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Velocity analysis based on data correlationNormal access

Authors: T. van Leeuwen and W.A. Mulder
Journal name: Geophysical Prospecting
Issue: Vol 56, No 6, November 2008 pp. 791 - 803
DOI: 10.1111/j.1365-2478.2008.00704.x
Organisations: Wiley
Special topic: Towards a Full Waveform Inversion
Language: English
Info: Article, PDF ( 556.44Kb )

Summary:
Several methods exist to automatically obtain a velocity model from seismic data via optimization. Migration velocity analysis relies on an imaging condition and seeks the velocity model that optimally focuses the migrated image. This approach has been proven to be very successful. However, most migration methods use simplified physics to make them computationally feasible and herein lies the restriction of migration velocity analysis. Waveform inversion methods use the full wave equation to model the observed data and more complicated physics can be incorporated. Unfortunately, due to the band-limited nature of the data, the resulting inverse problem is highly nonlinear. Simply fitting the data in a least-squares sense by using a gradient-based optimization method is sometimes problematic. In this paper, we propose a novel method that measures the amount of focusing in the data domain rather than the image domain. As a first test of the method, we include some examples for 1D velocity models and the convolutional model.


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