Low temperature dependence of electrical resistivity: Implications for near surface geophysical monitoring

Low temperature dependence of electrical resistivity: Implications for near surface geophysical monitoring

Electrical resistivity imaging surveys are used to monitor variations in pore fluid chemistry and saturation as well as time‐lapse changes. Temperature variations in the near surface can produce larger magnitude changes in electrical conductivity than changes due to slow moving solute plumes or spat...

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Veröffentlicht in:Geophysical research letters 2007-09, Vol.34 (18), p.n/a
Hauptverfasser: Hayley, Kevin, Bentley, L. R., Gharibi, M., Nightingale, M.
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Earth sciences
Earth, ocean, space
electrical conductivity
Exact sciences and technology
temperature
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container_title Geophysical research letters
container_volume 34
creator Hayley, Kevin
Bentley, L. R.
Gharibi, M.
Nightingale, M.
description Electrical resistivity imaging surveys are used to monitor variations in pore fluid chemistry and saturation as well as time‐lapse changes. Temperature variations in the near surface can produce larger magnitude changes in electrical conductivity than changes due to slow moving solute plumes or spatial variations in chemistry and soil moisture. Relationships between temperature and electrical conductivity based on previous studies conducted over 25–200°C do not explain 0–25°C laboratory data. A modification to the temperature dependence within a petrophysical model is proposed that may allow general application over this temperature range. An empirical linear approximation of 1.8 to 2.2 percent change in bulk electrical conductivity per degree C is consistent with low temperature electrical conductivity studies and the predictions of the petrophysical model used. This relationship can be used to account for the effect of temperature variations within individual images or time‐lapse difference images.
doi_str_mv 10.1029/2007GL031124
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subjects Earth sciences
Earth, ocean, space
electrical conductivity
Exact sciences and technology
temperature
title Low temperature dependence of electrical resistivity: Implications for near surface geophysical monitoring
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