Gutenberg Open


Personen: Jacob, Arne (Autor) 
Enzmann, Frieder (Autor) 
Hinz, Christian (Autor) 
Kersten, Michael (Autor) 
Titel: Analysis of variance of porosity and heterogeneity of permeability at the pore scale
Quelle: Transport in porous media. Bd. 130. H. 3. Dordrecht u.a. : Springer Science + Business Media B.V. S. 867 - 887
Erscheinungsjahr:    2019
ISBN / ISSN: 1573-1634 ; 0169-3913
URL der Originalveröffentlichung doi:10.1007/s11242-019-01342-7
Zeitschriftenaufsatz Zeitschriftenaufsatz
Sprache: Englisch
Open Access:
Personen der Universität:    Jacob, Arne  In UnivIS suchen  ; Enzmann, Frieder  In UnivIS suchen ; Kersten, Michael  In UnivIS suchen 
Einrichtung: Institut für Geowissenschaften
DDC-Sachgruppe:    Geowissenschaften
DFG-Fachgebiet: Wasserforschung
ID: 59418  Universitätsbibliothek Mainz
Informationen zu den Nutzungsrechten unserer Inhalte Informationen zu den Nutzungsrechten unserer Inhalte
Abstract: We present a new statistical variance approach for characterizing heterogeneities related to pore spaces in reservoir rocks. Laboratory-based computer microtomography data for Reservoir sandstone samples were acquired and processed using advanced image Segmentation techniques. The samples were processed using a method based on the digital rock Physics concept using the high-performance Navier–Stokes flow solver in the GeoDict Commercial software package. The digitized structures were subjected to computational fluid dynamic
simulations. The effects of structural matrix modifications caused by the precipitation of minerals on the porosity–permeability relationship and the characterization of the representative elementary volume were assessed. The variances of the digital flow fields were compared at the pore scale (6 μm). The algorithm for analysing variance was benchmarked using a synthetic dataset that provided artificial repetitive structural patterns at both low and high resolutions. This gave an estimate of the sensitivity of the proposed algorithm to minor inhomogeneities. Representative elementary volume variance analysis was performed by comparing the correlation coefficients for various pore–grain composition patterns with the variances of simulated mean flow velocities. Probability density functions indicate that the flow velocities and pore space geometries differed greatly for different samples. The normalized probability density functions of the mean flows shifted to higher velocities as the resolution decreased. We found that a representative elementary volume analysis was more reliably achieved by analysing the mean flow velocity variance than by analysing the pore microstructure alone.
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