基于支持向量机的叠前地震反演方法

Prestack seismic inversion method based on support vector machine

为了克服常规叠后地震反演方法中存在的缺陷,在保证反演效果的前提下提出了一种基于支持向量机的叠前地震反演方法。利用该方法可以得到比常规叠后波阻抗反演更丰富的储层物性参数,不但适合储集层物性反演,还可进行含油气性反演;可以直接从地震数据中提取地层的弹性参数,不需要对Zoeppritz方程进行简化以及对弹性参数做任何假设,也不需要初始地质模型和测井曲线的约束。反演结果表明,该方法具有反演速度快、稳定性好及抗噪能力强的特点,且易于进一步推广应用。

By analyzing the conventional seismic inversion methods and overcoming their defects, a prestack seismic inversion method based on support vector machine was proposed ensuring the inversion effect. The method can extract much more reser- voir physical properties than conventional poststack acoustic impedance inversion, so it is suitable for reservoir physical property and oil and gas property inversion. And it can directly estimate independent elastic parameters using seismic data. This method eliminates the need for any approximations of the Zoeppritz＇s equations or assumptions about the independent elastic parameters, initial model and constraint of well logging. The inversion results show that the proposed method is characterized by high inversion velocity, good stability and great antinoise ability. It is suitable for further popularization and application.