Auxiliary material for
Experimental measurements of the self-potential (SP) response to concentration and
temperature gradients in sandstones with application to subsurface geophysical monitoring.
Eli Leinov & Matthew D. Jackson
(Dept. Earth Science & Engineering, Imperial College London, SW7 2AZ, UK)
Journal of Geophysical Research, Solid Earth, 2014
Introduction
This data set contains physical measurements of thermoelectric-exclusion-diffusion (TED)
and electrochemical-exclusion-diffusion (EED) apparent potentials in the laboratory. The
electrical potential measurements were obtained using a pair of non-polarising Ag/AgCl
electrodes, temperatures were measured using T-type thermocouples and concentration were
extracted from conductivity measurements. The measurements were performed over the
course of 2009-2011. Measurements data is given in Tables ts01-ts04. In addition, the data
set contains frequency distribution of pore-throat radii of the sandstone samples used in this
study measured using mercury injection method is given in Table ts05.
1.
ts01.docx TED potential measurements in the ‘column’ experiment are given in the in
support of Fig. 3a; values presented are obtained after the subtraction of reference values.
1.1 Row “NaCl concentration”, concentration values, ranging 0.0001-1M.
1.2 Columns “ΔT”, temperature difference.
1.3 Columns “ΔVAC”, mV, electrical potential.
2. ts02.docx EED potential measurements in the ‘column’ experiment are given in support
of Fig. 3b.
2.1 Row “series”, base concentration values in three series: 0.1, 0.57, 1.11M.
2.2 Columns “C1”, M, concentration value in the bottom compartment.
2.3 Columns “C2”, M, concentration value in the top compartment.
2.4 Columns “C1/ C2”, concentration ratio.
2.5 Columns “ΔVAC”, mV, electrical potential.
3.
ts03.docx TED potential measurements in the ‘plug’ experiment on Doddington sample
are given in support of Fig. 4c; values presented are obtained after the subtraction of
reference values.
3.1 Row “NaCl concentration”, concentration values, ranging 0.0001-1M.
3.2 Columns “ΔT”, temperature difference.
3.3 Columns “ΔVAP”, mV, electrical potential.
4.
ts04.docx EED potential measurements in the ‘plug experiment are given in support of
Fig. 6b.
4.1 Row “series”, base concentration values in three series: 0.1, 0.5M.
4.2 Columns “C1”, M, concentration value.
4.3 Columns “C2”, M, concentration value.
4.4 Columns “C1/ C2”, concentration ratio.
4.5 Columns “ΔVAP”, mV, electrical potential.
5.
t05.docx Frequency distribution of pore-throat radius data measured using mercury
injection method in the sandstone samples used in this study, in support of Fig. 9.
5.1 Header, “Doddington”; “Stainton”; “St. Bees”, sample name.
5.2 Columns “Norm. Pore Size Dist. Funct.”, Normalised pore size distribution function.
5.3 Columns “Pore throat rad.”, μm, Pore throat radius.