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Petroleum Geoscience; June 2001; v. 7; no. 2; p. 99-105
© 2001 Geological Society of London
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Articles

Investigation of the petrophysical properties of a porous sandstone sample using confocal scanning laser microscopy

N. Petford1, G. Davidson2 and J. A. Miller3

1 Centre for Earth and Environmental Science Research, Kingston University, Surrey KT1 2E, UK (email:n.pet{at}king.ac.uk)
2 Department of Electronic and Electrical Engineering, University College, Torrington Place, London WC1E 7J, UK
3 Bullard Laboratories, Department of Earth Sciences, University of Cambridge CB3 0EZ, UK

Confocal scanning laser microscopy (CSLM) is used to produce images of the two- and three-dimensional distribution and geometry of pore space in a reservoir sandstone and measure the 2D distribution of pore throat radii. Nondestructive serial sectioning of the rock using laser light at 100% illumination, combined with image thresholding and histogram equalization techniques allow the pore volume structure of the uppermost 100 µm of the sample to be reconstructed. Negative imaging of the pore volume gave superior depth and feature resolution compared to positive (reflection) imaging. Artefacts encountered in applying classical Medial Axial Transforms to CSLM images include branch networks dominated by coordination numbers of 3. Skeletonization using Euclidean distance maps gives increased accuracy in the description of the pore network. Measured pore throat size distribution in the rock is strongly exponential and described by the expression y=219e–0.25x where y is the number of pore throats.

KEYWORDS: confocal microscopy, lasers, pore volume, pore size, stereology, imaging






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