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Discussion papers | Copyright
https://doi.org/10.5194/se-2018-42
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 14 May 2018

Research article | 14 May 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Enhanced pore space analysis by use of μ-CT, MIP, NMR, and SIP

Zeyu Zhang1, Sabine Kruschwitz2,3, Andreas Weller4, and Matthias Halisch5 Zeyu Zhang et al.
  • 1Southwest Petroleum University, School of Geoscience and Technology, 610500 Chengdu, China
  • 2Federal Institute for Material Research and Testing (BAM), D-12205 Berlin, Germany
  • 3Technische Universität Berlin, Institute of Civil Engineering, D-13355 Berlin, Germany
  • 4Clausthal University of Technology, Institute of Geophysics, D-38678 Clausthal-Zellerfeld, Germany
  • 5Leibniz Institute for Applied Geophysics (LIAG), D-30655 Hannover, Germany

Abstract. We investigate the pore space of rock samples with respect to different petrophysical parameters using various methods, which provide data upon pore size distributions, including micro computed tomography (μ-CT), mercury intrusion porosimetry (MIP), nuclear magnetic resonance (NMR), and spectral induced polarization (SIP). The resulting cumulative distributions of pore volume as a function of pore size are compared. Considering that the methods differ with regard to their limits of resolution, a multiple length scale characterization of the pore space geometry is proposed, that is based on a combination of the results from all of these methods. The approach is demonstrated using samples of Bentheimer and Röttbacher sandstone. Additionally, we compare the potential of SIP to provide a pore size distribution with other commonly used methods (MIP, NMR). The limits of resolution of SIP depend on the usable frequency range (between 0.002Hz and 100Hz). The methods with similar resolution show a similar behavior of the cumulative pore volume distribution in the overlapping pore size range. We assume that μ-CT and NMR provide the pore body size while MIP and SIP characterize the pore throat size. Our study shows that a good agreement between the pore radii distributions can only be achieved if the curves are adjusted considering the resolution and pore volume in the relevant range of pore radii. The MIP curve with the widest range in resolution should be used as reference.

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Short summary
We investigate the pore space of rock samples with respect to different petrophysical parameters using various methods, which provide data upon pore size distributions. The resulting cumulative distributions of pore volume as a function of pore size are compared. Considering that the methods differ with regard to their limits of resolution, a multiple length scale characterization of the pore space geometry is proposed, that is based on a combination of the results from all of these methods.
We investigate the pore space of rock samples with respect to different petrophysical parameters...
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