Viscosity and Q in heavy-oil reservoir characterization

摘要

Springs and dashpots can be used for modeling the behavior of viscoelastic materials. Q can be estimated from the combined response of these components. Different configurations show different behaviors. Q in the Maxwell model is directly proportional to effective viscosity. It is inversely proportional in the Kelvin-Voigt model. The Zener model, a more general mechanical model, shows mixed behavior.rnSynthetic forward modeling shows that, when only Q changes in the reservoir while every other parameter is fixed, the response will change and the elastic approach is not able to correctly characterize it. Synthetic modeling also shows that steam zones can influence the viscoelastic crosswell seismic response more than the elastic response because changes in Q are not accounted for in elastic theory.