The approach of 90°phase shift has been espoused as one of the core techniques in seismic-based sedimentology since 1998,when systematic researches were launched on the theories and application techniques of seismic-based sedimentology.How-ever,its practical implementation is unsatisfactory.According to the philosophy of seismic prospecting,seismic events represent stratigraphic interfaces with impedance contrasts.The practice of 90° phase shift is intended to transform interfacial events into rock formations.Subsurface complexities often show as frequently interbedded thin layers,the interfaces of which could not be one-to-one correlated with seismic reflections as per forward modeling.This means that a reflection is the combination of seismic re-sponses from a certain number of thin layers.Due to the limitation of seismic resolution,the operation of 90° phase shift cannot convert seismic data from interfacial events into lithologic sections;besides,such an operation is geologically meaningless and can-not yield good results for structure and lithology interpretation.Consequently,it may not be treated as a key technique in the study of seismic-based sedimentology,as it neither improves resolving power of seismic data nor yields lithologic sections from seismic sections.
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