叠前地震资料AVA变参数反演方法

AVA inversion using replacing parameters method for pre-stack seismic data

线性AVA反演将纵横波速度比作为常数,从而把非线性AVA反演问题线性化,以得到稳定的反演结果.为突破这一假设条件对AVA反演的限制,本文把纵横波速度比作为未知量,通过变换反演参数,将非线性AVA反演问题线性化,再利用广义线性反演方法求解,得到合理稳定的储层参数.利用实际工区井数据考察了方法的可行性和抗噪性.最后,将该方法应用到实际地震数据,得到了合理的反演结果,说明本反演方法的可靠性与适用性.

Linear AVA inversion method takes the ratio of Swave velocity to P-wave velocity as a constant to linearize the nonlinear AVA problem through to obtain a stable inversion result.In order to break the limits caused by this assumption in AVA inversion applications,we regard the velocity ratio as an unknown quantity,and linearize the nonlinear AVA inverse problem through replacing the inversion parameters.Then,we use the generalized linear inversion method to solve the inverse problem and obtain a reasonable and stable reservoir parameter.We investigate the feasibility and noise immunity using the well data from actual survey.Finally,the method is applied to real seismic data and the inversion results are reasonable.