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![]() | Joint inversion of simultaneous source time-lapse seismic data sets | ![]() |
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The data consist of two sets of 29 encoded shot records over the 8x8 m grid model at different production stages.
In this example, because we use a known background baseline velocity model, both data sets are fully encoded.
The random encoding function, with a maximum delay of 1 s, is different for each data set.
Shot positions vary randomly between surveys with a maximum displacement of m, whereas the receiver array is the same for both surveys and fixed for all shots.
Dips were computed from a single source migrated baseline image (not shown).
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marm-vel
Figure 1. 2D Marmousi velocity model.[ER] |
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Figures 2 shows the baseline and monitor data sets. The downgoing baseline and monitor source wavefields at time 0.52 s are shown Figure 3. The single and simultaneous source migrated monitor images are shown in Figures 4(a) and 4(b), respectively. The inverted simultaneous source monitor image obtained from J-PLSI is shown in Figure 4(c). Figure 5 shows the migrated and inverted time-lapse images. Note that the cross-term artifacts in the migrated time-lapse image (Figure 5(b)) are significantly attenuated in the inverted image (Figure 5(c)). The weighted RMS difference (non-repeatability) between the migrated and inverted images are shown in Figure 6.
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![]() | Joint inversion of simultaneous source time-lapse seismic data sets | ![]() |
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