@article{Jackson:2012:2012/897807,
author = {Jackson, MD and Leinov, E},
doi = {2012/897807},
journal = {International Journal of Geophysics},
title = {On the Validity of the “Thin” and “Thick”Double-Layer Assumptions When CalculatingStreaming Currents in Porous Media},
url = {http://dx.doi.org/10.1155/2012/897807},
volume = {2012},
year = {2012}
}

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TY  - JOUR
AB  - We find that the thin double layer assumption, in which the thickness of the electrical diffuse layer is assumed small comparedto the radius of curvature of a pore or throat, is valid in a capillary tubes model so long as the capillary radius is >200 times thedouble layer thickness, while the thick double layer assumption, in which the diffuse layer is assumed to extend across the entirepore or throat, is valid so long as the capillary radius is >6 times smaller than the double layer thickness. At low surface chargedensity (<10 mC · m−2) or high electrolyte concentration (>0.5 M) the validity criteria are less stringent. Our results suggest thatthe thin double layer assumption is valid in sandstones at low specific surface charge (<10 mC · m−2), but may not be valid insandstones of moderate- to small pore-throat size at higher surface charge if the brine concentration is low (<0.001 M). The thickdouble layer assumption is likely to be valid in mudstones at low brine concentration (<0.1 M) and surface charge (<10 mC·m−2),but at higher surface charge, it is likely to be valid only at low brine concentration (<0.003 M). Consequently, neither assumptionmay be valid in mudstones saturated with natural brines.
AU  - Jackson,MD
AU  - Leinov,E
DO  - 2012/897807
PY  - 2012///
SN  - 1687-8868
TI  - On the Validity of the “Thin” and “Thick”Double-Layer Assumptions When CalculatingStreaming Currents in Porous Media
T2  - International Journal of Geophysics
UR  - http://dx.doi.org/10.1155/2012/897807
UR  - http://www3.imperial.ac.uk/people/m.d.jackson
UR  - http://hdl.handle.net/10044/1/23789
VL  - 2012
ER  - 

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