Statistics – Computation
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002geoji.151..325s&link_type=abstract
Geophysical Journal International, Volume 151, Issue 2, pp. 325-344.
Statistics
Computation
48
Finite-Difference Methods, Inversion, Seismic Modelling, Seismic Structure, Tomography, Waveform Analysis
Scientific paper
A 2-D full wavefield inversion method is presented for the processing of wide -aperture data. The diversity of information contained within such datasets may be handled in a complete manner by first matching the traveltimes of the main ev ents and then progressing to waveform fitting of the data through explicit full wavefield modelling. Our wavefield inversion scheme is based upon a finite diffe rence solution of the 2-D elastic wave equation in the time distance domain. The
strength of adopting such an approach is the ability to generate all possible w ave types within a given 2-D model (multiples, converted waves, etc.) and thus t o simulate and accurately model complex seismic wavefields. The aim of the inver sion is to find the 2-D P-wave velocity model that minimizes the least sq uared difference between the observed and synthetic data across the full range o f offsets. Following extensive testing on synthetic data, the wavefield inversio n scheme has been applied to wide-aperture real marine seismic streamer datasets . We present results from the synthetic testing and the wavefield inversion of w ide-aperture real data out to 12 km offset that was recorded on a single streame r. Even though current computational restrictions allow only a small subsection of the data to be analysed, these examples demonstrate the potential value of wi de-aperture 2-D full wavefield inversion.
Shipp Richard M.
Singh Satish C.
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