Click on the thumbnail on the left to view the results of a computationally efficient migration code applied to the latest BP TTI synthetic.

A technique is proposed for generating optimised curves describing the dependence of the pressure wave velocity on propagation angle. Click on the thumbnail on the left to view sample results - our generated curve is blue, the exact Tsankin's curve (nearly covered by the blue curve) is light red, Bill Harlan's analytic formula is in magenta and the weak anisotropy approximation in green. The result can be used for highly efficient kinematically-accurate artifact-free wave propagation modelling in tilted transversally isotropic media.

Click on the thumbnail to view sample IR of the 3-dimensional 7x7 explicit extrapolation operator for a tilted transversally isotropic medium, comparing the results of a phaseshift extrapolator with those of the finite difference extrapolator in an animation.

Click on the thumbnail to view the spectrum of a computationally efficient narrow-aperture (7x7 pts) 3-dimensional explicit extrapolation operator (and the corresponding phaseshift) for a tilted transversally isotropic medium with Thomsen parameters eps=.45, delta=.2 and tilted symmetry axis defined by angles psi=30deg (rotation in the x,y plane) and phi=60deg (angle from vertical), suitable for max dip of up to 60deg.

Click on the thumbnail to view the results of IR migration using one-way "acoustic" wave equation approximation in a 3D tilted transversally isotropic medium with Thomsen parameters eps=.45, delta=.2 and tilted symmetry axis defined by angles psi=40deg (rotation in the x,y plane) and phi=30deg (angle from vertical). The proposed technique is capable of computationally efficient one-way seismic wave extrapolation free form shear wave artifacts, in arbitrary variable TTI media (see the 04 March 09 article below).