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A non-volumetric method of measuring the ratio of solid and voids in porous material with a computer aided system
Méthode de mesure non volumétrique du rapport solide/vides dans un matériau poreux à l'aide d'un logiciel d'analyse d'images
Журнал Bulletin of Engineering Geology and the Environment
Springer Berlin / Heidelberg
ISSN 1435-9529 (Print) 1435-9537 (Online)
Volume 53, Number 1 / Апрель 1996 г.
DOI 10.1007/BF02594944
Страницы 83-95
Subject Collection Наука о Земле и окружающей среде
Дата SpringerLink 9 апреля 2007 г.

A non-volumetric method of measuring the ratio of solid and voids in porous material with a computer aided system
Passas N. 1, Butenuth C. 1 and Freitas M. H. de 1

(1) Imperial College of Science, Technology and Medicine, Dept. of Geology, Engineering Geology Group, SW7 2BP London, UK


Abstract A computer-aided method used to determine the porosity of Penrith sandstone is presented. Penrith sandstone is a coarse well sorted orthoquarzite with a high degree of mineralogical and textural maturity (Waugh, 1970). A computer-aided system has been developed which analyses photographic images of petrological thin sections. The visible voids are identified on the photos, traced onto paper, and scanned into IDRISI 4.1, a Geographic Information System. The images reproduced by the computer are of two colours, black and white, black representing the solids and white the voids, and the area occupied by each measured using IDRISI. Porosity was considered to be the ratio, or the percentage, of the area which represented the voids to the area of the whole image. The results obtained are compared with results from standard methods of measuring the true porosity of rock.
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