In 3D model-based tomography, velocity parameters are represented along the depth model horizons. The velocity parameters and the depth structure are updated along the background structural model. Unlike grid-based tomography, in which only the velocity parameters are updated on a predefined coarse 3D grid, model-based tomography updates both the velocity field along the geological layers and the location of subsurface horizons.
The number of parameters to be inverted in model-based tomography is generally much fewer than in grid-based tomography. Therefore, there is no need for direct model-based tomography.
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Detailed background structure and velocity model, used as input for Paradigm model-based tomography |
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