Кінематична та динамічна обробка сейсмічних даних вздовж профілю EUROBRIDGE’97

The article presents the principal procedures for kinematic and dynamic processing of wavefields observed using the deep Wide-Angle Reflection and Refraction seismic profiling method. It demonstrates that combining their results enhances the level of subsequent interpretation. Kinematic processing of seismic data is a conventional approach, typically based on ray-tracing modeling, which produces a calculated velocity model of the medium. These velocity parameters are the input data for dynamic processing. Dynamic processing operates with the amplitude-frequency and phase characteristics of the wavefield, involving the construction of an image of the deep section with its existing interfaces and tectonic features of the study area. In global practice, the main procedures of dynamic processing include various migration techniques; however, they are not designed for processing WARR data recorded at large distances of several hundred kilometers from the source. At the S. Subbotin Institute of Geophysics of National Academy of Sciences of Ukraine, a specialized finite-difference migration method for reflected/refracted waves has been developed specifically for Wide-Angle Reflection and Refraction data processing. Both kinematic and dynamic processing were applied to wavefields recorded along the EUROBRIDGE’97 seismic profile. Two alternative velocity models are presented, showing a similar overall structure along the profile down to a depth of 15 km, along with a migrated image to the same depth obtained using the finite-difference migration method for reflected/refracted waves. Application of dynamic processing to the seismic dataset has, for the first time, produced an image of the deep structure of the crystalline basement along the EUROBRIDGE’97 profile, providing additional structural details to the results of kinematic processing.