Physics – Geophysics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3119609d&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 19, CiteID L19609
Physics
Geophysics
11
Exploration Geophysics: Magnetic And Electrical Methods, Hydrology: Groundwater Hydrology, Mineral Physics: Electrical Properties, Physical Properties Of Rocks: Magnetic And Electrical Properties
Scientific paper
Stimulated fluid flow in geothermal reservoirs can produce surface Self-Potential (SP) anomalies of several mV. A commonly accepted interpretation involves the activation of electrokinetic processes. However we can not rule out electrochemical or electrothermal processes generated by the differences in chemical composition and temperature between the in-situ and injected fluids. We analyzed the relative contribution of electrokinetic, electrochemical and electrothermal potentials to the SP anomalies observed above the Soultz-sous-Forêts geothermal reservoir while injecting cold fresh water. We found that electrokinetic effects were dominant during the stimulation phase (injection rates larger than 30 kg s-1) and that electrochemical and electrothermal effects became significant at small injection rates (less than 10 kg s-1) and after shut-in.
Darnet Mathieu
Maineult Alexis
Marquis Guy
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