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Article Dans Une Revue Journal of Applied Geophysics Année : 1999

The location of infinite electrodes in pole-pole electrical surveys: consequences for 2D imaging

Résumé

In 2D-multielectrode electrical surveys using the pole-pole array, the distance to 'infinite electrodes' is actually finite. As a matter of fact, the available cable length generally imposes a poor approximation of theoretical location of these electrodes at infinity. This study shows that in most of the cases, the resulting apparent resistivity pseudosection is strongly distorted. Numerical simulation validated by field test also shows that a particular finite array provides results that are as close as possible to the ones of the ideal pole-pole array. This is achieved when two conditions that are weaker than an Ž. infinite location are fulfilled: i the 'infinite electrodes' are placed symmetrically on both sides of the in-line electrodes with Ž. a spread angle of 308 and ii the length of 'infinite lines' is at least 20 times the greatest distance between in-line electrodes. The electrical 2D image obtained with this enhanced array is the least distorted one with respect to the pole-pole image. The apparent resistivities are generally underestimated, but this deviation is almost homogeneous. Though the shift cannot be determined a priori, the interpretation of such an image with direct or inverse software designed for pole-pole data provides an accurate interpretation of the ground geometry.
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Dates et versions

hal-02925674 , version 1 (30-08-2020)

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Henri Robain, Yves Albouy, Michel Dabas, Marc Descloitres, Christian Camerlynck, et al.. The location of infinite electrodes in pole-pole electrical surveys: consequences for 2D imaging. Journal of Applied Geophysics, 1999, 41, pp.313 - 333. ⟨10.1016/S0926-9851(99)00010-5⟩. ⟨hal-02925674⟩
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