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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
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.