基于岩心渗流能力约束的砂砾岩储层分类方法研究

Classification method for glutenite reservoirs based on core seepage capacity constraints

连续的储层分类结果是油藏开发方案编制及储层改造的重要依据。海上油田测井资料匮乏,并且因采用单层测试造成生产资料少,故非均质砂砾岩储层分类存在困难。首先结合渗流能力法和图版法储层分类的优势,在不同类型砂砾岩岩心物性分析的基础上,按渗流能力对取心井段储层进行分类;然后选取敏感测井曲线构建储集元素和渗流元素并建立储层指示因子;最后利用岩心渗流能力分类结果约束储层指示因子,建立基于常规测井曲线的储层分类标准。该储层分类方法在渤海海域C油田东三段砂砾岩储层的实际应用结果表明,其储层分类结果与岩心渗流能力分类结果吻合度较高,且与核磁共振测井反映的孔隙结构特征及生产测井结果均具有良好的一致性,解决了海上油田储层分类难度大的问题,实现了砂砾岩储层纵向和横向上的连续分类,为海上油田高效开发提供了技术支持。

E 3d 3(the third member of the Dongying Formation)in oilfield C,Bohai Sea area consists of near-source fan-delta glutenite-bearing deposits with high heterogeneity.Continuous reservoir classification results are important for development planning and reservoir stimulation.The lack of log data and single-layer test or production data in offshore oil fields makes it difficult to classify heterogeneous glutenite reservoirs.We combine the advantages of the seepage capacity method and chart method for reservoir classification.Firstly,reservoir classification is performed in terms of seepage capacity based on the analysis of the petrophysical properties of different types of glutenite cores.Then,sensitive log curves are selected to construct reservoir elements and seepage elements and establish reservoir indicators.Finally,core-based seepage capacity classification results are used to constrain reservoir indicators,and reservoir classification standards based on the log curves are established.The results of application to oilfield C in Bohai Sea area agree well with core-based classification as well as NMR-indicated pore structure and production log data.This study solves the problem of insufficient testing and production data for reservoir classification in offshore oil fields.Continuous vertical and horizontal classification of glutenite reservoirs provides technical support to efficient development of offshore oil fields.