Full waveform inversion of multi-component OBC seismic data (extended abstract)

Sears, T. J. and Singh, S. C. and Barton, P. J. (2005) Full waveform inversion of multi-component OBC seismic data (extended abstract). In: 67th EAGE conference and exhibition. European Association of Geoscientists & Engineers, Madrid, Spain, June 2005, pp. 2287-2290. ISBN 9073781981

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Advances in computer technology have made full waveform inversion a more realistic and achievable process. In addition to overcoming the computational challenges involved, the inverse problem itself has been helped through different techniques. The use of long-offset data and preliminary inversion of lower frequencies are seen to mitigate problems of non-linearity. Medium wavelength features thought missing from near offset reflection data may then be resolved, and convergence to a unique solution is made possible. However, while the inversion of compressional (P) -wave velocity from marine streamer data is more readily achieved, inversion for shear (S) -wave velocity remains difficult. Through the use of multi-component ocean bottom cable (OBC) seismic data, we aim to further improve the waveform inversion process by exploiting the wavefield recorded at the sea-floor, leading to quantification of P- and S-wave velocities. We have tested our inversion technique on 1D and 2D synthetic data sets, and then applied to real OBC data from the North Sea. We find that both P and S-wave velocities can be retrieved from hydrophone data alone for a model with high velocity contrast at the seafloor that produces a strong conversion. However, for low velocity contrast and real data, both horizontal and vertical component of data are necessary to extract P and S-wave velocities.

Item Type: Book Section
Uncontrolled Keywords: 2005 AREP 2005 P IA49
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Page Range: pp. 2287-2290
Depositing User: Sarah Humbert
Date Deposited: 01 Nov 2011 16:46
Last Modified: 23 Jul 2013 09:58
URI: http://eprints.esc.cam.ac.uk/id/eprint/1552

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