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@INPROCEEDINGS{Rezaeyan:868317,
author = {Rezaeyan, Amirsaman and Seemann, Timo and Bertier, Pieter
and Pipich, Vitaliy and Leu, Leon and Kampman, Niko and
Feoktystov, Artem and Barnsley, Lester and Busch, Andreas},
title = {{U}nderstanding {P}ore {S}tructure of {M}udrocks and
{P}ore-{S}ize {D}ependent {S}orption {M}echanism {U}sing
{S}mall {A}ngle {N}eutron {S}cattering},
reportid = {FZJ-2019-06867},
pages = {1-13},
year = {2019},
comment = {Proceedings of the SPE/AAPG/SEG Asia Pacific Unconventional
Resources Technology Conference - Unconventional Resources
Technology Conference Tulsa, OK, USA, 2019. - ISBN
978-1-61399-673-7 - doi:10.15530/AP-URTEC-2019-198285},
booktitle = {Proceedings of the SPE/AAPG/SEG Asia
Pacific Unconventional Resources
Technology Conference - Unconventional
Resources Technology Conference Tulsa,
OK, USA, 2019. - ISBN 978-1-61399-673-7
- doi:10.15530/AP-URTEC-2019-198285},
abstract = {To quantitatively analyse the pore structure at a broad
pore scale range (~ 2 nm to ~ 2 μm), low pressure sorption
(LPS) and small angle neutron scattering (SANS) were
conducted on several mudrocks originating from radioactive
waste storage sites, hydrocarbon seals and shale gas
reservoirs across the globe. These include Opalinus Clay,
Switzerland, Posidonia Shale, Germany, and Carmel Claystone,
Bossier Shale, and Eagle Ford Shale, USA. Furthermore, upon
injection of supercritical fluids (deuterated methane, CD 4)
into the pore space of mudrocks, the phase behaviour
depending on pore size was investigated with subsequent
neutron scattering. The results have revealed a vast
heterogeneity, 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 up to 80 $\%$ of specific surface area (SSA).
Moreover, total porosity and SSA are not significantly
affected by thermal maturation. However, thermal maturity
contributes to different pore size distribution (PSD)
related to meso-and macro-pores. Thermal maturation is
likely to develop porosity at macroscale range, which can
enhance the permeability for continuum flow in organic rich
mudrocks. Results obtained from supercritical fluid sorption
within SANS experiments demonstrated the formation of an
adsorbed phase characterised by a higher density than
predicted for the bulk fluid by the equation of state. The
effect of sorbed phase is pore size dependent. It implies
that the density as well as the volume fraction of the
adsorbed phase are influenced by the pore structure; sorbed
phase tends to fill small pores, followed by progressively
filling larger pores. Mineralogy and maturity interplays
contribute to a pore network of few-to-several nano-Darcy
permeability in which pore size dependent transport
mechanisms can vary from diffusional transport in small
pores to slip flow in progressively larger pores. In order
to improve pore 2 URTEC-198285-MS network models, the
incorporation of SANS PSD as well as pore size dependent
sorption are important to more realistically understand
storage capacity and/or transport phenomena in mudrocks.},
month = {Nov},
date = {2019-11-18},
organization = {SPE/AAPG/SEG Asia Pacific
Unconventional Resources Technology
Conference, Brisbane (Australia), 18
Nov 2019 - 19 Nov 2019},
cin = {JCNS-1 / JCNS-FRM-II / MLZ},
cid = {I:(DE-Juel1)JCNS-1-20110106 /
I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3},
pnm = {6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
/ 6G15 - FRM II / MLZ (POF3-6G15)},
pid = {G:(DE-HGF)POF3-6G4 / G:(DE-HGF)POF3-6G15},
experiment = {EXP:(DE-MLZ)KWS1-20140101 / EXP:(DE-MLZ)KWS3-20140101},
typ = {PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
doi = {10.15530/AP-URTEC-2019-198285},
url = {https://juser.fz-juelich.de/record/868317},
}