Interlayer seismic wave dispersion attribute calculation method based on frequency-dependent elastic impedance inversion

Abstract

The present application relates to a kind of interlayer seismic wave dispersion attribute calculation method based on frequency variable elastic impedance inversion, including the partial stack of prestack angle gather, obtains partial stack angle gather;By deconvolution and spectral decomposition to partial stack angle gather, get wavelet balanced frequency division seismic data;90° phase conversion is applied to wavelet balanced frequency division seismic data, and its result is used as the relative elastic impedance under different frequency;Relative frequency variable elastic impedance is corrected using the elastic impedance obtained by elastic inversion, and approximate frequency variable elastic impedance is obtained;Elastic impedance equation is extended to frequency domain, and frequency variable elastic impedance inversion is established, with approximate frequency variable elastic impedance as the input of inversion, to estimate frequency variable bulk modulus and shear modulus;According to the inversion result, the interlayer seismic wave dispersion attribute related to bulk modulus and shear modulus is calculated, for high-precision unconventional dense reservoir fluid identification, the present application improves the accuracy and reliability of reservoir fluid identification.

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