Click to view page image in pdf format.
7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
Land
Data
Applied Physics, Delft University of Technology, P.O. Box 5046, Delft 2600 GA Netherlands, phone:
+31152782403, fax: +31 15 2625403, [email protected]
Most of the approaches to remove multiples – both surface-related as well as internal multiples- have been geared towards
the marine application. Especially the so-called data-driven methods, where the seismic data is used as a multiple
prediction operator, have been quite successful for the marine case. In the last decade, more effort has been put in
translating these methodologies for the land
data situation. It appears that the multiple problem for
land
data can be quite
different from the marine case: the clear, almost perfect, mirror at the water surface is being replaced by a fuzzy reflector for
the
land
situation, where besides reflection at the free surface other phenomena play a role, like near surface scattering,
internal multiple generation by shallow reflectors and conversion from P-wave to S-wave energy. That is why the surface
multiple content in
land
data appears much lower, or surface multiple energy may not be always recognized as such.
Besides this issue, the data quality and
acquisition
geometries are quite different from the marine case. Therefore, a lot of
attention need be paid to carefully pre-processing the
land
seismic data for use in marine-type algorithms. Despite these
issues, both surface-related and internal multiple removal strategies have been applied to
land
data with success, which will
be demonstrated in this paper. Furthermore, the next challenge is to utilize information in
land
data multiples to learn
something about the near surface properties or to fill in missing data. Therefore, some hints will be given of transforming
multiples from a source of troubles into a source of information.