Details of the Abstract
| Title of paper |
Rock properties conducive to seismo-electric and electrokinetic effects |
| List of authors | V. Hallbauer-Zadorozhnaya |
| Affiliation(s) | Irkutsk National Research Technical University, Irkutsk, Russia |
| Summary |
Applying the wave equation and using the mathematical concepts of M.A.Biot (1959) on the movement of a liquid relative to a solid matrix for slow seismic waves and implementing the approach of R.N. Chandler (1971) on transient pressure inside a pore, the amplitude of the seismoelectric effect in porous rocks was calculated. The amplitudes of the seismoelectric effect were calculated for rocks with perfect, imperfect and absent connections between the liquid (in the pores) and the solid components of the rock matrix. It has been shown that the seismoelectric effect can only occur in rocks with an imperfect relationship between the above components, where, under the influence of a pressure gradient, the fluid in the pores begins to move relative to the solid components. This effect occurs in rocks with medium to high fluid movement permeability (sediments with low, medium and, partly, high permeability except for clays). An electrokinetic effect of the electro-osmotic type occurs in rocks with imperfect liquid connections between pores with radii of 5·10-6 to 1·10-4 m, which also corresponds to weakly, moderately and highly permeable rocks. Calculations have shown that the effects of induced polarization effect distorted TEM signals can only be detected where a decay constant of the induced polarization occurs in τ ~1μс÷n∙мс. range. |
| Session Keyword | 7.0 Electrical rock properties: computer, laboratory and field experiments, including anisotropy |
| File upload |
7.0_rock_properties_conducive_hallbauer-zadorohnaya_03.pdf
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