Pre-stacking dispersion attribute extraction method

The invention relates to an oil gas seismic prospecting field and particularly relates to a pre-stacking dispersion attribute extraction method. The pre-stacking dispersion attribute extraction method performs development on a conventional AVO analysis technology to obtain a changing pattern of characteristics (amplitude, dispersion and attenuation) which are reflected by earthquake of different frequencies along an offset through excavation, obtaining an earthquake dispersion abnormal condition related to oil gas saturability through detection, provides more sensitive attribute parameters to reservoir description and fluid prediction so as to reduce multiplicity of an oil gas prediction problem. The pre-stacking dispersion attribute extraction method comprises steps of performing partitioning pre-processing on pre-stacking earthquake data to obtain subarea angle trace gather, extracting to obtain a time-frequency spectrum of the subarea angle trace gather, calculating to obtain a reflection coefficient spectrum of the subarea angle trace gather and reflection coefficients corresponding to different frequency bands, and calculating a pre-stacking dispersion attribute.