用时深效应指数预测储层孔隙度——以辽河坳陷西部凹陷南段沙三中亚段为例

基于Sombra和Kiang提出的用时深效应指数TDI预测储层孔隙度的方法,在层序地层研究和沉积相分析的基础上,建立了不同沉积微相储层TDI与实测孔隙度的相关模型,并利用三维地震资料计算出待评价区不同沉积微相储层的TDI值,对辽河坳陷西部凹陷南段沙三中亚段储层孔隙度进行了预测。与研究区已钻井实测孔隙度对比结果表明,在钻井资料较少的情况下,利用本文方法可以对填隙物含量大于10%一定范围储层的孔隙度进行预测。探讨了超压情况下TDI的计算,以期使利用TDI预测储层孔隙度的适用范围更广。

Predicting reservoir porosity by Time-Depth Index:a case study on Es3m in the southern Xibu sag, Liaohe depression

Based on the reservoir porosity prediction method by Time-Depth Index(TDI) introduced by Sombra and Kiang,a sequence stratigraphy study and a sedimentary facies analysis,a correlation model between TDI and measured porosity has been built for various microfacies of the middle Third Member of Shahejie Formation(Es3m) in the southern Xibu sag,Liaohe depression.The TDIs of various microfacies are calculated by seismic data.This approach has resulted in prediction of reservoir porosity for Es3m.By comparison with the measured downhole porosity data,it is suggested that this approach can be used to predict porosity for reservoir with pore-filled cements great than 10% in an area with sparse drilling data.In addition,the TDI calculation for overpressured reservoir is discussed in order to extend the application of this approach.