Impact of the Imaging Velocity on 4D Qi and Seismic History Matching

Managing uncertainty in 4D quantitative interpretation is important for calibrating the production data and 4D seismic, pressure-saturation inversion, sim2seis analysis, and closing the loop by Seismic History Matching (SHM). Here we will demonstrate the impact of imaging velocity on the 4D QI and seismic history matching. The uncertainties in the migration velocity model have been assessed based on the 4D imaging scan approach. The seismic history matching was performed using observed seismic (legacy and the seismic data migrated with velocity model refined by 4D image scan approach). The results show a change in saturation with an average of 5–6% over the entire reservoir and 10% around injectors, and also very good improvement in seismic history matching using observed data of the 4D image scan model over the legacy 4D seismic