2D TOMOGRAPHY FOR VSP
, by J. L. Guiziou, Y. Dezard and G. Martayan
Tomography for VSP recovers a layered image of the earth from the traveltimes of borehole seismic surveys. Coupling an analytical two-point ray-tracing algorithm with continuation methods leads to fast and accurate computation of traveltimes. The parametrization of the model by B-splines enables the use of a fast and stable inversion process, using a nonlinear inverse theory. Test cases demonstrate the reliability of the method.