A Two-Dimensional Amplitude Study of True-Amplitude Time Migration and Time Remigration – 2.5-D Synthetic Examples

Carlos Augusto Sarmento Ferreira, Karina P. Gomes, Alexandre S. Oliveira

Abstract


In this synthetic study, we present semi-automatically picked true-amplitude comparisons after time migration and time remigration (Tygel et al.,1996; and Oliveira et al.,2023). Since the examples considered are synthetic, emphasis is put on the generally disregarded dimensional aspects of the amplitudes that are modeled to simulate compressional-only seismic data when using a Kirchhoff a p proximation. By bearing in mind in this work that theoretical amplitudes work as “densities”, we show that when comparisons of true-amplitude weighted diffraction-stack time migration and weighted isochrone-stack time remigration are performed, in order to “correct” the dimensions involved certain multiplicative physical constants must come into play and that must be effectively dealt with, for plotting reasons.

Keywords


Amplitude density; dimensional scaling factors; synthetic seismic modeling; weight-functions; Kirchhoff approximation

Full Text:

PDF

References


Bevc, D., J. L. Black, and G. Palacharla, 1995, Plumes: Response of time migration to lateral velocity variation: Geophysics, 60, 1118–1127, doi: https://doi.org/10.1190/1.1443840.

Black, J. L., and M. A. Brzostowski, 1994, Systematics of time-migration errors: Geophysics, 59, 1419–1434, doi: https://doi.org/10.1190/1.1443699.

Bleistein, N., 1986, Two-and-one-half dimensional in-plane wave propagation: Geophysical Prospecting, 34, 686–703, doi: https://doi.org/10.1111/j.1365-2478.1986.tb00488.x.

Fomel, S., 2003, Velocity continuation and the anatomy of residual prestack time migration: Geophysics, 68, 1650–1661, doi: https://doi.org/10.1190/1.1620639.

Hubral, P., J. Schleicher, and M. Tygel, 1996, A unified approach to 3-D seismic reflection imaging, part I: Basic concepts: Geophysics, 61, 742–758, doi: https://doi.org/10.1111/j.1365-246X.1996.tb00009.x.

Martins, J., J. Schleicher, M. Tygel, and L. Santos, 1997, 2.5-D true-amplitude Kirchhoff migration and demi- gration: Journal of Seismic Exploration, 6, 159–180, doi: 0963-0651/97.

Martins, J. L., 2001, Migração, demigração e imageamento em 2.5D com inclusão de alguns casos analíticos: PhD thesis, 107p. UNICAMP, Campinas-SP.

O’Doherty, R., and N. A. Anstey, 1971, Reflections on amplitudes: Geophysical Prospecting, 19, 430–458, doi: https://doi.org/10.1111/j.1365-2478.1971.tb00610.x.

Oliveira, A. D. S., and C. A. S. Ferreira, 2009, Modeling of a synthetic presalt 2-D seismic dataset representative of offshore east margin basins (Brazil)–preliminary results: Presented at the 11th International Congress of the Brazilian Geophysical Society, Salvador-BA, Brazil. doi: https://doi.org/10.1190/sbgf2009-300.

Oliveira, A. D. S., C. A. S. Ferreira, and J. Lourenço, 2023, Kirchhoff time-remigration and time-to-depth conversion – preliminar studies and possible applications: Presented at the 18th International Congress of the Brazilian Geophysical Society, Rio de Janeiro-RJ, Brazil.

Schleicher, J., and C. Bagaini, 2004, Controlling amplitudes in 2.5-D common-shot migration to zero offset: Geophysics, 69, 1299–1310, doi: https://doi.org/10.1190/1.1801946.

Schleicher, J., M. Tygel, and P. Hubral, 1993, 3-D true-amplitude finite-offset migration: Geophysics, 58, 1112–1126, doi: https://doi.org/10.1190/1.1443495.

Sheriff, R. E., 1975, Factors affecting seismic amplitudes: Geophysical Prospecting, 23, 125–138, doi: https://doi.org/10.1111/j.1365-2478.1975.tb00685.x.

Tygel, M., J. Schleicher, and P. Hubral, 1994, Pulse distortion in depth migration: Geophysics, 59, 1561–1569, doi: https://doi.org/10.1190/1.1443545.

Tygel, M., J. Schleicher, and P. Hubral, 1996, A unified approach to 3-D seismic reflection imaging, part II: Theory: Geophysics, 61, 759–775, doi: https://doi.org/10.1190/1.1444002.

Tygel, M., J. Schleicher, P. Hubral, and C. Hanitzsch, 1993, Multiple weights in diffraction stack migration: Geophysics, 58, 1820–1830, doi: https://doi.org/10.1190/1.1443397.

Tygel, M., J. Schleicher, P. Hubral, and L. T. Santos, 1998, 2.5-D true-amplitude Kirchhoff migration to zero offset in laterally inhomogeneous media: Geophysics, 63, 557–573, doi: https://doi.org/10.1190/1.1444356.




DOI: http://dx.doi.org/10.22564/brjg.v42i2.2319

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.





 

>> Brazilian Journal of Geophysics - BrJG (online version): ISSN 2764-8044
a partir do v.37n.4 (2019) até o presente

Revista Brasileira de Geofísica - RBGf (online version): ISSN 1809-4511
v.15n.1 (1997) até v.37n.3 (2019)

Revista Brasileira de Geofísica - RBGf (printed version): ISSN 0102-261X
v.1n.1 (1982) até v.33n.1 (2015)

 

Brazilian Journal of Geophysics - BrJG
Sociedade Brasileira de Geofísica - SBGf
Av. Rio Branco 156 sala 2509
Rio de Janeiro, RJ, Brazil
Phone/Fax: +55 21 2533-0064
E-mail: editor@sbgf.org.br

Since 2022, the BrJG publishes all content under Creative Commons CC BY license. All copyrights are reserved to authors.

Creative Commons