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On the Problems of Total Specific Surface Area and Cation Exchange Capacity Measurements in Organic-Rich Sedimentary Rocks

Published online by Cambridge University Press:  01 January 2024

Arkadiusz Derkowski  and
Thomas F. Bristow
Arkadiusz Derkowski*
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, INGPAN, Senacka 1, PL-31002, Krakow, Poland
Thomas F. Bristow
Affiliation:
NASA Ames Research Center, Moffett Field, CA 94035, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The increasing exploration and exploitation of hydrocarbon resources hosted by oil and gas shales demands the correct measurement of certain properties of sedimentary rocks rich in organic matter (OM). Two essential properties of OM-rich shales, the total specific surface area (TSSA) and cation exchange capacity (CEC), are primarily controlled by the rock’s clay mineral content (i.e. the type and quantity). This paper presents the limitations of two commonly used methods of measuring bulk-rock TSSA and CEC, ethylene glycol monoethyl ether (EGME) retention and visible light spectrometry of Co(III)-hexamine, in OM-rich rocks. The limitations were investigated using a suite of OM-rich shales and mudstones that vary in origin, age, clay mineral content, and thermal maturity.

Ethylene glycol monoethyl ether reacted strongly with and was retained by natural OM, producing excess TSSA if calculated using commonly applied adsorption coefficients. Although the intensity of the reaction seems to depend on thermal maturity, OM in all the samples analyzed reacted with EGME to an extent that made TSSA values unreliable; therefore, EGME is not recommended for TSSA measurements on samples containing >3% OM.

Some evidence indicated that drying at ⩾200°C may influence bulk-rock CEC values by altering OM in early mature rocks. In light of this evidence, drying at 110°C is recommended as a more suitable pretreatment for CEC measurements in OM-rich shales. When using visible light spectrometry for CEC determination, leachable sample components contributed to the absorbance of the measured wavelength (470 nm), decreasing the calculated bulk rock CEC value. A test of sample-derived excess absorbance with zero-absorbance solutions (i.e. NaCl) and the introduction of corrections to the CEC calculation are recommended.

Keywords

BitumenCECEGMEKerogenOrganic MatterShaleSpecific Surface Area
Type
Article
Information
Clays and Clay Minerals , Volume 60 , Issue 4 , August 2012 , pp. 348 - 362
Copyright
Copyright © Clay Minerals Society 2012

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