The study raises an important consideration: the mesh discretization can have a large effect on reservoir impedance in numerical simulation. As the number of nodes increased from 1300 to 600,000, the reservoir impedance increased from 38 to 48 kPa-s/kg. Through extrapolation, predicted that an infinite number of nodes would lead to a reservoir impedance of 58 kPa-s/kg. It is difficult to know if the impedance asymptotes to a fixed value as the number of nodes goes to infinity. If this asymptote does exist, it is also difficult to know what its value of impedance will be. work suggests that getting an accurate reservoir impedance value using a numerical simulator requires nearly infinite computational resources.