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Transient electric phenomena observed during fluid circulation in unsaturated porous media
Author(s) -
Hovhannissian G. M.,
Pozzi J.P.,
Bernard P.,
Tabbagh A.
Publication year - 2002
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2001gl013483
Subject(s) - electrokinetic phenomena , porous medium , transient (computer programming) , porosity , amplitude , fluid dynamics , mechanics , electric current , streaming current , materials science , geology , physics , geotechnical engineering , optics , quantum mechanics , computer science , nanotechnology , operating system
We conducted a series of electrokinetic measurements on partially saturated sandstone samples. Both steady and transient electric signals were observed. We recorded transient electric signals with frequencies of 0.5–2Hz and amplitudes 10–100 times smaller than the quasi‐DC streaming potential, which we associate with fluid flow instabilities in the unsaturated porous rocks samples. Some of these electric signals were correlated with fluid pressure variations, delayed by one to a few seconds.