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Pore and throat size distributions determined by mercury porosimetry and by direct observation


Pore and throat size distributions determined by mercury porosimetry and by direct observation



Carbonates and Evaporites 3(1): 1-16



ISSN/ISBN: 0891-2556

DOI: 10.1007/bf03174408

The sizes and size distributions of pores and throats and their arrangement relative to each other have been determined from mercury intrusion-extrusion capillary pressure curves of selected carbonate rock samples. Results obtained are compared with measurements made directly by observation of pore systems impregnated with fluorescent epoxy and viewed at high magnification with an optical microscope. Pore-size distributions obtained by porosimetry are partial distributions which exclude the larger pores in which mercury is trapped. Also, they indicate large volume fractions of smaller pores than are obtained by direct observation. The difference may be caused by partial withdrawal of mercury from the surface complexities of larger pores as capillary pressure is lowered. It is also caused by limitations of optical resolution for very small pores.

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Accession: 019748874

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