基于流动单元的多油层储层参数计算和评价方法研究

Calculation and Evaluation Method of Reservoir Parameters in Multiple Oil Reservoirs Based on Flow Unit

针对英东地区含油储层井段长、非均质性严重、传统渗透率模型无法满足储层评价精度要求这一矛盾,在综合试油、MDT资料,深入分析油、气、水、干层测井响应特征的基础上,利用传统的流动带指数按照“单元化分类评价”的思路分地层对储层渗透率进行表征计算,并在此基础上建立电性参数下渗透率流动带指数计算模型。工区实际生产资料评价结果表明,利用流动带指数渗透率模型计算出的渗透率相对误差低于25%,绝对误差也能控制在半个数量级以内,其结果有效地提高了非均质储层渗透率预测精度,符合储层实际情况,能够满足油藏描述及生产的需要,对该地区后续长井段复杂储层非均质性研究和后期层间吸水矛盾治理具有一定的指导意义。

For the long oil-bearing section and high heterogeneity reservoir in Yingdong area,the conventional permeability model cannot meet the requirement of reservoir evaluation accuracy.Integrating the data of formation testing and MDT,the logging response features of oil,gas,water and dry layer are analyzed.We attempt to characterize the permeability fractions with the flow-band index,which characterizes the stratigraphy according to“unitized classification evaluation”.Meanwhile,we have established the calculation model of permeability flow-band index under electrical parameters.Evaluation results of actual production data in the study area show that the absolute error(of flow zone exponential permeability model)is basically controlled under half order of magnitude,and the relative errors are below 25%.The results improve significantly the prediction accuracy of heterogeneous reservoir permeability,and satisfy the actual reservoir conditions to meet the needs of reservoir description and production.This has an important guiding significance for heterogeneity studies and for enhancing interlayer water absorption contradiction of complex reservoirs.