Authors:	Henkel, Steven Pudlo, Dieter Enzmann, Frieder Reitenbach, Viktor Albrecht, Daniel Ganzer, Leonhard Gaupp, Reinhard
Title:	X-ray CT analyses, models and numerical simulations : a comparison with petrophysical analyses in an experimental CO2 study
Online publication date:	2-Aug-2016
Year of first publication:	2016
Language:	english
Abstract:	An essential part of the collaborative research project H2STORE (hydrogen to store), which is funded by the German government, was a comparison of various analytical methods for characterizing reservoir sandstones from different stratigraphic units. In this context, Permian, Triassic, and Tertiary reservoir sandstones were analysed. Rock core materials, provided by RWE Gasspeicher GmbH (Dortmund, Germany), GDF Suez E&P Deutschland GmbH (Lingen,Germany), E.ON Gas Storage GmbH (Essen,Germany) and RAG Rohöl-Aufsuchungs Aktiengesellschaft (Vienna, Austria), were processed by different laboratory techniques; thin sections were prepared, rock fragments were crushed and cubes of 1 cm edge length and plugs 3 to 5 cm in length with a Diameter of about 2.5 cm were sawn from macroscopic homogeneous cores. With this prepared sample material, polarized light microscopy and scanning electron microscopy coupled with image analyses, specific surface area measurements (after Brunauer, Emmet and Teller, 1938; BET), He-porosity and N2-permeability measurements and high resolution microcomputer tomography (µ-CT), which were used for numerical simulations, were applied. All These methods were practised on most of the same sample material, before and on selected Permian sandstones also after static CO2 experiments under reservoir conditions. A major concern in comparing the results of these methods is an appraisal of the reliability of the given porosity, permeability and mineral-specific reactive (inner) surface area data. The CO2 experiments modified the petrophysical as well as the mineralogical/geochemical rock properties. These changes are detectable by all applied analytical methods. Nevertheless, a major outcome of the high-resolution µ-CT analyses and following numerical data simulations was that quite similar data sets and data interpretations were maintained by the different petrophysical standard methods. Moreover, the µ-CT analyses are not only time saving, but also nondestructive. This is an important point if only minor sample material is available and a detailed comparison before and after the experimental tests on micrometre pore scale of specific rock features is envisaged.
DDC:	550 Geowissenschaften 550 Earth sciences
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 09 Chemie, Pharmazie u. Geowissensch.
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-686
URN:	urn:nbn:de:hebis:77-publ-545073
Version:	Published version
Publication type:	Zeitschriftenaufsatz
License:	CC BY
Information on rights of use:	https://creativecommons.org/licenses/by/3.0/
Journal:	Solid Earth 7 3
Pages or article number:	917 927
Publisher:	Copernicus Publ.
Publisher place:	Göttingen
Issue date:	2016
ISSN:	1869-9529 1869-9510
Publisher URL:	http://dx.doi.org/10.5194/se-7-917-2016
Publisher DOI:	10.5194/se-7-917-2016
Appears in collections:	JGU-Publikationen