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<publisher>HAL CCSD</publisher>
<title lang=en>MuSET: A multiparameter and high precision sensor for downhole spontaneous electrical potential measurements</title>
<creator>Pezard, Philippe</creator>
<creator>Gautier, Stéphanie</creator>
<creator>Le Borgne, Tanguy</creator>
<creator>Legros, Bruno</creator>
<creator>Deltombe, Jean-Luc</creator>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Rennes (GR) ; Université de Rennes 1 (UR1) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre Armoricain de Recherches en Environnement - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Advanced Logic Technology (ALT)</contributor>
<source>ISSN: 1631-0713</source>
<source>Comptes Rendus Géoscience</source>
<publisher>Elsevier Masson</publisher>
<identifier>hal-00445251</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00445251</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00445251</source>
<source>Comptes Rendus Géoscience, Elsevier Masson, 2009, 341 (10-11), pp.957-964. 〈10.1016/j.crte.2009.07.009〉</source>
<identifier>DOI : 10.1016/j.crte.2009.07.009</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.crte.2009.07.009</relation>
<language>en</language>
<subject lang=en>Spontaneous potential</subject>
<subject lang=en>Downhole experiments</subject>
<subject lang=en>Electrokinetic potential</subject>
<subject lang=en>Electrochemical potential</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>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.</description>
<date>2009</date>
</dc>
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