Iterative inversion for velocity using waveform data
نویسندگان
چکیده
منابع مشابه
Migration Velocity Analysis and Waveform Inversion
Waveform (output least squares) inversion of seismic reflection data can reconstruct remarkably detailed models of subsurface structure, and take into account essentially any physics of seismic wave propagation that can be modeled. However the waveform inversion objective has many spurious local minima, hence convergence of descent methods (mandatory because of problem size) to useful Earth mod...
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Full waveform inversion (FWI) is an effective and efficient data-fitting technique that has been widely used to produce accurate estimation of model parameters in Geophysics. The efficiency and accuracy of FWI are determined by the three main components: numerical solution for forward problem, gradient calculation and model update which usually involves the optimization method. The success of t...
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If we assume that the velocity proole is an image that can be compressed greatly using wavelets, then a relatively smaller wavelet represented model can be equivalent to a larger physical model; we obtain the modiied Bleistein/Cohen (BC) inversion formulation by restricting the perturbation to the smaller wavelet represented model. The method demonstrates three important features: rst, the BC t...
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The gradient of standard full-waveform inversion (FWI) attempts to map the residuals in the data to perturbations in the model. Such perturbations may include smooth background updates from the transmission components and high wavenumber updates from the reflection components. However, if we fix the reflection components using imaging, the gradient of what is referred to as reflected-waveform i...
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Seismologists have long used extended sources, both physical and synthetic, to enhance the effectiveness of data acquisition and processing in various ways. Recently, extended synthetic sources have been suggested as a means to to substantially reduce the computational complexity of waveform inversion. Most proposed synthetic sources for waveform inversion are random in some way. In contrast, I...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1986
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1986.tb01968.x