f The Inter Relationships between Velocity, Stress, Pore Fluid and Permeability in Clean Sandstones

Seismic compressional- and shear- wave velocities and attenuation were measured on a number of shoreface facies sandstone samples from a hydrocarbon reservoir of the North Sea. The samples show a wide range of permeabilities (between 10 md and 600 md) and relatively similar porosities (about 20%) and composition (96% quartz). The samples differ only in their average grain sites (from 100 μm up to 400 μm) which is believed to be the main factor controlling their permeability. The measurements were conducted at room temperature and at confining pressures ranging from 5 Mpa up to 45 MPa. The measurements were carried out in vacuum dry, brine- and kerosene- saturated samples. In the case of fully saturated samples, the pore fluid pressure was kept at 5 MPa.