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Crosshole Seismic Tomography Including the Anisotropy EffectNormal access

Authors: Y. Rao and Y. H. Wang
Event name: 73rd EAGE Conference and Exhibition incorporating SPE EUROPEC 2011
Session: Wellbore Data Processing -/- Full Waveform Inversion II
Publication date: 23 May 2011
DOI: 10.3997/2214-4609.20149052
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 494.66Kb )
Price: € 20

Velocity anisotropy caused by fine-layering makes strong effect to the travel path with large vertical offset in crosshole seismic data. This effect must be considered in seismic waveform tomography, so that the inversion procedure can match the waveforms in real data. In this paper, we proposal to properly take account this anisotropic effect in two stages. First, we invert for the anisotropy parameter simultaneously with the (horizontal) velocity in travel time tomography. Then we incorporate this estimated anisotropy parameter model in waveform simulation for waveform tomography, to refine the velocity image. When considering this anisotropic effect, far-offset data are properly used in the inversion, then both travel time and waveform tomography may have a better ray coverage, producing a velocity image with a better resolution.

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