Microstructural Investigation of Mudrock Seals Using Nanometer-Scale Resolution Techniques

Research output: Contribution to report/book/conference proceedingsIn-proceedings paper

Authors

  • Timo Seemann
  • Amirsaman Rezaeyan
  • Vitaliy Pipich
  • Pieter Bertier
  • Leon Leu
  • Niko Kampman
  • Artem feoktystov
  • Lester Barnsley
  • Andreas Busch

Institutes & Expert groups

  • HW - Heriot-Watt University - School of Engineering and Physical Sciences
  • Imperial College London
  • FZJ - Forschungszentrum Jülich GmbH
  • RWTH - Aachen University
  • Shell Global Solutions International B.V

Abstract

Small angle neutron scattering (SANS) and nitrogen low-pressure adsorption (LPS) have been used to characterise the pore structure of two organic lean mudrocks, Opalinus Clay, Mont Terri, Switzerland and Carmel Claystone, Utah. This was done in order to obtain a better understanding of H2 and CO2 transport, reaction and sorption related to radioactive waste disposal and carbon storage, respectively. The pore structure information derived by SANS and LPS are comparable and the results have revealed a vast heterogeneity from 2 nm to 2 μm, which can be related to the high clay contents. Due to the high clay contents, pores smaller than 10 nm constitute a large fraction of total porosity (25-30 %) and most of specific surface area (up to 80 %) in the sample mudrocks. Accordingly, these interplays contribute to a pore network of few-to-several nano-Darcy permeability in which pore size dependent transport mechanisms can vary from high sorptive diffusional fluid flow in small pores to low sorptive slip flow regime at progressively larger pores.

Details

Original languageEnglish
Title of host publicationConference Proceedings, Sixth EAGE Shale Workshop
PublisherEAGE Publications BV
Pages1-5
Number of pages5
Volume42
Edition2019
DOIs
Publication statusPublished - May 2019
Event6th EAGE Shale Workshop 2019 - Bordeaux, France
Duration: 28 Apr 20191 May 2019
https://www.eage.org/sitecore/content/events/home/2019/sixth-eage-shale-workshop?sc_lang=en

Workshop

Workshop6th EAGE Shale Workshop 2019
CountryFrance
CityBordeaux
Period2019-04-282019-05-01
Internet address

Keywords

  • Neutron scattering, Pore size, Pore structure, Radioactive waste transportation, Shale, Transport properties, Waste disposal

ID: 6736489