zero-offset
4.In the paper, according to the theory that the resolution of each seismic trace in common midpoint (CMP) gather can be reduced along with the increase in offset, the cause of forming dynamic correction stretching is explained and the stretching factor of the non-zero offset trace relative to the zero offset trace is derived in light of the generalized resolution formula.
6.Common Reflection Surface(CRS) stack,a new stacking technique compared with conventional common midpoint(CMP) stack,is a zero-offset profile imaging method independent of macro-model.
7.Based on analyzing AVO characters of seismic CMP gather and stratigraphic absorption passing different path by different offset signal,the paper discovered that for different frequency component of seismic signal at different offset signal at a certain moment,the relation between frequency and offset x can be described by polynomial and then the technique of fitting a zero offset seismic trace in time frequency domain based on time frequency analysis and fitting of polynomials has been proposed.
9.To perform CRS stack depends on the determination of three wave attributes,compared with conventional common middle point(CMP) stack and dip move out(DMO) stack,CRS stack can focus more energy in the vicinity of the reflector,therefore can obtain a better zero offset section by stacking events with same phase.
