[1069] - Rock properties influencing impedance spectra studied by lab measurements on porous model systems

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Volkmann, J., Klitzsch, N., Mohnke, O., Schleifer, N., 2013. Rock properties influencing impedance spectra studied by lab measurements on porous model systems.Proc. of International Symposium of the Society of Core Analysts, September 16 - 19, 2013, Napa Valley, California, USA, 419 - 424.
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Title(s):Main Title: Rock properties influencing impedance spectra studied by lab measurements on porous model systems
Description(s):Abstract: The wetting condition of reservoir rocks is a crucial parameter for the estimation of reservoir characteristics like permeability or residual saturation. Since standard methods are often costly, especially in terms of time, we aim at assessing wettability of reservoir rocks using impedance spectroscopy (IS), a frequency dependent measurement of complex electric resistivity. IS is sensitive to the electrochemical properties of the inner surface of rocks. These electrochemical properties on the other hand, are decisively influencing wettability. Unfortunately, besides wettability there are other parameters (e.g. pore/grainsize) influencing the impedance spectra of rocks. To be able to quantify the relative importance of parameters influencing rock IS response, we study model systems which consist of sintered porous silica beads of different sizes leading to samples with different pore sizes. The main advantage of using model system compared to natural rocks is its well-defined and uniform mineralogical composition and thus uniform electrochemical surface properties. In order to distinguish pore geometry, fluid electrochemistry and wettability (contact angle) effects on the IS properties we measured the IS response of the fully water saturated model systems in the frequency range from 1 mHz to 1kHz. The influence of wettability was studied by modifying the originally hydrophilic silica beads surface into a hydrophobic state. The wettability change was verified by contact angle measurements. As results, we find pore size dependent relaxation times and salinity dependent chargeabilities for the hydrophilic samples, whereas for the hydrophobic samples chargeabilities are close to zero and independent of pore size and water salinity.
Responsible Party
Creator(s):Author: Jan Volkmann
Author: Norbert Klitzsch
Author: Oliver Mohnke
Author: Norbert Schleifer
Publisher:Society of Core Analysts
TR32 Topic:Other
Subject(s):CRC/TR32 Keywords: Impedance Spectrometer
File Details
File Name:Volkmann_et_al_2013.pdf
Data Type:Text
File Size:1024 kB (1 MB)
Date(s):Issued: 2013-09-16
Mime Type:application/pdf
Data Format:PDF
Download Permission:OnlyTR32
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
Licence:TR32DB Data policy agreement
North:-no map data
Measurement Region:Other
Measurement Location:--Other--
Specific Informations - Publication
Type:Event Paper
Number Of Pages:6
Page Range:419 - 424
Event Name:International Symposium of the Society of Core Analysts
Event Type:Conference
Event Location:Napa Valley, California, USA
Event Period:16th of September, 2013 - 19th of September, 2013
Event Url:http://www.scaweb.org/
Metadata Details
Metadata Creator:Ulrike Lussem
Metadata Created:2014-09-18
Metadata Last Updated:2014-09-18
Funding Phase:2
Metadata Language:English
Metadata Version:V40
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