Intersection determination method of sensitive reference frequency in AVO frequency dispersion parameter inversion depending on frequency

An intersection determination method of a sensitive reference frequency in AVO frequency dispersion parameter inversion depending on a frequency is an oil-gas seismic exploration data processing and interpretation technology. Intersection analysis is used to directly guide a selection method of a sensitive reference frequency in the AVO frequency dispersion parameter inversion depending on the frequency. Firstly, in a seismic effective frequency band scope, all frequencies are used to carry out vertical and horizontal wave frequency dispersion property parameter inversion on pre-stack angle gathering; then known logging interpretation data is fully used to carry out constraint and a vertical and horizontal wave frequency dispersion property of all the frequencies containing a fluid reservoir section is projected to a frequency-frequency dispersion property intersection plane graph; finally through intersection analysis, a frequency corresponding to a vertical and horizontal wave frequency dispersion property parameter maximum value containing a fluid reservoir and a frequency or a frequency range corresponding to a condition when a vertical and horizontal wave frequency dispersion property difference of different fluid reservoirs is maximum are determined. The above frequency and the above frequency or the above frequency range are a sensitive characteristic frequency. The frequency is taken as a sensitive optimal reference frequency so as to carry out the AVO vertical and horizontal wave frequency dispersion property parameter inversion depending on the frequency on the pre-stack angle gathering. Therefore, seismic frequency dispersion abnormity containing the fluid reservoir can be protruded maximumly and the frequency dispersion difference of the different fluid reservoirs can reach a maximum value so that distinguish and identification of different fluids are realized.