New approaches in optimization of calculation of wave fields directly related to the selected target area of seismic response, authors Shalashnikov A.V. & Finikov D.B. (Seismotech, Ltd./Moscow), Khokhlov N.I. & Ivanov A.M. (Laboratory of applied computational Geophysics, MFTI/Dolgoprudny).
The report describes the method of calculating and verification of wave field of reflected waves of a certain type of polarization from localized target objects of environment. A special feature of the method is the combination of the wave field continuation operator calculated by means of layer-by-layer recalculation based on the Kirchhoff integral and the finite-difference modelling operator of reflected waves. Parameterization of the wave field continuation operator type is determined on the basis of the frame effective velocity-depth model. The combination of these methods allows: to localize the structure of reflected waves; to reduce the numerical cost of modeling by limiting the use of expensive finite difference operator by the borders of the target area; to eliminate the problems of the finite-difference operator of wave field transformation in complex (for example, low-velocity), but not target areas. The simulation results were verified by means of migration.
We executed the competitive analysis of the received depth AVA-gathers and synthetic gathers, which dynamic was defined by the solution of the vector equation system for plane waves for the continuity of displacements and stresses at the discontinuity boundaries of elastic parameters.
