The strong contrast between the ideal baseline survey and a production influenced monitor survey has allowed for a detailed interpretation of reservoir changes due to production to be made. However, observable time-lapse differences are a result of multiple factors, in which reservoir changes are one of many constituents. Differences in survey acquisition, processing, and near surface velocities during data acquisition can reduce the repeatability of a monitor survey, altering the phase, amplitude and static solution between surveys. The monitor survey was calibrated to match the phase, amplitude and statics to those of the baseline, effectively enhancing production- induced changes while suppressing differences created by other factors.
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