A new method for crosswell reflector imaging
Imaging seismic reflectors with crosshole and VSP tomographic data is only occasionally carried out using Kirchhoff-style migration schemes. We introduce a new kinematic method here for tomographically imaging reflectors. The scheme first picks up traveltimes of each reflected event from common-shot gather tomographic data. It then uses the picked times to image the reflector interfaces with a very important principle: that two reflection points from the same interface that produce reflection pulses on two neighbouring receivers have the same tangent line. The same scheme can be used for surface or crosshole reflection data, but the latter requires some special processing to separate upgoing and downgoing waves...
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