Quantifying the Porosity of Crystalline Rocks by In Situ and Laboratory Injection Methods

The porosity and pore geometry of rock samples from a coherent granodioritic body at the Grimsel Test Site in Switzerland was characterised by different methods using injection techniques. Results situ laboratory techniques are compared applying innovative resin impregnation as well mercury under conditions. In matrix shows an interconnected network throughout body, consisting mainly grain-boundary pores solution magmatic feldspar, providing important reservoir for water solutes, accessible diffusion. Porosity connectivity do not vary function distance to brittle shear zones. found be about 0.3 vol.%, which is half value that determined based on laboratory. Samples were dried impregnated affected artefacts created since core recovery, thus showed higher values than extrapolation measurements conditions requires great care may feasible all cases.