Patent ID: 9081115
Filing Date: 2015-07-14
Classification: G01V

Abstract:
1. A computer-implemented method for accelerating convergence of iterative inversion of seismic data to obtain a model of one or more physical parameters in a subsurface region, comprising: using local cost function optimization, wherein an assumed or current model is updated to reduce misfit between the seismic data and model-simulated data, wherein a frequency spectrum of the updated model is controlled in a first iteration and thereafter to match a known or estimated frequency spectrum for the subsurface region; wherein the controlling of the frequency spectrum comprises applying a spectral-shaping filter to a gradient of a cost function in model parameter space used to determine the update to the assumed or current model, said spectral-shaping filter being derived according to a criterion that the spectrum of the gradient of the cost function should match the known or estimated frequency spectrum for the subsurface region.