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Transmission + reflection anisotropic wave-equation traveltime and waveform inversionNormal access

Authors: S. Feng and G.T. Schuster
Journal name: Geophysical Prospecting
Issue: Vol 67, No 2, February 2019 pp. 423 - 442
DOI: 10.1111/1365-2478.12733
Organisations: Wiley
Language: English
Info: Article, PDF ( 14.87Mb )

Summary:
A transmission + reflection wave-equation traveltime and waveform inversion method is presented that inverts the seismic data for the anisotropic parameters in a vertical transverse isotropic medium. The simultaneous inversion of anisotropic parameters vp0 and is initially performed using transmission wave-equation traveltime inversion method. Transmission wave-equation traveltime only provides the low-intermediate wavenumbers for the shallow part of the anisotropic model; in contrast, reflection wave-equation traveltime estimates the anisotropic parameters in the deeper section of the model. By incorporating a layer-stripping method with reflection wave-equation traveltime, the ambiguity between the background-velocity model and the depths of reflectors can be greatly mitigated. In the final step, multi-scale fullwaveform inversion is performed to recover the high-wavenumber component of the model. We use a synthetic model to illustrate the local minima problem of fullwaveform inversion and how transmission and reflection wave-equation traveltime can mitigate this problem.We demonstrate the efficacy of our new method using field data from the Gulf of Mexico.

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