From tomography to full-waveform inversion with a single objective function
نویسندگان
چکیده
منابع مشابه
Full waveform inversion guided by travel time tomography
Full waveform inversion (FWI) is a process in which seismic data in time or frequency domain is fit by changing the velocity of the media under investigation. The problem is non-linear, and therefore optimization techniques have been used to find a geological solution to the problem. The main problem in fitting the data is the lack of low spatial frequencies. This deficiency often leads to a lo...
متن کاملFull waveform inversion with image-guided gradient
The objective of seismic full waveform inversion (FWI) is to estimate a model of the subsurface that minimizes the difference between recorded seismic data and synthetic data simulated for that model. Although FWI can yield accurate and high-resolution models, multiple problems have prevented widespread application of this technique in practice. First, FWI is computationally intensive, in part ...
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Waveform inverse problems are mathematically ill-posed and, therefore, regularization methods are required to obtain stable and unique solutions. The Total Variation (TV) regularization method is used to resolve sharp interfaces obtaining solutions where edges and discontinuities are preserved. TV regularization accomplishes these goals by imposing sparsity on the gradient of the model paramete...
متن کاملFull waveform inversion with dynamic image warping
Full waveform inversion (FWI) can generate high-resolution subsurface models, but often suffers from an objective function with local minima caused mainly by an absence of low frequencies in seismograms. These local minima cause cycle skipping when the initial model for FWI is far from the true model. To avoid cycle skipping, traveltime inversion is often used to compute initial models for FWI....
متن کاملFull waveform inversion with optimal basis functions.
Based on the approach suggested by Tarantola, and Gauthier et al., we show that the alternate use of the step (linear) function basis and the block function (quasi-delta function) basis can give accurate full waveform inversion results for the layered acoustic systems, starting from a uniform background. Our method is robust against additive white noise (up to 20% of the signal) and can resolve...
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ژورنال
عنوان ژورنال: GEOPHYSICS
سال: 2014
ISSN: 0016-8033,1942-2156
DOI: 10.1190/geo2013-0291.1