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Next: Acknowledgments Up: Decker and Zhang: DTW Previous: Discussion

Conclusions

We propose a workflow that uses dynamic warping to efficiently correct for residual elliptical HTI moveout present in image gathers. The method works by calculating and applying the shifts that match each trace within an image gather to that gather's stack. Stacking flattened gathers results in seismic images with more coherent and focused events. Fitting the shift dependence on azimuth to an ellipse provides both the azimuth of the fast anisotropic axis, which may coincide with the orientation of the primary fracture network, and a measure of the intensity of the anisotropy. These attributes may be used to aid in characterization of the subsurface. The method is embarrassingly gather-parallel, enabling it to be implemented relatively easily on large data sets, with much less computational expense than would be associated with a processing workflow that takes the variation of seismic velocity with azimuth into account.




2021-10-25