Self Potential and Current Channelling*

Abstract

CULL, J.P. 1985, Self Potential and Current Channelling, Geophysical Prospecting 33, 46& 467.Anomalies in self potential (SP) are usually explained in terms of geochemical activity. However, there are other sources of current which cause complications in the interpretation. In particular, DC telluric currents can be generated outside the survey region. Contrasts in resistivity cause current channelling and secondary voltages can be induced by leakage. The effect can be demonstrated using network theory and internal sources can be emphasized by subtraction. Joint surveys are required to demonstrate correlations with apparent resistivity.

Influence of water pressure dynamics and fluid flow on the streaming‐potential response for unsaturated conditions

“…These observations are interpreted regarding the electrokinetic coupling, which also leads to seismoelectric conversion effects (Gao and Hu, 2010;Zyserman, Gauzellino, and Santos, 2010;Strahser et al 2011;Warden et al 2013;Zhu and Toksöz, 2013;Kröger, Yaramanci, and Kemna, 2014). Self-potential observations have been interpreted by direct modelling (Kilty, 1984;Cull, 1985;Jouniaux et al 1999;Pain et al 2005;Sheffer and Oldenburg, 2007) in the wavelet domain to identify the location and intensity of the source of groundwater flows (Moreau et al 1997;Gibert and Pessel, 2001;Sailhac, Darnet, and Marquis, 2004;Saracco et al 2007;Mauri, Williams-Jones, and Saracco, 2010;Warden et al 2012), as well as by using particle swarm optimization (Fernandez-Martinez, Garcia-Gonzalo, and Naudet, 2010). These models require a good understanding of the streaming potential coefficient (Ahmad, 1964;Bogoslovsky and Ogilvy, 1972;Jouniaux, Lallemant, and Pozzi, 1994;Pozzi and Jouniaux, 1994;Guichet, Jouniaux, and Catel, 2006) and the electrical resistivity (Bekri et al 2003;Jouniaux, Zamora, and Reuschlé, 2006).…”

“…; Zhu and Toksöz, ; Kröger, Yaramanci, and Kemna, ). Self‐potential observations have been interpreted by direct modelling (Kilty, ; Cull, ; Jouniaux et al . ; Pain et al .…”