Enhanced refractor imaging by supervirtual interferometry

摘要

We introduced a new refraction interfer-ometry method that can be used to extend the aperture of refraction surveys by generating supervirtual traces with significantly higher SNR than the recorded traces. For well-sampled refraction surveys this means that refraction arrivals can now be picked over a greatly expanded aperture, thus improving the constraints on the subsurface velocity model in subsequent tomography. In the ideal case, the enhanced refractions can also be picked where they are not the first arrivals, and so allow the possibility of later-arrival refraction tomography.