Misure di laboratorio di proprietà petro-fisiche di rocce carbonatiche mesozoiche, (NW) Grecia

The purpose of this thesis is the petrophysical characterization of 53 rock samples with the aim to evaluate the porosity-permeability relationship of Mesozoic carbonate host rocks and fault breccias collected from outcrops of the Araxos Promontory (NW) Greece. Host rocks consist of Senonian and Vigla formation made of carbonate mudstones, wackestones, packstones and sedimentary breccias, while fault breccias derive from high-angle extensional and strike-slip fault zone. Laboratory measurements of physical properties such as density, porosity, VP, VS and electrical resistivity in dry and saturated conditions have been performed at room pressure and temperature. From these data, dynamic elastic moduli, textural anisotropy, crack density, and permeability have been evaluated for each rock sample. Correlations among VP/VS, porosity, resistivity and permeability have been investigated. Selected samples were also tested in pressure vessels at incremental effective pressures up to 80 MPa, while measuring seismic velocities and permeability. Results show a wide range of physical properties and porosity values up to 5-10 times higher for fault breccias, while a slight textural anisotropy and low permeabilities/porosities are found for host rocks and for some crush breccias where secondary cementation appear to control the mechanical response