Everything depends on V(x,y,z)

Jon Claerbout

jon@sep.stanford.edu

ABSTRACT

Estimating 3-D velocity V(x,y,z) is the most important problem in exploration geophysics. It is a very difficult problem. In order to really solve it, SEP has turned to fundamentals of estimation theory with topographic data, regridding, interpolation, truncation, erratic noise, instrument drift, etc. This return to fundamentals has proven rewarding, leading us to the helix discovery. This discovery is revitalizing wave equation migration in 3-D, preconditioning many estimations (big speed up), and regularizing velocity estimation (blends measured and prior information). To enable young people to become productive with 3-D seismic data, Biondo Biondi and Bob Clapp have built a 3-D seismic software infrastructure that is able to address real 3-D problems, such as V(x,y,z) and aliasing in 3-D. This infrastructure is unique in the academic world. None of the other academic organizations have enough computing power and infrastructure to allow routine research activities with 3-D field data.