Details

Autor(en) / Beteiligte

• Radlinski, A.P.
• Ioannidis, M.A.
• Hinde, A.L.
• Hainbuchner, M.
• Baron, M.
• Rauch, H.
• Kline, S.R.

Titel

Angstrom-to-millimeter characterization of sedimentary rock microstructure

Ist Teil von

• Journal of colloid and interface science, 2004-06, Vol.274 (2), p.607-612

Ort / Verlag

San Diego, CA: Elsevier Inc

Erscheinungsjahr

2004

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 2 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.