The invention discloses a
longitudinal wave and converted wave
prestack joint inversion method and
system. The method comprises the steps that a
longitudinal wave angle gather and a converted
wave angle gather are input; longitudinal wavelets and converted wavelets at all angles are extracted; an initial elasticity parameter model of a
longitudinal wave time domain is established; a longitudinal wave synthesis
record error of the longitudinal wave
time domain is calculated; a time-displacement operator matrix and an error back-propagation operator matrix are calculated; a converted wave synthesis
record error of a converted wave
time domain is calculated; a
total error of longitudinal
waves and converted
waves in the longitudinal wave time domain is calculated; if the
total error is smaller than or equal to a set error threshold value, an elasticity parameter inversion result is output; and if the
total error is greater than the set error threshold value, a logarithmic elasticity parameter model of the longitudinal wave time domain is updated. Through the method and
system, longitudinal wave and converted wave
prestack joint inversion in which longitudinal
waves and transverse waves are precisely and automatically matched is realized, the precise and stable elasticity parameter inversion result is acquired, and reservoir prediction precision is improved.