Velocity Macro-Model Estimation by Wavefield Continuation – Application to GRUNDY 2003 Data

P176 VELOCITY MACRO-MODEL ESTIMATION BY WAVEFIELD CONTINUATION. APPLICATION TO GRUNDY 2003 DATA. Summary 1 In this paper a brief outline of the theory of transforming the data to the τ-p domain and the downward continuation of seismic wavefield are given. A synthetic example was used to illustrate the differences between 2D slant stack and the cylindrical slant stack. The described methodology was applied to the selected shot gathers from integrated refraction-reflection experiment located in central Poland called GRUNDY 2003. 1D velocity functions extracted from downward continued z-p images were used for determining a quasi 2D model which was then used