Time-domain incomplete Gauss-Newton full-waveform inversion of Gulf of Mexico data

Abdullah AlTheyab*, Xin Wang, Gerard Schuster

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations

Abstract

We apply the incomplete Gauss-Newton full-waveform inversion (TDIGN-FWI) to Gulf of Mexico (GOM) data in the space-time domain. In our application, iterative least-squares reverse-time migration (LSRTM) is used to estimate the model update at each non-linear iteration, and the number of LSRTM iterations is progressively increased after each non-linear iteration. With this method, model updating along deep reflection wavepaths are automatically enhanced, which in turn improves imaging below the reach of diving-waves. The forward and adjoint operators are implemented in the space-time domain to simultaneously invert the data over a range of frequencies. A multiscale approach is used where higher frequencies are down-weighted significantly at early iterations, and gradually included in the inversion. Synthetic data results demonstrate the effectiveness of reconstructing both the high- and low-wavenumber features in the model without relying on diving waves in the inversion. Results with Gulf of Mexico field data show a significantly improved migration image in both the shallow and deep sections.

Original languageEnglish (US)
Pages (from-to)5175-5179
Number of pages5
JournalSEG Technical Program Expanded Abstracts
Volume32
DOIs
StatePublished - Jan 1 2013
EventSEG Houston 2013 Annual Meeting, SEG 2013 - Houston, United States
Duration: Sep 22 2011Sep 27 2011

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geophysics

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