随机地震反演技术及在文昌13-1油田的应用

Seismic stochastic inversion and its application in Wenchang 13-1 oilfield.

随机地震反演技术是一种将随机模拟理论与地震反演相结合的反演方法,该方法可以有效地提高地震资料的垂向分辨率,并充分考虑地下地质的随机特性,使反演结果更符合实际地质情况。本文在做随机地震反演时,以确定性地震反演的结果作为软数据,以测井资料作为硬数据,使用同位协同克里金序贯高斯模拟技术反演储层物性变化。文昌13-1油田的实例研究表明,这种随机地震反演比起基于模型的确定性地震反演方法来说,其垂向分辨率更高,使得在油藏地质建模中可以充分使用地震资料,容易取得良好的效果。

Seismic stochastic inversion technique is a such inversion method that combines the stochastic simulation theory with seismic inversion,which can effectively improve the vertical resolution of seismic data and fully consider the random characters of subsurface geology that made the inversion results more consistent with practical geological scenario. Taking the results of determinative seismic inversion as soft data and logging data as hard data , the paper uses collocated Cokriging sequential Gauss simulation technique to do inversion of physical changes of reservoir. The studied results of the case in Wenchang 13-1 oilfield showed that the seismic stochastic inversion has higher vertical resolution in comparison with the determinative seismic inversion based on model, it can fully use seismic data in geologic model-building process of reservoir and easily gain good results.