THREE-DIMENSIONAL TRAVELTIME AND AMPLITUDE COMPUTATION USING THE SUPPRESSED WAVE EQUATION ESTIMATION OF TRAVELTIME (SWEET) ALGORITHM

摘要

By using the property of the damped wavefield in the Laplace domain, we calculate the traveitime and the amplitude of first arrival events in three dimensions, useful for 3D conventional and turning wave Kirchhoff migration. To calculate the wavefield and the derivative wavefield we factor the real impedance matrix and obtain the wavefield and its derivative using modern sparse matrix technology. 3D impedance matrices arising from our 3D Suppressed Wave Equation Estimation of Traveitime (SWEET) algorithm are so huge such that cannot be solved using conventional in-core matrix solvers. We minimize the required memory by combining a weighted-average finite element technique for reducing the number of grid points per wavelength with an out-of-core multifrontal algorithm. We demonstrate the applicability of our algorithm by showing the traveitime and the amplitude results for the 3D SEG/EAGE salt model.