Keywords: 
• seismic sedimentology /
• the time-crossing attribute of seismic event /
• 90° /
• phasing of seismic data /
• strata slicing

Abstract: Seismic sedimentology is the use of seismic information to study sedimentary rocks and their forming processes. It is a new marginal interdisciplinary subject following seismic stratigraphy and sequence stratigraphy. It differs from seismic stratigraphy, sequence stratigraphy and sedimentology in its research contents, methods and technologies. The new knowledge of “seismic events go across time surfaces” is the most important innovation of this subject. But it is only a supplement not a substitution of sedimentology. It should base on the geology research and under the principle of sedimentology. The technologies of 90°-phase inversion, stratal slicing and interpreting with frequency are the three key technologies. The method of 90°-phase inversion gives stratigraphic meaning to seismic phase, and is used to interpret high frequency sequences; the technology of stratal slicing is a series of slices along the surfaces inserted proportionally between two time-surfaces and this technology is used to study the planar distribution of depositional systems. Based on the fact that seismic data with different main frequency reflect different geological information, the interpretation result will be more reasonable in geological meaning by the technology of interpreting with frequency decomposing.