Frequency-variable solid-liquid decoupling viscoelastic fluid factor pre-stack seismic inversion method

The invention relates to the field of exploration geophysical seismic fluid identification, in particular to a frequency change solid-liquid decoupling viscoelastic fluid factor pre-stack seismic inversion method. The method comprises the following steps: step 1, carrying out equal-interval frequency division processing on seismic data; step 2, frequency-division elastic impedance inversion is carried out by using the frequency-division seismic data in the step 1; step 3, constructing a frequency change solid-liquid decoupling fluid factor inversion equation; 4, aiming at each pre-stack angle stack, carrying out frequency change solid-liquid decoupling fluid factor inversion equation coefficient inversion on the sampling points; and 5, carrying out frequency change solid-liquid decoupling fluid factor inversion. According to the method, on the basis of conventional solid-liquid decoupling fluid factor inversion, a reference frequency and crossover frequency calculation process is established, and the fluid fa