The proposed method was applied to a modified 2D Marmousi model (Bourgeois et al., 1991).
For simplicity, we neglect overburden geomechanical changes and assume no change in reflectivity, except within the reservoir (Figure 3(a)).
Using a Born modeling algorithm, we simulated
data sets representing different production stages (Figure 4).
Each data set comprises
randomly encoded shot records with unique shot positions and unique relative shot-timings (Figure 5).
We estimated the dip-field and dip-contrast (Figures 3b and c) from the migrated baseline image.
For data modeling and migration, we use a phase-encoding one-way wave-equation operator.
For comparison, using the same number of shots and receivers and perfect repeatability, we modeled and migrated
conventional data sets.
The migrated and inverted images, together with the corresponding time-lapse images, are shown in Figures 6 to 8.
2010-05-19