f Virtual Outcrop of Geological Analogue integrated to a complete workflow for evaluating Enhanced Oil Recovery

We illustrate how a 3D digital geological model constructed from the numerous geological observations on an outcrop located close to Ainsa town (southern Pyrenees, Spain), and extensively studied as an analogue of reservoirs of offshore West Africa, is integrated to a complete workflow for simulating different scenarios of reservoir exploitation, including various types of combinations of alkaline (A), surfactant (S) and polymer (P). The workflow goes from geological description to seismic monitoring simulation and seismic attributes analysis, through geological and reservoir modelling, flow simulation and rock physics modelling (see Figure 1). The efficiency of chemical enhanced oil recovery is demonstrated, and successfully compared to conventional water flooding. For each process, the link is clear between the cube of oil saturation variation and the corresponding seismic attribute cube both put in the baseline time. The limit of the swept zone is clearly visible on seismic cubes. Hence, seismic monitoring between the injection and the production wells clearly allows to anticipate the success or the breakdown of the process, in order to optimize the operations in the field.