【摘要】 针对涠西南地区复杂的地质条件,以及基于地震资料预测储层需要纵、横波阻抗及速度、密度等弹性参数,对涠西南地区开展了地震数据叠前同步反演.该反演方法使用改进的Fatti方程,可以同时获得各种弹性参数,应用预白化处理来控制反演的噪音水平,使反演结果更稳定.使用不同子波来均衡不同角度部分叠加数据体之间振幅、频率和相位差异,使反演结果更准确.实际地震资料处理结果表明,随着角度增大,子波主频减小.精度验证结果表明,叠前同步反演精度达到了要求,其中纵波阻抗和横波阻抗反演结果精度都比较高,密度反演结果精度相对较差.更多还原

【Abstract】 Based on the complex geological conditions of the Weixi’nan area,pre-stack simultaneous inversion of seismic data in the Weixi’nan area was conducted,in order to obtain the elastic parameters including the impedances of both P-and S-waves,velocity,and density for the reservoir forecast.The improved Fatti equation was utilized to obtain the elastic parameters,and the noise of inversion was controlled through pre-whitening processing to make the inversion results stable.Various wavelets were used to balance the differences in amplitude,frequency,and phase between multi-angle stacked seismic data,in order to ensure the accuracy of the inversion results.The result of processing of field seismic data show that the peak frequency of the wavelet decreased with the increase of the angle.The accuracy verification indicates that the accuracy requirement of the pre-stack simultaneous inversion was satisfied.The accuracies of the inversion results for the impedances of P-and S-waves were high,while the accuracy of the density result was relatively low.更多还原