一种砂砾岩介质岩心表征的新方法

针对纵向非均质性严重的砂砾岩油藏，基于典型的分层砂砾岩图像，在不同层位选取代表性的岩心薄片分别构建相应的三维数字岩心，采用合并法构建砂砾岩数字岩心，并提取相应的孔隙网络模型，采用常规法构建相应的砂砾岩孔隙网络模型，对常规法和合并法得到的孔隙网络模型结构特征和渗透率特征进行对比分析。分析结果表明，合并法构建的砂砾岩孔隙网络模型能够描述其孔隙结构特征，且能有效地描述出砂岩介质在横向和纵向渗透率的差异特征，可为砂砾岩油藏岩心的精确表征及渗流机制的分析提供一套有效地研究思路。

A new method for rock core characterization in sandy conglomerate media

There is strong vertical heterogeneity in sandy conglomerate reservoir. In this paper, based on typical layered sandy conglomerate image, representative core slices of different layers are chosen and the corresponding digital rocks are reconstructed respectively. Then, mergence method is developed to construct the sandy conglomerate digital rock core and the corresponding pore network model is extracted. Meanwhile, traditional method is used to construct the corresponding pore network model. At last, the structures and permeability characteristics of sandy conglomerate pore network models obtained from above two methods are compared and analyzed. The results show that the sandy conglomerate pore network model with mergence method could effectively describe the pore structure characteristics; and it also can describe the horizontal and vertical permeability differences effectively, so as to provide an effective way for the rock core characterization and flow mechanism analysis in sandy conglomerate reservoir.