High-resolution prestack seismic inversion using a hybrid FISTA least-squares strategy

By Daniel O. Pérez, D. Velis, Mauricio D. Sacchi. 2013

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ABSTRACTA new inversion method to estimate high-resolution amplitude-versus-angle attributes (AVA) attributes such as intercept and gradient from prestack data is presented. The proposed technique promotes sparse-spike reflectivities that, when convolved with the source wavelet, fit the observed data. The inversion is carried out using a hybrid two-step strategy that combines fast iterative shrinkage-thresholding algorithm (FISTA) and a standard least-squares (LS) inversion. FISTA, which can be viewed as an extension of the classical gradient algorithm, provides sparse solutions by minimizing the misfit between the modeled and the observed data, and the l1-norm of the solution. FISTA is used to estimate the location in time of the main reflectors. Then, LS is used to retrieve the appropriate reflectivity amplitudes that honor the data. FISTA, like other iterative solvers for l1-norm regularization, does not require matrices in explicit form, making it easy to apply, economic in computational terms, and ad...

Subfields: Geophysics, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/b3eaf9ab91fe7f1dcc0bc2637e0171bf3fc7e7ff