ISSN: 1945-7545
CODEN: GTJODJ
Page Count: 6

Rock Porosity Determinations Using Particle Densities Measured in Different Fluids

Passas, N
Imperial College of Science, Technology and Medicine, Centre for Geological Engineering, London,

Butenuth, C
Imperial College of Science, Technology and Medicine, Centre for Geological Engineering, London,

de Freitas, MH
Imperial College of Science, Technology and Medicine, Centre for Geological Engineering, London,

Bunatova, V
Charles University, Praha,

Abstract

Rock porosity, when calculated from measurements of bulk and particle rock density, is found to depend on the method used to determine these densities. The particle density, which is found experimentally, varies with the immersion fluid used; hence, the porosity determined depends on it, too. Organic fluids are recommended in standards for describing particle density for special applications; however, water is generally considered to be virtually inert when in contact with inorganic particles, particularly if the particles are composed of silicates. Thus, the results of measurements made using water as the immersion liquid are not considered to have been measurably affected by water. This paper shows that water does, in fact, alter measurably the value of silicate particle density obtained compared with measurements made using an organic fluid, viz., n-heptane. Explanations for this finding are under further consideration.

Keywords:
porosity, particle density, bulk density, measurement

Paper ID: GTJ10357J
DOI: 10.1520/GTJ10357J
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