücker
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Journal geophysical journal international
Year 2026
DOI
10.1093/gji/ggag436
URL
https://doi.org/10.1093/gji/ggag436
Keywords Keywords not found

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