Streaming potential during drainage and imbibition

Jiazuo Zhang (Corresponding Author), Jan Vinogradov, Eli Leinov, M. D. Jackson

Research output: Contribution to journalArticle

2 Citations (Scopus)
6 Downloads (Pure)

Abstract

The rock pore space in many subsurface settings is saturated with water and one or more immiscible fluid phases. Examples include non-aqueous-phase liquids (NAPLs) in contaminated aquifers, supercritical CO2 during sequestration in deep saline aquifers, the vadose zone, and hydrocarbon reservoirs. Self-potential (SP) and seismo-electric (SE) methods have been proposed to monitor multiphase flow in such settings. However, to properly interpret and model these data requires an understanding of the saturation dependence of the streaming potential. This paper presents a methodology to determine the saturation dependence of the streaming potential coupling coefficient (C) and streaming current charge density (Qs) in unsteady-state drainage and imbibition experiments and applies the method to published experimental data. Unsteady-state experiments do not yield representative values of C and Qs (or other transport properties such as relative permeability and electrical conductivity) at partial saturation (Sw) because Sw within the sample is not uniform. An interpretation method is required to determine the saturation dependence of C and Qs within a representative elementary volume with uniform saturation. The proposed method makes no assumptions about the pore-space geometry.Application of the method to published experimental data from two natural sandstone samples shows that C exhibits hysteresis between drainage and imbibition, can exhibit significant non-monotonic variations with saturation, is non-zero at the irreducible water saturation, and can exceed the value observed at Sw = 1. Moreover, Qs increases with decreasing Sw but is not given by 1/Sw as is often assumed. The variation in Qs with Sw is very similar for a given sample and a given drainage or imbibition process, and the difference between samples is less than the difference between drainage and imbibition. The results presented here can be used to help interpret SP and SE measurements obtained in partially-saturated subsurface settings.
Original languageEnglish
Pages (from-to)4413-4435
Number of pages23
JournalJournal of Geophysical Research: Solid Earth
Volume122
Issue number6
Early online date28 Jun 2017
DOIs
Publication statusPublished - Jun 2017

Fingerprint

streaming potential
imbibition
drainage
Drainage
saturation
Aquifers
Groundwater
unsteady state
Electric variables measurement
aquifers
self potential
pore space
Water
Multiphase flow
nonaqueous phase liquids
Hydrocarbons
sampling
Charge density
Sandstone
methodology

Keywords

  • Instruments and techniques: modeling
  • Electrical properties
  • Magnetic and electrical properties
  • streaming potential
  • streaming charge density
  • sandstones
  • self-potential
  • multiphase

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Agricultural and Biological Sciences(all)

Cite this

Streaming potential during drainage and imbibition. / Zhang, Jiazuo (Corresponding Author); Vinogradov, Jan; Leinov, Eli; Jackson, M. D.

In: Journal of Geophysical Research: Solid Earth, Vol. 122, No. 6, 06.2017, p. 4413-4435.

Research output: Contribution to journalArticle

Zhang, Jiazuo ; Vinogradov, Jan ; Leinov, Eli ; Jackson, M. D. / Streaming potential during drainage and imbibition. In: Journal of Geophysical Research: Solid Earth. 2017 ; Vol. 122, No. 6. pp. 4413-4435.
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note = "TOTAL are thanked for partially funding Jackson under the TOTAL Chairs programme at Imperial College London and for funding Vinogradov. Shell are thanked for funding Leinov. The Department of Earth Science and Engineering at Imperial College London are thanked for supporting Zhang with a Janet Watson Scholarship. Damien Jougnot, Frederic Perrier and an anonymous reviewer are thanked for their careful and thorough reviews. The data for this paper are available in supporting information or by contacting the corresponding author m.d.jackson@imperial.ac.uk.",
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N2 - The rock pore space in many subsurface settings is saturated with water and one or more immiscible fluid phases. Examples include non-aqueous-phase liquids (NAPLs) in contaminated aquifers, supercritical CO2 during sequestration in deep saline aquifers, the vadose zone, and hydrocarbon reservoirs. Self-potential (SP) and seismo-electric (SE) methods have been proposed to monitor multiphase flow in such settings. However, to properly interpret and model these data requires an understanding of the saturation dependence of the streaming potential. This paper presents a methodology to determine the saturation dependence of the streaming potential coupling coefficient (C) and streaming current charge density (Qs) in unsteady-state drainage and imbibition experiments and applies the method to published experimental data. Unsteady-state experiments do not yield representative values of C and Qs (or other transport properties such as relative permeability and electrical conductivity) at partial saturation (Sw) because Sw within the sample is not uniform. An interpretation method is required to determine the saturation dependence of C and Qs within a representative elementary volume with uniform saturation. The proposed method makes no assumptions about the pore-space geometry.Application of the method to published experimental data from two natural sandstone samples shows that C exhibits hysteresis between drainage and imbibition, can exhibit significant non-monotonic variations with saturation, is non-zero at the irreducible water saturation, and can exceed the value observed at Sw = 1. Moreover, Qs increases with decreasing Sw but is not given by 1/Sw as is often assumed. The variation in Qs with Sw is very similar for a given sample and a given drainage or imbibition process, and the difference between samples is less than the difference between drainage and imbibition. The results presented here can be used to help interpret SP and SE measurements obtained in partially-saturated subsurface settings.

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