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