Dynamic streaming potential coupling coefficient in porous media with different pore size distributions

SUMMARY Seismoelectric signals are generated by electrokinetic coupling from seismic wave propagation in fluid-filled porous media. This process is directly related to the existence of an electrical double layer at interface between pore fluid and minerals composing walls. The seismoelectric method attracts interest researchers different areas, oil gas reservoir characterization hydrogeophysics, due sensitivity medium properties. In this work, we propose a physically based model for dynamic streaming potential coefficient (SPCC) conceptualizing as bundle tortuous capillaries characterized presenting size distributions (PSD). results show that complex function depending on properties fluid, mineral–pore interfaces, microstructural parameters media frequency. Parameters influencing SPCC investigated explained. particular, PSD affects transition frequency well shape response proposed then compared with published data previous models. It found approach using lognormal distribution very good agreement experimental Conversely, uses fractal provides match sandstone samples but not sand samples. result implies may be pertinent considered samples, which exhibit relatively narrow sizes. Our can work any PSD, example, including ones such porosity or inferred direct measurements. makes models more versatile than available literature.