The determination of pore-size distributions from sorption isotherms and mercury penetration in interconnected pores: The application of percolation theory

Wall, Geoffrey; Brown, R. J. C.

doi:10.1016/0021-9797(81)90132-6

Cited by 112 publications

(76 citation statements)

References 3 publications

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“…This transformation assumes that the porous medium is a bundle of nonintersecting tubes, which is clearly an unreasonable assumption for most sedimentary rocks. The transformation to pore sizes also is misleading because mercury intrusion is a percolation phenomenon, where the filling of a network of pores occurs as a sequential process (Lane et al, 1986;Wall and Brown, 1981). In order for an interior pore to be filled, it must be connected to the outer surface by a Pore 0.1 microns Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Porosimetry Measurement of Shale Fabric and Its Relationship to Illite/Smectite Diagenesis

Howard

1991

Clays and clay miner.

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Abstract--The extent of illite/smectite (I/S) reactions is linked with quantitative measurements of shale fabric in a suite of samples from a lower Frio Formation well. Greater illitization of the I/S clays is found in laminated shales that possess a larger pore surface area/pore volume (SA/V) of 3.21 x 106 cm-~ than the adjacent massive shale lithofacies with a SA/V of 1.97 x 106 cm -~. Mean pore diameter in both shale lithologies is 0.0145 micrometers, though in the laminated shale distributions are skewed towards more smaller-sized pores. While no direct permeability measurements were made, estimates of permeability that are based on simple physical models using SA/V suggest that lower permeabilities are associated with laminated shales. The trend of greater illitization at higher SA/V values is contrary to expectations that reaction extent is enhanced by greater permeabilities, such as created by silt laminations in shale. The limitations of estimated permeabilities emphasize that porosimetry measurements of shale fabric are useful for estimating the access of material to all reaction sites, and do not just describe the effect of a few large pores that dominate permeability. Greater reaction extent in the laminated shales is associated with the accessibility of fluids to more pore space than in the massive shales.

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Section: Methodsmentioning

confidence: 99%

Porosimetry Measurement of Shale Fabric and Its Relationship to Illite/Smectite Diagenesis

Howard

1991

Clays and clay miner.

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“…Similar isotherms can result from more than one arrangement of empty space within the solid, and deduction of the nature of porosity of a sample from the observed isotherm depends upon assumptions about the nature of the porosity and the distribution of the adsorbed fluid within the pores. Therefore, isotherms themselves are usually not enough information upon which to base firm conclusions, particularly in cases where percolation effects in a system of interconnected pores influence the desorption process [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Neutron scattering study of adsorption in porous MCM-41 silicaSpecial issue on Neutron Scattering in Canada.

2010

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Adsorption of n-pentane on MCM-41 silica has been studied by neutron scattering on both the adsorption and desorption isotherms. Adsorption takes place without hysteresis in either the isotherm or the neutron scattering profile. Adsorption of contrast-matched pentane in porous MCM-41 silica at first increases the intensity of the (10) Bragg peak but reduces the (11) and (20) peaks, and as the pores are filled the intensities of all Bragg peaks are reduced to zero. The SANS background has a 1/Q dependence, typical of a material prepared with templates of one-dimensional character (cylinders). The initial increase of (10) intensity allows estimation of the cylindrical pore diameter to be 37 Å based on the variation of form factor as a function of the cylinder radius. Résumé : Nous avons étudié l'adsorption du n-pentane sur de la silice MCM-41 par diffusion de neutrons sur les deux isothermes d'adsorption et de désorption. L'adsorption se produit sans hystérèse soit dans l'isotherme ou le profil de diffusion de neutrons. Au début, l'adsorption en appariement de contraste du n-pentane dans la silice MCM-41 augmente l'intensité du pic (10) de Bragg, mais réduit celle des pics (11) et (20). À mesure que les pores se remplissent, l'intensité de tous les pics de Bragg diminue à zéro. Le bruit de fond de la diffusion de neutrons à petits angles (SANS) a une dépendance en 1/ Q typique d'un matériau préparé avec des gabarits de type unidimensionnels (cylindres). L'augmentation initiale de l'intensité du pic (10) permet d'estimer que le diamètre des pores cylindriques est 37 Å en se basant sur la variation du facteur de forme en fonction du rayon du cylindre.[Traduit par la Rédaction]

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“…It is recalled that, in the absence or nucleation, primary desorption is an ordinary percolation process [71,72,76,80,109,123], while secondary desorption requires the solution to a growth problem from a fixed number of sources as discussed in [80]. In the presence of nucleation, the desorption process (primary or secondary) is neither of the above.…”

Section: {17)mentioning

confidence: 99%

“…By contrast, in the cylindrical geometry bonds, 8 changes from 1 for desorption to 1/2 for adsorption. This difference reflects local hysteresis for elements of cylindrical geometry, and it is tacitly assumed negligible [70,71,72,76,109,123]. In the case of a single pore (infinite· connectivity), the above define the relative pressure for phase change in the element of size r. One may then parameterize the proeess (adsorption, desorption) by a variable radius, denoted hereafter for consistency [56,57,80,79] byrd, and obtained from (1) and (2) by taking 8 = 1.…”

Section: Effects Of Nucleationmentioning

confidence: 99%

“…Network models incorporating percolation concepts have emerged as useful alternatives and have been successfully used to predict several characteristics of primary [71,76,109] and secondary [70, 72] sorption processes. A comprehensive approach outlining the relevance of percolation theory in the description of primary and secondary sorption processes was developed in [80].…”

Section: Introductionmentioning

confidence: 99%

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Modification of chemical and physical factors in steamflood to increase heavy oil recovery

Yortsos¹

1990

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The determination of pore-size distributions from sorption isotherms and mercury penetration in interconnected pores: The application of percolation theory

Cited by 112 publications

References 3 publications

Porosimetry Measurement of Shale Fabric and Its Relationship to Illite/Smectite Diagenesis

Porosimetry Measurement of Shale Fabric and Its Relationship to Illite/Smectite Diagenesis

Neutron scattering study of adsorption in porous MCM-41 silicaSpecial issue on Neutron Scattering in Canada.

Modification of chemical and physical factors in steamflood to increase heavy oil recovery

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