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Generalized migration

Anisotropic ADCIGs are based on the generalization of integral migration to the computation of a prestack image that includes the subsurface-offset dimension ($h_{\xi}$) in addition to the usual image depth ($z_{\xi}$) and midpoint ($m_{\xi}$). Figure [*] illustrates the subsurface-offset dimension: the image point $\left(m_{\xi},h_{\xi},z_{\xi}\right)$ belongs to the migration response of an impulse recorded at midpoint mD, surface offset hD and travel time tD, provided that the travel time along the source and receiver paths (of length Ls and Lr, respectively) is equal to tD.

 
imp-resp
Figure 1
Illustration of generalized migration, where the prestack image is a function of the subsurface offset and $\gamma$ and $\alpha_x$ are the group aperture and dip angles, respectively.

imp-resp
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next up previous print clean
Next: Computation of ADCIGs Up: Residual moveout in anisotropic Previous: Residual moveout in anisotropic
Stanford Exploration Project
5/6/2007