oa Numerical analysis of passive seismic emission tomography using oscillation caused by multiphase flow method

In recent years, development of a monitoring technique (Passive Seismic Emission Tomography method: PSET) using vibration generated in the reservoir has been widely progressed. However, monitoring with PSET only estimates the extent of the reservoir. Moreover, its theoretical knowledge is lacking at present. On the other hand, we proposed a method to monitor underground from vibration caused by fluid flow inside the reservoir. We are conducting research based on the hypothesis that the difference in the fluid in the reservoir is reflected to the seismic wave generated in the reservoir. In the previous research, we showed that it is possible to visualize the reservoir area by measuring the seismic wave caused by the two-phased oil and water flow for a long time. In this study, we calculate seismic waves using the Green’s function occurring with water-oil two-phase flow and gas-oil two-phase flow. As a result, the vibration caused by the flow of the fluid not only indicates the flowing area but also information on the properties of the fluid. It is suggested that this result may be effective as a method to monitor the change of the fluid properties in the reservoir associated with oil production and enhanced oil recovery method.