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

N. Petford*, G. Davidson, J. A. Miller

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)

    Abstract

    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. Non-destructive 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 -0.25N where y is the number of pore throats.

    Original languageEnglish
    Pages (from-to)99-105
    Number of pages7
    JournalPetroleum Geoscience
    Volume7
    Issue number2
    Publication statusPublished - 2001

    Keywords

    • Confocal microscopy
    • Imaging
    • Lasers
    • Pore size
    • Pore volume
    • Stereology

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