利用地震资料约束反演预测地层压力

Formation pressure prediction using restrained inversion of seismic data

以往利用地震资料预测地层压力时所用的速度参数由速度谱拾取，密度参数由经验公式计算获取。这样求取的密度参数不能反映地层岩性的横向变化。尤其是此法只限于单井预测，因此，预测的地层压力精度受到限制。本文利用地震资料反演方法，通过给定的初始地层岩性模型，将测井数据作为反演约束条件，求取地层物性参数，然后作出预测地层压力剖面。应用实例表明，用该方法预测的地层压力精度较高，而且沿横向可以对比、追踪地层压力的变化情况。

In general formation pressure prediction using seismic data,the needed velocity data are taken from velocity spectrum,and the density data are derived from empiric formula- Such density data fail to incarnate lateral lithology variation. Especially this method only applies to single borehole prediction,so the predicted formation pres-sure is not accurate enough.My forrnation pressure prediction by seismic inversion needs an initial lithology model and uses logging data as inversion constraint to evaluate formation physical-data,which are then used to draw predicted formation pressure section.Real examples show that this new method gives accurate formation pressure prediction,showing lateral pressure variation.