Global coherency inversion, which consists of maximizing a semblance function calculated from prestack seismic data, has been proposed for estimating the velocity-depth model with no necessity for prestack or poststack travel time picking. At each iteration of inversion, multi-offset travel time calculation is performed and the semblance value is computed on prestack gathers along these time curves. Layer velocities and zero-offset times for principle reflectors are chosen as inversion parameters. In this work, coherency optimization is based on a new Regularized Global Approximation method (unlike simulated annealing or genetic algorithms, it includes a predictor-corrector procedure with significantly reduces the number of evaluations of the objective function.
|Number of pages||3|
|State||Published - 1995|
|Event||1995 Society of Exploration Geophysicists Annual Meeting, SEG 1995 - Houston, United States|
Duration: 8 Oct 1995 → 13 Oct 1995
|Conference||1995 Society of Exploration Geophysicists Annual Meeting, SEG 1995|
|Period||8/10/95 → 13/10/95|