The Marmousi synthetic data set

The Marmousi synthetic data set (Bourgeois et al., 1991) was first released as a blind test for velocity estimation, but when the velocity model was revealed, it was discovered that many migration algorithms failed, so it has become a popular testbed for migration algorithms. It is a complex acoustic 2-D data set based on the geology of the Cuanza basin in Angola. The velocity model is shown in Figure . Its structural style is dominated by growth faults which arise from salt creep and give rise to the complicated velocity structure in the upper part of the model. The main imaging objective is the reservoir in the anticlinal structure below the salt.

The synthetic data set consists of 240 shots with 96 gathers each. The representative shot gathers in Figure  display complicated nonhyperbolic moveout, clearly indicating that this is a depth-imaging problem. Zero-phase source deconvolution was applied to the data used in this study as part of the preprocessing (Barut et al., 1991). The same four representative shot gathers are displayed after preprocessing in Figure .

 

velfig
Figure 1 The Marmousi velocity model.

 

marmshts
Figure 2 Shot gathers from the Marmousi synthetic data set. Some representative shot gathers from the Marmousi synthetic data set.

 

preshts
Figure 3 Shot gathers after processing. Representative shot gathers from the Marmousi synthetic data set after preprocessing. Movie.