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AAPG Bulletin, Vol. 90 (2006), Program Abstracts (Digital)

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

ABSTRACT: Removing Multiples or Using Multiples: New Challenges for Land Previous HitDataNext Hit

Eric Verschuur
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 Previous HitmarineNext Hit application. Especially the so-called Previous HitdataNext Hit-driven methods, where the Previous HitseismicNext Hit Previous HitdataNext Hit is used as a multiple prediction operator, have been quite successful for the Previous HitmarineNext Hit case. In the last decade, more effort has been put in translating these methodologies for the land Previous HitdataNext Hit situation. It appears that the multiple problem for land Previous HitdataNext Hit can be quite different from the Previous HitmarineNext Hit 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 Previous HitdataNext Hit appears much lower, or surface multiple energy may not be always recognized as such. Besides this issue, the Previous HitdataNext Hit quality and Previous HitacquisitionNext Hit geometries are quite different from the Previous HitmarineNext Hit case. Therefore, a lot of attention need be paid to carefully pre-processing the land Previous HitseismicNext Hit Previous HitdataNext Hit for use in Previous HitmarineNext Hit-type algorithms. Despite these issues, both surface-related and internal multiple removal strategies have been applied to land Previous HitdataNext Hit with success, which will be demonstrated in this paper. Furthermore, the next challenge is to utilize information in land Previous HitdataNext Hit multiples to learn something about the near surface properties or to fill in missing Previous HitdataTop. Therefore, some hints will be given of transforming multiples from a source of troubles into a source of information.

 

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