Multiscale description of shale pore systems by scanning SAXS and WAXS microscopy

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Title: Multiscale description of shale pore systems by scanning SAXS and WAXS microscopy
Authors: Leu, L
Georgiadis, A
Blunt, MJ
Busch, A
Bertier, P
Schweinar, K
Liebi, M
Menzel, A
Ott, H
Item Type: Journal Article
Abstract: The pore space of shales and mudrocks ranges from molecular dimensions to micrometers in length scale. This leads to great variation in spatial characteristics across many orders of magnitude, which poses a challenge for the determination of a representative microscopic pore network for such systems. Standard characterization techniques generally provide volume-averaged properties while high-resolution imaging techniques do not assess a representative range of pore sizes because of limitations in the spatial resolution over the field of view. Due to this complexity, open questions remain regarding the role of the pore network in retention and transport processes, which in turn control oil and gas production. Volume-averaged but spatially resolved information is obtained for pores of size from 2 to 150 nm by applying scanning small- and wide-angle X-ray scattering (SAXS and WAXS) microscopy. Scattering patterns are collected in a scanning microscopy mode, such that microvoxels are sampled sequentially, over a total of 2 × 2 mm2 raster area on specifically prepared thin sections with a thickness of 10–30 μm. Spatially resolved variations of porosity, pore-size distribution, orientation, as well as mineralogy are derived simultaneously. Aiming at a full characterization of the shale pore network, the measurements and subsequent matrix porosity analysis are integrated in a multiscale imaging workflow involving FIB-SEM, SEM, and μ-CT analysis.
Issue Date: 2-Nov-2016
Date of Acceptance: 1-Nov-2016
URI: http://hdl.handle.net/10044/1/44087
DOI: http://dx.doi.org/10.1021/acs.energyfuels.6b02256
ISSN: 1520-5029
Publisher: American Chemical Society
Start Page: 10282
End Page: 10297
Journal / Book Title: Energy & Fuels
Volume: 30
Issue: 12
Copyright Statement: © 2016 American Chemical Society. This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html), which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
Sponsor/Funder: Shell Global Solutions International BV
Funder's Grant Number: PO no. 4550134619
Keywords: Science & Technology
Technology
Energy & Fuels
Engineering, Chemical
Engineering
SMALL-ANGLE-SCATTERING
X-RAY-SCATTERING
CLAY MONT TERRI
OPALINUS CLAY
BIB-SEM
NEUTRON-SCATTERING
SPACE MORPHOLOGY
POSIDONIA SHALE
GAS-ADSORPTION
SURFACE-AREA
Energy
03 Chemical Sciences
09 Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Earth Science and Engineering



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