Porosity and permeability determination of organic-rich Posidonia shales based on 3-D analyses by FIB-SEM microscopy

Publikationstyp:
Zeitschriftenaufsatz
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Autoren
Autoren-URL
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000381217200012&DestLinkType=FullRecord&DestApp=WOS_CPL
DOI
10.5194/se-7-1145-2016
eISSN
1869-9529
Externe Identifier
  • Clarivate Analytics Document Solution ID: DT1BR
ISSN
1869-9510
Ausgabe der Veröffentlichung
4
Zeitschrift
SOLID EARTH
Paginierung
1145 - 1156
Datum der Veröffentlichung
2016
Status
Published
Titel
Porosity and permeability determination of organic-rich Posidonia shales based on 3-D analyses by FIB-SEM microscopy
Sub types
  • Article
Ausgabe der Zeitschrift
7

Datenquelle: Web of Science (Lite)

Andere Metadatenquellen:
Abstract
<jats:p>Abstract. The goal of this study is to better understand the porosity and permeability in shales to improve modelling fluid and gas flow related to shale diagenesis. Two samples (WIC and HAD) were investigated, both mid-Jurassic organic-rich Posidonia shales from Hils area, central Germany of different maturity (WIC R0 0.53 % and HAD R0 1.45 %). The method for image collection was focused ion beam (FIB) microscopy coupled with scanning electron microscopy (SEM). For image and data analysis Avizo and GeoDict was used. Porosity was calculated from segmented 3-D FIB based images and permeability was simulated by a Navier Stokes–Brinkman solver in the segmented images. Results show that the quantity and distribution of pore clusters and pores (≥  40 nm) are similar. The largest pores are located within carbonates and clay minerals, whereas the smallest pores are within the matured organic matter. Orientation of the pores calculated as pore paths showed minor directional differences between the samples. Both samples have no continuous connectivity of pore clusters along the axes in the x, y, and z direction on the scale of 10 to 20 of micrometer, but do show connectivity on the micrometer scale. The volume of organic matter in the studied volume is representative of the total organic carbon (TOC) in the samples. Organic matter does show axis connectivity in the x, y, and z directions. With increasing maturity the porosity in organic matter increases from close to 0 to more than 5 %. These pores are small and in the large organic particles have little connection to the mineral matrix. Continuous pore size distributions are compared with mercury intrusion porosimetry (MIP) data. Differences between both methods are caused by resolution limits of the FIB-SEM and by the development of small pores during the maturation of the organic matter. Calculations show no permeability when only considering visible pores due to the lack of axis connectivity. Adding the organic matter with a background permeability of 1 × 10−21 m2 to the calculations, the total permeability increased by up to 1 order of magnitude for the low mature and decreases slightly for the overmature sample from the gas window. Anisotropy of permeability was observed. Permeability coefficients increase by 1 order of magnitude if simulations are performed parallel to the bedding. Our results compare well with experimental data from the literature suggesting that upscaling may be possible in the future as soon as maturity dependent organic matter permeability coefficients can be determined. </jats:p>
Autoren
DOI
10.5194/se-7-1145-2016
eISSN
1869-9529
Ausgabe der Veröffentlichung
4
Zeitschrift
Solid Earth
Sprache
en
Online publication date
2016
Paginierung
1145 - 1156
Status
Published online
Herausgeber
Copernicus GmbH
Herausgeber URL
http://dx.doi.org/10.5194/se-7-1145-2016
Datum der Datenerfassung
2021
Titel
Porosity and permeability determination of organic-rich Posidonia shales based on 3-D analyses by FIB-SEM microscopy
Ausgabe der Zeitschrift
7

Datenquelle: Crossref

Author's licence
CC-BY
Autoren
Hosting institution
Universitätsbibliothek Mainz
Sammlungen
  • JGU-Publikationen
Resource version
Published version
URN
urn:nbn:de:hebis:77-publ-545050
DOI
10.5194/se-7-1145-2016
File(s) embargoed
false
Open access
true
ISSN
1869-9529
Ausgabe der Veröffentlichung
4
Zeitschrift
Solid earth
Schlüsselwörter
  • 550 Geowissenschaften
  • 550 Earth sciences
Sprache
eng
Open access status
Open Access
Paginierung
1145 - 1156
Datum der Veröffentlichung
2016
Public URL
https://openscience.ub.uni-mainz.de/handle/20.500.12030/686
Herausgeber
Copernicus Publ.
Herausgeber URL
http://dx.doi.org/10.5194/se-7-1145-2016
Datum der Datenerfassung
2016
Datum, an dem der Datensatz öffentlich gemacht wurde
2016
Zugang
Public
Titel
Porosity and permeability determination of organic-rich Posidonia shales based on 3-D analyses by FIB-SEM microscopy
Ausgabe der Zeitschrift
7

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