Data space vs. Image space

To compare the results of multiple elimination in the data space directly to the multiple elimination in the image space, we transformed our data-space substraction results into the image space. Figure  compares the same angle-domain common-image gathers for multiple removal in the data space and in the image space. The figure shows, from top to bottom: A) the migrated multiples model; B) the result of adaptive subtraction done in the data space, after migration; C) the result of adaptive subtraction done in the image space; and D) the migrated data set.

We observe that the multiples eliminated in the data space are also eliminated in the image space. However, some multiples were eliminated better in the image space, as, for example, the strong multiple at around 2800 m. Figure  compares the stack of the data space and image space results: from top to bottom, we have: A) the migration stack of the primaries obtained from the adaptive subtraction in the image space; B) the migration stack of the primaries obtained from the adaptive subtraction in the data space; and C) the migration stack of the original data set. Figure  compares the stack of migrated multiples models. From top to bottom, we have: A) the migrated multiple model; B) the estimated multiple section from the processing in the data space; and C) the estimated multiple section from the processing in the image space.

 

ispace_dspace
Figure 5 Comparison between multiple removal in the data space versus the image space. From top to bottom: A) Migrated multiple model; B) Primaries from the data space; C) Primaries from the image space; D) Migrated data.

 

is_ds_stack
Figure 6 Comparison between multiple removal in the data space versus the image space. From top to bottom: A) Migrated stack of primaries from the image space processing; B) Migrated stack of the primaries from the data space processing; and C) Migrated stack of the entire data set.

 

is_ds_mult
Figure 7 Comparison between multiple removal in the data space versus the image space. From top to bottom: A) Migrated stack of the multiple model; B) Estimated multiple section from the data space processing; and C) Estimated multiple section from the image space processing.