FAST TRACK PAPER: Evaluation of elastodynamic interferometric redatuming: a synthetic study on salt dome flank imaging

Details FAST TRACK PAPER: Evaluation of elastodynamic interferometric redatuming: a synthetic study on salt dome flank imaging FAST TRACK PAPER: Evaluation of elastodynamic interferometric redatuming: a synthetic study on salt dome flank imaging

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.176..889l&link_type=abstract

Geophysical Journal International, Volume 176, Issue 8, pp. 889-896.

Astronomy and Astrophysics

Astronomy

Numerical Approximations And Analysis, Downhole Methods, Interferometry, Wave Scattering And Diffraction, Wave Propagation

Scientific paper

The recent introduction of novel redatuming techniques, based on the principles of time-reversed acoustics and source-receiver reciprocity, has allowed seismic measurements collected on one datum to be extrapolated to another datum. Under favourable conditions, this process can approximately remove the complicated overburden structures without any velocity information. We introduce an elastic redatuming scheme for walkaway vertical seismic profiles (WVSPs) based on these principles, using P- and S-wave potentials, which are derived from the spatial derivatives of the measured wavefields. Additional field acquisition is utilized to directly measure these derivatives. We test our elastic redatuming scheme on data simulated with an elastic finite difference algorithm. The elastodynamic Green's functions between multicomponent receivers in a borehole are then extracted from data recorded using multicomponent (P- and S-wave) sources at the surface. The wavefields are redatumed as four parts: two related to the P-wave potential, and another two related to the S-wave potential. These parts are migrated separately and form four independent images of the salt dome flank, providing a more complete elastic description of the subsurface.

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