Data-driven time imaging of 2D acoustic media without a velocity model

A test case illustrates the potentiality of a new non-hyperbolic formulation approximating the time of flight of diffracted acoustic signals propagating in a 2D non-homogeneous medium. The traveltime expression is based on the primary kinematic response of a diffractor and is calculated with respect to a reference ray emerging with an elevation angle a0 and carried to the surface by a wavefront with radius of curvature R. First, the problem is formulated in the auxiliary homogeneous medium. The resulting time of flight is then used to synchronize, via a homeomorphic transformation, the real medium wavefront to that of the auxiliary one. The final formula has been implemented, within a unique data-driven imaging procedure, to stack seismic traces to offset zero or time migrate them before stacking without a velocity model.

@InProceedings{BCCM12,
  author       = {Bonomi, E. and Caddeo, G. and Cristini, A. and Marchetti, P.},
  title        = {Data-driven time imaging of 2D acoustic media without a velocity model},
  booktitle    = {Proceedings of 82nd Annual Meeting and International Exposition of the Society of Exploration Geophysics-SEG, Las Vegas - Nevada},
  year         = {2012},
  keywords     = {time imaging, seismic diffraction, data-driven method, hpc},
  url          = {https://publications.crs4.it/pubdocs/2012/BCCM12},
}