纵横波联合反演方法研究及应用

Compressional and shear wave joint inversion technique research and its application

本文利用Aki-Richards提出的近似公式,对PP波和PS转换波的联合反演方法进行了研究。利用PS波反射系数公式消去PP波反射系数公式中的密度项,并给出一种利用奇异值分解来求解的反演方法。与单独利用PP波的反演方法相比,采用两组独立的PP波和PS波数据的联合反演方程组更加稳定。理论试算和实际资料的应用表明,此种纵横波联合反演方法的准确性和抗噪性比单独的PP波反演方法有明显的提高。

By using approximate formula by Aki-Richards,the research of PP-PS joint inversion technique was conducted in this paper.The PS wave reflection coefficient formula was used to eliminate the density term in the PP wave reflection coefficient formula,and an inversion technique which uses singular value decomposition solution was presented in this paper.Compared with the PP wave inversion method,the PP-PS method which uses two joint inversion equations is more stable.The theoretical trial calculation and application of the field data indicate that the accuracy and noise-resistance of the PP-PS technique are much higher and much more robust than the PP inversion technique.