Journal
COMPTES RENDUS GEOSCIENCE
Volume 341, Issue 10-11, Pages 957-964Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.crte.2009.07.009
Keywords
Spontaneous potential; Downhole experiments; Electrokinetic potential; Electrochemical potential
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On the basis of an existing multiparameter borehole fluid sensor(p, T Cw, pH, Eh), a new downhole tool designed for 200 bars and 75 degrees C was developed to measure the spontaneous electrical potential in situ with great precision (better than a mu V). To this end, the new sensor is based on the use of unpolarizable Pb/PbCl2 electrodes either at the surface or downhole. In situ testing has demonstrated a capacity to identify several subsurface sources of natural electrical potential such as diffusion ones (membrane potential in the presence of clays, Fickian processes due to pore fluid salinity gradients), or else the electrokinetic mechanisms with gradients in pore fluid pressure. As a consequence, Multi-Sensors Electrical Tool (MuSET) might be used as an electrical flow meter sensitive to both horizontal and vertical fluid flow in a vertical borehole. To cite this article: P.A. Pezard et al., C R. Geoscience 341 (2009). (C) 2009 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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