A linear, multiple degrees of freedom (MDOF), lumped-mass model was used to simulate the linear propagation of longitudinal wave (P wave) during static phase change during Carbon Dioxide (CO_2) injection in a multilayered elastic media. The most critical modeling consideration is the multi-physical phase change at the oil producing layer, which is simplified into stiffness reduction in the model. Five cases were studied with the stiffness of oil bearing layer changes as 100%, 90%, 80%, 70% and 60% of its original stiffness.
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