1887

Abstract

Summary

The marine seismic exploration with the ocean bottom cable (OBC) technology could record the compressional (P-) wave and shear (S-) wave information simultaneously. Elastic full waveform inversion (EFWI) uses both P- and S-waves of OBC data to invert multi-parameters with adequate amplitude information and complete illumination of the subsurface. We use different formats of wave equation in fluid and solid mediums, and the appropriate boundary condition applied enables the energy exchange on the interface, which is more stable and efficient than the traditional integrated simulation scheme. However, if the fluid-solid coupled medium has an extremely irregular seabed interface, the conventional rectangular-grid-based finite difference (RFD) method cannot obtain accurate source and receiver wavefields. We introduce the curvilinear coordinates to overcome the problem of the RFD method on handling the irregular fluid-solid interface. To reduce the crosstalk of inverted P- (Vp) and S-velocities (Vs), we derive the direction formulas of Vp and Vs based on P- and S-wave modes separation in the curvilinear coordinates, and finally propose a Curvilinear-grid-based Fluid-Solid Separated- wavefield EFWI (CFS-SEFWI) method. In the numerical examples, a modified Marmousi II model with irregular fluid-solid interfaces is used to test the proposed CFS-SEFWI method.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201900639
2019-06-03
2020-03-31
Loading full text...

Full text loading...

References

  1. Tarantola, A.
    , 1984, Inversion of Seismic Reflection Data in the Acoustic Approximation: Geophysics, 49, 1259–1266.
    [Google Scholar]
  2. Köhn, D., D.De Nil, A.Kurzmann, A.Przebindowska, T.Bohlen
    , 2012On the Influence of Model Parametrization in Elastic Full Waveform Tomography: Geophysical Journal International, 191, 325–345.
    [Google Scholar]
  3. Qu, Y., J.Huang, Z.Li, and J.Li
    , 2017. A Hybrid Grid Method in an Auxiliary Coordinate System for Irregular Fluid-Solid Interface Modeling: Geophysical Journal International, 208, 1540–1556.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201900639
Loading
/content/papers/10.3997/2214-4609.201900639
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error