Naturally fractured reservoirs are becoming increasingly important for oil and gas exploration in many areas of the World. Because fractures may control the permeability of a reservoir it is important to be able to find and characterise fractured zones. In order to characterise a fractured reservoir we need to understand the effect the fractures will have on its overall elastic properties. Fractures are highly compliant compared to the relatively stiff pores, so fluid will flow between pores and fractures during passage of the seismic wave. In this book we investigate the dependency of...