Prestack depth migration of primary and surface-related multiple reflections, Part II: Identification and removal of residual multiples

Details

Serval ID
serval:BIB_99F77BF4724A
Type
Article: article from journal or magazin.
Collection
Publications
Title
Prestack depth migration of primary and surface-related multiple reflections, Part II: Identification and removal of residual multiples
Journal
Geophysics
Author(s)
Muijs R., Robertsson J., Holliger K.
ISSN-L
0016-8033
Publication state
Published
Issued date
2007
Peer-reviewed
Oui
Volume
72
Pages
S71-S76
Language
english
Notes
Muijs2007
Abstract
Depth imaging using primary and multiple reflections (DIPMR), as described
in Part I of this study, allows subsurface information carried by
multiple reflections to be utilized. In the presence of strong lateral
heterogeneity, however, the migration results may be distorted by
artifacts originating from reflections associated with layers above
the imaging plane that are commonly referred to as crosstalk. We
present an image enhancement procedure that allows such artifacts
to be effectively suppressed by predicting the initial crosstalk
in a second migration phase. This second migration uses reflections
imaged at shallower depth levels and requires knowledge of the total
and primary downgoing wavefield at the receiver level. The predicted
crosstalk image it-self may assist the interpretational effort by
indicating areas where artifacts may result in incorrect identification
of geologic structures or may cause local distortions of amplitude
informa-tion. Furthermore, a clean depth image can be obtained by
adap-tively subtracting the predicted crosstalk-related noise from
the original image. The proposed method is an extension of the DIPMR
procedure outlined in Part I of this study. However, it is also applicable
to seismic data imaged by using conventional mi gration techniques
that are based exclusively on primary reflec-tions. In the latter
case, the enhancement procedure allows the ef-fects of imperfect
multiple removal during preprocessing to be revealed in the migrated
sections. When applied to synthetic data simulated for a complex
salt model, the proposed enhancement procedure proved to be valid
and effective.
Create date
25/11/2013 18:27
Last modification date
20/08/2019 15:01
Usage data