Abstract:The travel paths in surface layers are usually assumed to be nearly vertical in calculating field statics, Each receiver point has one ttunique"value for correction, However, this is not valid in mountaneous areas of large relief.In that case, it seems necessary to t}push" both source and receiver points along their respective raypaths onto their datum plane. The attitude of araypath is determined by offset distance, depth and dip of reflector, elevation difference from the datum to source or receiver, and velocity functions within the surface layer.This procedure for obtaining a more exact correction value is given a name continuation field statics. The NMO correction arranged after such statics is called "continuation dynamic correction". Taking both together, we can call it "continuation correction". Using a program of dip-velocity scan designed on the above principle, both dip and RMS velocity for the neighbourhood or a CMP can be obtained, These can be in torn used !in continuation correction and in estimating velocity variati,ns along the section. The program of continuation correction has been applied to the processing of several lines shot in eastern arid southern parts of Sichuan with rough terrain and tight folding, and has yielded good results.
引用本文:
邓富求, 李远宏, 欧泽芬. 延拓校正法[J]. 石油地球物理勘探, 1984, 19(3): 224-238.
Deng Fuqiu. Continuation method for near surface corrections. OGP, 1984, 19(3): 224-238.