An analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow

The self-potential (SP) method is a passive geophysical method that relies on the measurement of naturally occurring electrical field. One of the contributions to the SP signal is the streaming potential, which is of particular interest in hydrogeophysics as it is directly related to both the water...

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Autores principales:	Soldi, Mariangeles, Jougnot, Damien, Guarracino, Luis
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2019
Materias:	Geofísica Hydrogeophysics Electrical properties Fractal and multifractals Permeability and porosity
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/124222
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-124222
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Geofísica Hydrogeophysics Electrical properties Fractal and multifractals Permeability and porosity
spellingShingle	Geofísica Hydrogeophysics Electrical properties Fractal and multifractals Permeability and porosity Soldi, Mariangeles Jougnot, Damien Guarracino, Luis An analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow
topic_facet	Geofísica Hydrogeophysics Electrical properties Fractal and multifractals Permeability and porosity
description	The self-potential (SP) method is a passive geophysical method that relies on the measurement of naturally occurring electrical field. One of the contributions to the SP signal is the streaming potential, which is of particular interest in hydrogeophysics as it is directly related to both the water flow and porous medium properties. The streaming current is generated by the relative displacement of an excess of electrical charges located in the electrical double layer surrounding the minerals of the porous media. In this study, we develop a physically based analytical model to estimate the effective excess charge density dragged by the water flow under partially saturated conditions. The proposed model is based on the assumption that the porous media can be represented by a bundle of tortuous capillary tubes with a fractal pore size distribution. The excess charge that is effectively dragged by the water flow is estimated using a flux averaging approach. Under these hypotheses, this new model describes the effective excess charge density as a function of saturation and relative permeability while also depending on the chemical and interface properties, and on petrophysical parameters of the media. The expression of the model has an analytical single closed-form which is consistent with a previous model developed from a different approach. The performance of the proposed model is then tested against previous models and different sets of laboratory and field data from the literature. The predictions of the proposed model fits fairly well the experimental data and shows improvements to estimate the magnitude of the effective excess charge density over the previous models. A relationship between the effective excess charge density and permeability can also be derived from the proposed model, representing a generalization to unsaturated conditions of a widely used empirical relationship. This new model proposes a simple and efficient way to model the streaming current generation for partially saturated porous media.
format	Articulo Preprint
author	Soldi, Mariangeles Jougnot, Damien Guarracino, Luis
author_facet	Soldi, Mariangeles Jougnot, Damien Guarracino, Luis
author_sort	Soldi, Mariangeles
title	An analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow
title_short	An analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow
title_full	An analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow
title_fullStr	An analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow
title_full_unstemmed	An analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow
title_sort	analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow
publishDate	2019
url	http://sedici.unlp.edu.ar/handle/10915/124222
work_keys_str_mv	AT soldimariangeles ananalyticaleffectiveexcesschargedensitymodeltopredictthestreamingpotentialgeneratedbyunsaturatedflow AT jougnotdamien ananalyticaleffectiveexcesschargedensitymodeltopredictthestreamingpotentialgeneratedbyunsaturatedflow AT guarracinoluis ananalyticaleffectiveexcesschargedensitymodeltopredictthestreamingpotentialgeneratedbyunsaturatedflow AT soldimariangeles analyticaleffectiveexcesschargedensitymodeltopredictthestreamingpotentialgeneratedbyunsaturatedflow AT jougnotdamien analyticaleffectiveexcesschargedensitymodeltopredictthestreamingpotentialgeneratedbyunsaturatedflow AT guarracinoluis analyticaleffectiveexcesschargedensitymodeltopredictthestreamingpotentialgeneratedbyunsaturatedflow
bdutipo_str	Repositorios
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An analytical effective excess charge density model to predict the streaming potential generated by unsaturated flow

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