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Department of Civil Engineering, Sheffield City Polytechnic, , Pond Street, Sheffield SI 1WB
Samples of Fell Sandstone were taken from approximately every 3 m from the core material left at Shirlawhope Well, Longframlington, Northumberland. Most of the core remains and it extends to a depth of 94 m.
Various analyses were made at each 3 m depth interval. These included a modal analysis, particular attention being given to the cement and matrix material, as well as the void space; and a petrographic analysis of grain packing. Grain size analyses were also carried out at each depth to determine the individual median size and sorting coefficients. The absolute and effective porosities were obtained for each depth interval, together with permeabilities of intact specimens. The results of the individual parameters were compared statistically by means of correlation coefficients and Student's t tests in order to evaluate the significance of their relationships.
Porosity and permeability were shown to be influenced by void percentage and grain packing. Particle size distribution, however, does not influence porosity, although it has some influence on permeability. Cement-matrix content has little influence on porosity. A highly significant relationship was found to exist between effective porosity and permeability. Both porosity and permeability decrease with increasing depth from the surface.
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