The invention relates to the technical field of geophysical exploration, and particularly discloses a
full waveform inversion and
tomography inversion combined velocity modeling method and device, and the method comprises the steps: building an initial
tomography velocity model; establishing a full-
waveform inversion velocity model in a layering manner based on the initial
chromatography velocity model by using the refracted
waves and the
reflected waves; performing pre-stack depth migration
imaging quality control on the full-
waveform inversion velocity model; and sequentially performing high-precision
chromatography inversion iteration on the full-
waveform inversion velocity model to obtain a combined velocity model. According to the full-waveform inversion and
tomography inversion combined speed modeling method provided by the invention, the high-precision speed model is established by combining full-waveform inversion and tomography inversion technologies, so that the
spatial distribution position and the relatively accurate speed of
igneous rock can be inverted, the inversion precision of the
igneous rock speed model is improved, and the calculation accuracy of the
igneous rock speed model is improved. The space boundary and the position of the igneous rock are finely depicted, the imaging influence of the speed on the periphery of the igneous rock and an underlying stratum is eliminated, and the imaging precision is improved.