Rock properties influencing impedance spectra studied by lab measurements on porous model systems

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Title:Main Title: Rock properties influencing impedance spectra studied by lab measurements on porous model systems
Description: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
Creators:Jan Volkmann (Author), Norbert Klitzsch (Author), Oliver Mohnke (Author), Norbert Schleifer (Author)
Publisher:Society of Core Analysts
Publication Year:2014
Topic
TR32 Topic:Other
Related Subproject:A2
Subject:Keyword: Impedance Spectrometer
File Details
Filename:Volkmann_et_al_2013.pdf
Data Type:Text - Event Paper
File Size:1 MB
Date:Issued: 16.09.2013
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
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
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Specific Information - Publication
Publication Status:Published
Review Status:Not peer reviewed
Publication Type:Event Paper
Number of Pages:6 (419 - 424)
Event:International Symposium of the Society of Core Analysts
Event Type:Conference
Event Location:Napa Valley, California, USA
Event Duration:16th of September, 2013 - 19th of September, 2013
Event Website:http://www.scaweb.org/
Metadata Details
Metadata Creator:Ulrike Lussem
Metadata Created:18.09.2014
Metadata Last Updated:18.09.2014
Subproject:A2
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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