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SUMMARY:2D nonlinear inversion of walkaway data - Delprat-Jannaud\, F (Ins
 titut Francais du Petrole)
DTSTART:20111214T100000Z
DTEND:20111214T103000Z
UID:TALK34955@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:Well-seismic data such as vertical seismic profiles (VSP) prov
 ides detailed information about the elastic properties of the subsurface a
 t the vicinity of the well. Heterogeneity of sedimentary terrains can lead
  to non negligible multiple scattering\, one of the manifestations of the 
 non linearity involved in the mapping between elastic parameters and seism
 ic data. Unfortunately this technique is severely hampered by the 1D assum
 ption.\n\nWe present a 2D extension of the 1D nonlinear inversion techniqu
 e in the context of acoustic wave propagation. In the case of a subsurface
  with gentle\nlateral variations\, we propose a regularization technique w
 hich aims at ensuring the stability of the inversion in a context where th
 e recorded seismic waves provide a very poor illumination of the subsurfac
 e. We deal with a huge size nonlinear inverse problem. Solving this diffic
 ult problem is rewarded by a vertical resolution much higher than the one 
 obtained by standard seismic imaging techniques at distances of about one 
 hundred meters from the well. \n\n
LOCATION:Seminar Room 1\, Newton Institute
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