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Book Chapter

Determining the porosity of mudrocks using methodological pluralism

By
Andreas Busch
Andreas Busch
Shell Global Solutions International, Kessler Park 1, 2288GS Rijswijk, The NetherlandsHeriot-Watt University, Lyell Centre, Research Avenue S, Edinburgh EH14 4AS, UK
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Kevin Schweinar
Kevin Schweinar
Shell Global Solutions International, Kessler Park 1, 2288GS Rijswijk, The NetherlandsClay and Interface Mineralogy, RWTH Aachen University, Bunsenstrasse 8, 52072 Aachen, Germany
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Niko Kampman
Niko Kampman
Shell Global Solutions International, Kessler Park 1, 2288GS Rijswijk, The Netherlands
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Ab Coorn
Ab Coorn
Shell Global Solutions International, Kessler Park 1, 2288GS Rijswijk, The Netherlands
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Vitaliy Pipich
Vitaliy Pipich
Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstrasse 1, 85748 Garching, Germany
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Artem Feoktystov
Artem Feoktystov
Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Lichtenbergstrasse 1, 85748 Garching, Germany
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Leon Leu
Leon Leu
Shell Global Solutions International, Kessler Park 1, 2288GS Rijswijk, The NetherlandsDepartment of Earth Science and Engineering, Imperial College London, London SW7 2AZ, UK
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Alexandra Amann-Hildenbrand
Alexandra Amann-Hildenbrand
Institute of Geology and Geochemistry of Petroleum and Coal, Energy and Mineral Resources Group (EMR), RWTH Aachen University, Lochnerstrasse 4-20, D-52056 Aachen, Germany
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Pieter Bertier
Pieter Bertier
Clay and Interface Mineralogy, RWTH Aachen University, Bunsenstrasse 8, 52072 Aachen, Germany
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Published:
January 01, 2017

Abstract

Porosity of shales is an important parameter that impacts rock strength for seal or wellbore integrity, gas-in-place calculations for unconventional resources or the diffusional solute and gas transport in these microporous materials. From a well section obtained from the Mont Terri Underground Rock Laboratory in St Ursanne, Switzerland, we determined porosity, pore size distribution and specific surface areas on a set of 13 Opalinus Clay samples. The porosity methods employed are helium-pycnometry, water and mercury injection porosimetry, liquid saturation and immersion, and low pressure N2 sorption, as well as small-angle to ultra-small-angle neutron scattering (SANS–USANS). These were used in addition to mineralogical and geochemical methods for sample analysis that comprise X-ray diffraction, X-ray fluorescence, total organic carbon content and cation exchange capacity. We find large variations in total porosity, ranging from approximately 23% for the neutron-scattering method to approximately 10% for mercury injection porosimetry. These differences can partly be related to differences in pore accessibility, while no or negligible inaccessible porosity was found. Pore volume distributions between neutron scattering and low-pressure sorption compare very well but differ significantly from those obtained from mercury porosimetry: this is realistic since the latter provides information on pore throats only, and the two former methods on pore throats and pore bodies. Finally, we find that specific surface areas determined using low-pressure sorption and neutron scattering match well.

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Contents

Geological Society, London, Special Publications

Geomechanical and Petrophysical Properties of Mudrocks

E. H. Rutter
E. H. Rutter
University of Manchester, UK
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J. Mecklenburgh
J. Mecklenburgh
University of Manchester, UK
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K. Taylor
K. Taylor
University of Manchester, UK
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Geological Society of London
Volume
454
ISBN electronic:
978-1-78620-335-9
Publication date:
January 01, 2017

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