特低渗油藏油水相渗端点预测模型与数值模拟——以濮城沙三中6—10油藏为例

rediction model of oil-water relative permeability endpoint in extra-low permeability reservoir and numerical simulation: taking the 6-10 reservoir of middle Es3 in Pucheng as an example

唐磊

TANG Lei

中国石化油田事业部，北京 100728

Oilfield Department, SINOPEC, Beijing 100728, China

濮城沙三中6—10油藏储层最大进汞饱和度和退汞饱和度变化范围大，这反映了油藏相渗端点非均质性较强。在相渗实验较少的条件下，利用压汞曲线实验，基于统计分析方法，分别建立了束缚水饱和度￣孔隙结构指数和残余油饱和度￣束缚水饱和度定量预测模型。将油水相渗曲线标准化后，利用相渗端点标定技术建立了考虑束缚水饱和度和残余油饱和度的数值模拟新方法。研究表明，濮城沙三中6—10油藏这2个预测模型的计算值与实验值之间相关性好，新方法能够表征每一个网格的束缚水饱和度和初始含油饱和度随储层物性的变化，可以更清晰地刻画油藏水驱开发后可动用剩余油的局部富集现象。在较少参数调整的条件下，历史拟合研究可以达到更高的精度。该成果能为同类型油藏数值模拟及剩余油研究提供借鉴。

The variation range of maximum mercury injection saturation and residual mercury saturation of 6-10 reservoir of middle Es3 in Pucheng is large, which reflects the strong heterogeneity of the relative permeability endpoint in the reservoir. Under the condition of few relative permeability experiments, the mercury injection curve and the statistical analysis method are used to establish the quantitative prediction model between irreducible water saturation and pore structure index and the quantitative prediction model between residual oil saturation and irreducible water saturation. After the oil-water relative permeability curve is standardized, a new numerical simulation method considering irreducible water saturation and residual oil saturation is established by using the relative permeability endpoint calibration technique. The results show that there is a good correlation between the calculated values and the experimental values of the two prediction model of 6-10 reservoir of middle Es3 in Pucheng. The new method can characterize the irreducible water saturation and initial oil saturation changing with reservoir physical properties in each grid, and can more clearly depict the local enrichment phenomenon of movable residual oil after water drive development. In the research of history fitting, higher fitting accuracy can be achieved under the condition of less parameter adjustment. The research results can provide reference for the numerical simulation of the same type of reservoir and the study of remaining oil.

10.6056/dkyqt202201013