Target-oriented Marchenko imaging of a North Sea field

Matteo Ravasi, Ivan Vasconcelos, A Kritski, Andrew Curtis, Carlos Alberto Da Costa Filho, Giovanni Meles

Research output: Contribution to journalArticlepeer-review

Abstract

Seismic imaging provides much of our information about the Earth's crustal structure. The principal source of imaging errors derives from simplistic modelled predictions of the complex, scattered wavefields that interact with each subsurface point to be imaged. A new method of wavefield extrapolation based on inverse scattering theory in mathematical physics produces
accurate estimates of these subsurface scattered wavefields, while still using relatively little information about the Earth’s properties. We use it for the first time to create real target-oriented seismic images of a North Sea field. We synthesise underside illumination from surface reflection data, and use it to reveal subsurface features that are not present in an image from conventional
migration of surface data. To reconstruct underside reflections, we rely on the so-called downgoing focusing function, whose coda consists entirely of transmission-born multiple scattering. As such, with the method presented here, we provide the first field data example of reconstructing underside
reflections with contributions from transmitted multiples, without the need to first locate or image any reflectors in order to reconstruct multiple scattering effects.
Original languageEnglish
Pages (from-to)99-104
JournalGeophysical Journal International
Volume205
Issue number1
Early online date10 Feb 2016
DOIs
Publication statusPublished - Apr 2016

Keywords

  • Wave propagation
  • Interferometry
  • Inverse Theory
  • Computational seismology
  • Body Waves

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