Two-dimensionalPP/PS-stereotomography:P- andS-waves velocities estimation from OBC data

Autor: Pascal Podvin, Gilles Lambaré, Reda Baina, M. Alerini, S. Le Bégat

Publikováno v: Geophysical Journal International. 170:725-736

SUMMARY We present the extension of stereotomography to P- and S-wave velocity estimation from PP- and PS-reflected/diffracted waves. In this new context, we greatly benefit from the use of locally coherent events by stereotomography. In particular,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c03c7fb47187dee75f7e3fd3c54a4e4b
https://doi.org/10.1111/j.1365-246x.2007.03439.x

3D ray+Born migration/inversion—Part 1: Theory

Autor: Pascal Podvin, Gilles Lambaré, Stéphane Operto, Philippe Thierry

Publikováno v: GEOPHYSICS. 68:1348-1356

Prestack ray+Born migration/inversion can be split in two steps : the computation of common image gathers (CIGs) and their weighted stack (the migration stack). The choice of the domain for the CIGs (shot, offset, angle, etc.) has a direct impact on

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d7f2d37640eac615efbdc90d904201c3
https://doi.org/10.1190/1.1598128

3-D preserved amplitude prestack depth migration on a workstation

Autor: Philippe Thierry, Pascal Podvin, Mark Noble, Gilles Lambaré

Publikováno v: Geophysics
Geophysics, Society of Exploration Geophysicists, 1999, 64 (1), pp.222-229. ⟨10.1190/1.1444518⟩

We present an algorithm based on the ray+Born approximation for 3-D preserved amplitude prestack depth migration (PAPsDM) of seismic reflection data. This ray+Born inversion scheme allows the quantitative recovery of model perturbations. The Green’

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc1c609822073914f2fcb5926f1e3b99
https://doi.org/10.1190/1.1444518

3-D refraction traveltime tomography algorithm based on adjoint state techniques

Autor: Pascal Podvin, Hervé Chauris, Mark Noble, Cédric Taillandier, Henri Calandra

Publikováno v: Proceedings of 70th EAGE Conference and Technical Exhibition, Eur. Ass. of Geoscientists and Engineers
70th EAGE Conference and Technical Exhibition, Eur. Ass. of Geoscientists and Engineers
70th EAGE Conference and Technical Exhibition, Eur. Ass. of Geoscientists and Engineers, Jun 2008, Rome, Italy. pp.P163

International audience; Classical 3-D refraction traveltime tomography algorithms may suffer from computational limitations due to the large datasets that come from current seismic acquisition surveys. To overcome these issues, we suggest a 3-D refra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5c5e504e0897cf1f47867c4bcce366c4
https://hal-mines-paristech.archives-ouvertes.fr/hal-00535846

2D PP/PS-stereotomography: Application to a real 2D-OBC dataset

Autor: Pascal Podvin, Gilles Lambaré, M. Alerini, S. Le Bégat, Reda Baina

Publikováno v: Geophysical Prospecting
Geophysical Prospecting, Wiley, 2008, 56 (2), pp.213-227

International audience; It has been shown on an 'ideal' synthetic dataset that PP/PS-stereotomography can estimate an accurate velocity model without any pairing of PP- and PS-events. The P-wave velocity model is first estimated using PP data and the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::513b51d9aeb380e53ae0621c9b9a4013
https://hal-mines-paristech.archives-ouvertes.fr/hal-00569304