一种基于等效介质理论的储层流体识别技术

A reservoir fluid identification technology based on equivalent medium theories

基于简单岩石弹性参数的流体性质识别受岩性、孔隙结构的影响,对复杂岩性储层识别结果存在较大不确定性。从岩性、孔隙结构、流体性质等3个方面入手,在微分等效介质理论基础上提出变骨架参数值计算方法,并将计算结果引入到多重孔隙介质模型中,求解多重孔隙条件下模型的数值解,得到干岩石体积模量,进而计算流体模量因子,最后通过流体模量与流体模量因子交会分析精确识别储层流体性质。渤海油田的应用效果表明,本文方法在一定程度上校正了岩性、孔隙结构对岩石属性的影响,使得岩石弹性参数仅反映流体性质特征,储层流体性质识别符合率显著提高,具有较好的应用推广价值。

In view of the simple rock elastic parameters,the fluid identification is affected by lithology and pore structure,which leads to uncertainty of identification results.From three aspects of lithology,pore structure and fluid properties,one method is proposed to calculate variable matrix parameters based on differential equivalent medium theory,and then the results are used in multi pore medium model,which calculates the numerical solution of the model under multiple pore conditions to get bulk modulus of dry rock;then calculate fluid modulus factor,and finally the fluid properties are identified accurately through intersection analysis of fluid modulus and fluid modulus factors.The application results of Bohai oilfield shows that this method can correct the influence of lithology and pore structure on rock properties to some extent,and make the elastic parameters of rock to only reflect the characteristics of the fluid.Accordingly,the coincidence rate of reservoir fluid identification is significantly improved,and has a good application and promotion value,enjoying agood application potential.