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岩石网络模型的构建是实现微观渗流实验和模拟研究有机结合的关键技术之一.提出了基于CT扫描图像的三维网络模型的构建方法.借助工业用微焦点CT系统,获取一系列的能够真实描述岩石的微观孔隙结构和流体分布的CT切片图像.在提取孔隙空间骨架、喉道信息以及孔隙信息的基础上建立相应的网络模型,实现CT三维图像信息向孔隙/喉道大小分布以及拓扑信息的转化.这种方法的特点在于能够在保持几何学特征和流动特征不变的情况下用简单的几何形状的孔隙和喉道来表征岩石内复杂的孔隙空间.将水驱和聚合物驱CT实验与网络模拟结果对比,所建三维网络模型计算参数与室内实验获得的孔隙度、绝对渗透率、相渗曲线和微观剩余油分布等结果吻合较好,表明该网络模型能很好地表征岩石微观的孔喉尺寸和拓扑性质.
The construction of rock network model is one of the key technologies to realize the combination of microscopic seepage experiment and simulation research.A method of constructing three-dimensional network model based on CT scanning image is proposed.With industrial micro-focus CT system, a series of real- Rock microcosmic pore structure and fluid distribution CT slice image.According to the skeleton of pore space, the throat information and the pore information, a corresponding network model is established to realize the three-dimensional CT image information to the pore / throat size distribution and topological information This method is characterized by the ability to characterize the complex pore spaces in the rock with simple geometric shapes of pores and throats while maintaining the geometric and fluid characteristics of the same.Water driven and polymer flooded CT experiments Compared with the network simulation results, the calculated parameters of the three-dimensional network model built in the experiment agree well with the porosity, absolute permeability, phase-permeability curve and microscopic residual oil distribution obtained from laboratory experiments, indicating that the network model can well characterize the microstructure of the rock Pore throat size and topological properties.