METHOD FOR PRECISELY INVERTING YOUNG'S MODULUS AND POISSON'S RATIO

摘要

A method for precisely inverting Young's modulus and Poisson's ratio, comprising the steps: performing conventional pre-processing on original prestack seismic data, and stacking, at different angles, the pre-processed prestack seismic data; performing standardized processing on original log data to obtain inversion parameters of Young's modulus and Poisson's ratio, and performing lowpass filtering on the calculation result, so as to construct an initial inversion model; obtaining a difference value between a reflection coefficient of the pre-processed prestack seismic data and a reflection coefficient obtained by means of calculation according to a Young's modulus Zeoppritz equation, so as to construct a right-side constant term of an inversion equation set; obtaining a first-order Taylor expansion of each item of the Young's modulus Zeoppritz equation, and solving each Taylor expansion according to the initial inversion model, so as to construct a left-side constant term of the inversion equation set; obtaining a disturbance quantity of three-parameter inversion by solving the inversion equation set, and adding same to the initial model to obtain a new inversion resu and converting the inversion result into a reflection coefficient and then performing low frequency compensation by means of an initial low frequency mode, so as to obtain a final inversion result.