


 Subsalt imaging by targetoriented wavefield leastsquares migration: A 3D fielddata example  

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Subsalt imaging by targetoriented wavefield leastsquares migration: A 3D fielddata example
Yaxun Tang and Biondo Biondi
Abstract:
We pose the reflectivityimaging problem as a linear inversion problem
and solve it in the image domain in a targetoriented fashion.
The most computationally intensive part of the imagedomain inversion
is the explicit computation of the Hessian matrix.
We show how we can overcome the cost issue by using the phaseencoding technique
in the 3D conicalwave domain.
We apply the inversionbased imaging methodology to a 3D
field data set acquired from the Gulf of Mexico (GOM), and we precondition
the inversion with nonstationary dip filters, which naturally incorporate
interpreted geological information. Numerical examples
demonstrate that imaging by regularized inversion successfully recovers the reflectivities
from the effects of uneven illumination, yielding images with more balanced amplitudes
and higher spatial resolution.
20110524