ACOUSTIC IMPEDANCE INVERSION USING IMPROVED CONJUGATE GRADIENT ALGORITHM

A fast and effective algorithm of acoustic impedance inversion is always our goal in seismic inversion.Inversion equation is established from the objective function.A new conjugate gradient algorithm has been put forward to improve impedance inversion,which is based on classical conjugate gradient algorithm and made improvements in conjugate gradient direction,adapted automatically in damping and relaxation constant.In addition,whole recursion is finished by vector operation,which greatly saved computer's RAM.The inversion result of synthesizing traces and measured seismic section shows that the new method has the characteristic of higher precision,rapider speed and stronger stability.