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Angstrom-to-millimeter characterization of sedimentary rock microstructure

Identifieur interne : 00AD84 ( Main/Exploration ); précédent : 00AD83; suivant : 00AD85

Angstrom-to-millimeter characterization of sedimentary rock microstructure

Auteurs : A. P. Radlinski [Australie] ; M. A. Ioannidis [Canada] ; A. L. Hinde [Australie] ; A. M. Hainbuchner [Autriche] ; M. Baron [France] ; H. Rauch [Autriche] ; S. R. Kline [Autriche, États-Unis]

Source :

RBID : Pascal:04-0339635

Descripteurs français

English descriptors

Abstract

Backscatter SEM imaging and small-angle neutron scattering (SANS data are combined within a statistical framework to quantify the microstructure of a porous solid in terms of a continuous pore-size distribution spanning over five orders of magnitude of length scale, from 10 Å to 500 μm. The method is demonstrated on a sample of natural sandstone and the results are tested against mercury porosimetry (MP) and nuclear magnetic resonance (NMR) relaxation data. The rock microstructure is fractal (D = 2.47) in the pore-size range 10 Å-50 μm and Euclidean for larger length scales. The pore-size distribution is consistent with that determined by MP. The NMR data show a bimodal distribution of proton T2 relaxation times, which is interpreted quantitatively using a model of relaxation in fractal pores. Pore-length scales derived from the NMR data are consistent with the geometrical parameters derived from both the SEM/SANS and MP data. The combined SANS/BSEM method furnishes new microstructural information that should facilitate the study of capillary phenomena in hydrocarbon reservoir rocks and other porous solids exhibiting broad pore-size distributions.


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Le document en format XML

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<div type="abstract" xml:lang="en">Backscatter SEM imaging and small-angle neutron scattering (SANS data are combined within a statistical framework to quantify the microstructure of a porous solid in terms of a continuous pore-size distribution spanning over five orders of magnitude of length scale, from 10 Å to 500 μm. The method is demonstrated on a sample of natural sandstone and the results are tested against mercury porosimetry (MP) and nuclear magnetic resonance (NMR) relaxation data. The rock microstructure is fractal (D = 2.47) in the pore-size range 10 Å-50 μm and Euclidean for larger length scales. The pore-size distribution is consistent with that determined by MP. The NMR data show a bimodal distribution of proton T
<sub>2</sub>
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