Surface Area Measurements on Sedimentary Rocks

Brooks, Clyde S.; Purcell, Walter

doi:10.2118/222-g

Cited by 19 publications

(15 citation statements)

References 2 publications

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“…Two of the core samples were crushed to grain size and their surface areas remeasured to determine if the nitrogen penetrated the entire sample. The data indicate that consolidation does not interfere with surface-area measurements, in agreement with the observations of Brooks and Purcell (1952). The Tensleep core sample seemed to have some organic material remaining in the core despite its extraction with toluene.…”

Section: I%esults and Discussionsupporting

confidence: 86%

“…The open end of the tubing then was sealed as close as possible to the core sample without charring. The measurement of surface areas of sedimentary rock samples has been discussed in detail by Brooks and Purcell (1952). The water-vapor adsorption study was performed with a gravimetrie apparatus similar to that of Keenan et al (L951), lV[ooney et al (1952aKeenan et al (L951), lV[ooney et al ( , 1952b and Wiig and Juhola (1949) and was designed to accommodate six samples simultaneously.…”

Section: Methodsmentioning

confidence: 99%

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Water-Vapor Adsorption on Clays

Johansen

1957

Clays clay miner. (Natl. Conf. Clays Clay Miner.)

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The distinctive response of clay minerals to water indicated that it should be possible to determine the water sensitivities of sedimentary rock samples directly by watervapor adsorption measm~ments. Therefore, the adsorption of water-vapor by standard clay samples and by core samples fl'om oil-producing formations has been investigated.Water-vapor adsorption isotherms of the montmorillonite and kaolinite samples are characteristic of the clay type and serve as an aid in their identification. The illite isotherm was intei~ncdiate between those of the other two types.Water-vapor adsorption by core samples from oil-producing formations varied with the contents of swelling clays and with water-sensitivities as indicated by previous x-ray analyses and permeability studies. Core samples containing montmorillonite clay adsorbed water vapor strongly and exhibited typical adsorption-desorption hysteresis. Correlations of nitrogen and water-vapor adsorption studies wi~h clay analyses and permeability measurements show ~hat the water-vapor adsorption method is a promising means for the direct measurement of the water sensitivities of sedimentary formations.

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Section: I%esults and Discussionsupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

Water-Vapor Adsorption on Clays

Johansen

1957

Clays clay miner. (Natl. Conf. Clays Clay Miner.)

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“…For the case of drainage capillary-rise values, the correlations of this type reported by different investigators6, 8,12,13 are in good agreement. Also, the observed values of the j-function correspond to a reasonable magnitude for the tortuosity.…”

Section: Limitations Of Previous Studiessupporting

confidence: 68%

Wettability as Related to Capillary Action in Porous Media

Melrose

1965

Society of Petroleum Engineers Journal

137

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The contact angle is one of the boundary conditions for the differential equation specifying the configuration of fluid-fluid interfaces. Hence, applying knowledge concerning the wettability of a solid surface to problems of fluid distribution in porous solids, it is important to consider the complexity of the geometrical shapes of the individual, interconnected pores.As an approach to this problem, the ideal soil model introduced by soil physicists is discussed in detail. This model predicts that the pore structure of typical porous solids will lead to hysteresis effects in capillary pressure, even if a zero value of the contact angle is maintained. The model is generalized to situations in which the contact angle takes on values between zero and 40 degrees. For the imbibition branch of the capillary -pressure function, the model predicts a considerable departure from the usually assumed cos e relationship. In fact, according to the model, it is possible that a displaced wetting phase will not be able to reimbibe, even when the contact angle does not exhibit hysteresis.

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“…This study compiles a database of permeability values extracted from published sources for carbonate rocks in the United States, Russia, the Middle East, and Europe (data sources are Brooks and Purcell, 1952;Chilingarian et al, 1990;Lucia, 1995;Mortensen et al, 1998;Lindsay et al, 2006;Fabricius et al, 2007;Clerke, 2009;Alam et al, 2011;Vincent et al, 2011). The 286 entries include mostly binary data in terms of permeability, rock formation, porosity, specific surface, and/or pore-size distribution (see Table S1, supplementary material available as AAPG Datashare 115 at www.aapg.org/ datashare).…”

Section: Database: Characterization and Potential Pitfallsmentioning

confidence: 99%

Carbonate rocks: Matrix permeability estimation

Cardona

Santamarina

2020

Bulletin

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Carbonate rocks store half of the world's proven oil reserves. Genesis and postdepositional diagenetic processes define the porous network topology and the matrix permeability. This study compiles a database of porosity, specific surface, mercury porosimetry, and permeability values extracted from published sources and complements the database through a focused experimental study. Specific surface and porosity combine to estimate the pore size (D sur). Permeability versus D sur data cluster along a single trend with a slope of 2 in a log-log scale, which is in agreement with the Kozeny-Carman model. Discordant data points correspond to samples with dual porosity or broad pore-size distributions with long tails, where flow channels along larger interconnected pores. Indeed, the detailed analysis of all the porosimetry data in the database shows that permeability correlates best with the pore size D80, that is, the 80th percentile in pore-size distributions. Once again, the best fit is a power function in terms of (D80) 2 , analogous to Kozeny-Carman. The prediction uncertainty using D80 is one order of magnitude and has the same degree of uncertainty as more complex models and analyses. This observation suggests an irreducible uncertainty of one order of magnitude in permeability estimation from index properties such as porosity, mercury porosimetry, and specific surface probably resulting from specimen preparation effects, inherent physical differences in permeation versus invasion, and difficulties in data interpretation. These estimates of permeability are most valuable when specimens are limited to small sizes, such as cuttings.

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Surface Area Measurements on Sedimentary Rocks

Cited by 19 publications

References 2 publications

Water-Vapor Adsorption on Clays

Water-Vapor Adsorption on Clays

Wettability as Related to Capillary Action in Porous Media

Carbonate rocks: Matrix permeability estimation

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