In this work, we perform streaming potential measurements for consolidated rocks saturated by three divalent electrolytes at different electrolyte concentrations. From the measured streaming potential, we obtain an empirical relation between the streaming potential coefficient and the electrolyte concentration for divalent electrolytes that is not yet available in published work. It is seen that the obtained expression has a similar form to those reported in literature for monovalent electrolytes. The variation of the streaming potential coefficient with rocks can be qualitatively explained by the difference in mineral compositions. |