Real data waveform inversion in crossholeseismic tomography

摘要

Conventional crosshole tomography uses travel times and ray tracing to produce quantitative but low-resolutionrnvelocity images of the subsurface. In contrast, full-wavefield tomographic techniques seekrnto determine a highly-resolved, quantitative model of the subsurface that is able to explain the entirernseismic wavefield including those phases that conventional processing and migration seek to remove.rnSuch methods have the potential to image the subsurface with significantly improved spatialrnresolution, to provide fully quantitative images of physical properties in the subsurface, especiallyrntime-lapse, high-resolution imaging of the reservoir. We seek to provide a computationally tractablernsolution to this problem, using existing computer hardware, that will allow practical full-wavefieldrnimaging of a crosshole seismic dataset which has typically thousands shots and each has hundredsrnreceivers.