Abstract:In order to improve the efficiency of parameter inversion during VSP wavefield separation,the horizontal layered velocity model is established based on zero-offset VSP data.Then the ray parameters of different wavefields are calculated with forward ray tracing.These parameters are used to constrain the incident angle and the apparent slowness parameter of the downgoing and upgoing wavefields at different depths.This method makes the inversion converge quicker,and makes the inversion process more stable and effective,and avoids the frequency aliasing caused by local extreme values of inversion parameters.
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