Seismic imaging apparatus and method using iterative direct waveform inversion

摘要

The present invention relates to an acoustic wave imaging technique, and relates to an imaging technique for modeling an underground structure by updating a velocity model of each frequency band in ascending order of frequency, descending order of frequency, or arbitrary order.One challenge the present invention addresses is to directly calculate the difference between the actual under-surface velocity and the initial estimated velocity.In order to visualize the underground structure of the measurement area according to one aspect, the elastic wave imaging device using the repetitive application of direct waveform inversion utilizes a virtual scattering source and a parameter perturbation calculated from the updated reference wave field A waveform inversion section for updating the reference velocity model by updating the reference velocity model updated in the previous frequency band in a ascending order of frequencies, a descending order of frequencies, or an arbitrary order to the reference velocity model of the next frequency band, And an underground structure imaging unit for imaging the underground structure from the model.