两种薄层弹性参数多波联合反演的对比

Analysis of two typical thin bed elastic parameter prediction using multi-wave joint inversion

针对薄层及多波联合反演两大研究热点,以薄层频率域反、透射系数为基础,建立了两类薄煤层模型——强阻抗和低阻抗差异薄层,并对其分别进行单纯P波、S波及PP波与PS波联合反演。利用反演结果及误差分析,对比了单种波反演和联合反演的效果,从模型反演数据证实了对于薄层而言,PP波和PS波联合反演比P波或者S波单纯反演具有更好的效果。

Thin bed and multi-wave joint inversion are two major research focuses in fossil energy exploration. In the paper, two types of thin-bed coal models including strong impedance difference （model I ） and weak impedance difference （model II） have been built. These researches were based on reflection and transmission coefficient of thin layer in frequency domain. Then elastic parameters of the models could be respectively predicted by using P-wave, S-wave inversion and PP＆PS joint inversion. Model error analysis and inversion result were used to evaluate the effect of inversion methods, have theoretically confirmed that joint inversion of PP＆PS is better for thin bed model than single inversion of P-wave or S-wave.