Migration velocity analysis and waveform inversion
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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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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Residual and cascaded migration can be described as a continuous process of velocity continuation in the post-migration domain. This process moves reflection events on the migrated seismic sections according to changes in the migration velocity. Understanding the laws of velocity continuation is crucially important for a successful application of migration velocity analysis. In this paper, I de...
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pore pressure could be estimated prior to drilling using seismic velocities. applying this approach, the final calculated pore pressure is highly affected by accuracy of the obtained velocity data. in order to generate an accurate velocity cube with proper resolution, velocities from well logs and post-stack 3-d seismic inversion are used along with stacking velocities from velocity analysis of...
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The extended model concept links migration velocity analysis and waveform inversion. This abstract presents a method to solve a partially linearized version of the full waveform inversion problem with model extension. Linearization separates the model of the earth into the smooth long scale background model and the short scale model. Extended waveform inversion allows the short scale model to d...
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ژورنال
عنوان ژورنال: Geophysical Prospecting
سال: 2008
ISSN: 0016-8025,1365-2478
DOI: 10.1111/j.1365-2478.2008.00698.x