深度域地震反演方法探索

Probing for seismic inversion in depth domain

由于时间域地震反演自身的局限性,经常无法满足储层精细描述的需要。本文讨论了利用合理的空变速度场将时间域地震数据进行深时转换到深度域,然后利用地震多属性变换方法进行深度域地震反演。该方法不是基于褶积模型,巧妙地避开了深度域子波难以提取的问题,同时克服了测井曲线时深转换过程中由于重采样造成的高频信息丢失。应用结果表明,深度域地震反演方法提高了地震反演的分辨率,保证了反演结果能够与构造图、深度域的测井和地质资料直接进行对比研究,为综合利用地震、测井解决实际地质问题提供了新的途径。

Due to its own limitation,in many cases the seismic inversion in the time domain can not meet the requirement of the fine reservoir characterization.Conversion of the seismic data in time domain to depth domain by using reasonable spatially variable velocity field was discussed in this paper,and then by utilizing seismic multi-attribute transform method the seismic inversion in the depth domain was conducted.The new method is not based on deconvolution model,it delicatedly avoided the dilemma in which the depth wavelet is difficult to estimated,meanwhile it overcame the loss of the high frequency due to the resampling during the time to depth conversion.The application results show that the depth domain seismic inversion method raised the resolution of the seismic data,insured the direct correlation and analysis between inversion results and the contour map,and /or the well logging and/or geological data in the depth domain,it provided a new way to integratedly apply seismic data and well logging data in solving the geological problems.