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Compositional Data Analysis as a tool for interpretation of rock porosity parameters

Labus M.

Geological Quarterly

2005

Vol. 49, No. 3

347-354

This work examines the possibility of implementing the statistical method, Compositional Data Analysis (CDA), to rock porosity measurement data. The rock samples analysed are different types of sandstones from Poland. Porosimetricmeasurements were carried out using the mercury injection capillary pressure method, together with computer image analysis. In this paper, compositions of data concerning pore distributions are analysed. Rock pores were distributed in 4 classes of pore dimensions: transitive pores, submacropores, realmacropores and over-capillary pores. Based on the CDAmethods it was revealed that: there is no constant proportion between transitive andmacropores in the sandstones analyzed; the variability of the realmacropores, over-capillary and transitive pores and the skeletal grains fraction is mainly one-dimensional. The relative variation between transitive pores and real macropores determines the variability in the sandstone stratigraphical groups; however, these groups are not very distinct as regards the pore sizes and skeletal grains proportion. The rock parameters: median pore diameter; threshold pore diameter and total pore area might be used as independent variables in equations that explain reasonable parts of variability of pore sizes and skeletal grains fraction log-ratios.

Studies on the inner structure of porous sodium-borate-silicate glass and some clusters formed therein

Novikov A.F.

Optica Applicata

2000

Vol. 30, nr 4

569-575

The nanoporous sodium-borate-silicate glasses Na 7/23 (standard symbol) with pore sizes within 5-100 nm have been investigated. The X-ray investigations in wide and small angles allowed us to determine some important parameters of glassy framework: the percentage distribution of pore sizes being in the vicinity of 8 nm and 80 nm; fractal dimensionality of porous glass being of 20 (8 nm pores) and 1.81 (80 nm); crystallinity grade within the vitreous bulk being of 7% (8 nm) and 9% (80 nm) phase composition of crystalline areas within the silica framework. The nanoclusters of crystallohydrates on the basis of cobalt(II) chloride supported on the inner surface of nanopores have been characterised