基于CT扫描的低渗砂岩分形特征及孔渗参数预测

发布时间：2018-03-15 08:51

本文选题：低渗砂岩　切入点：CT图像　出处：《断块油气田》2017年05期 　论文类型：期刊论文

【摘要】：低渗砂岩孔喉狭小,结构复杂,难以进行岩石孔隙定量表征及物性参数的准确预测。为此,文中结合数字岩心技术及分形理论,提出了具有针对性的解决方法——选取四川盆地某气藏具有代表性的低渗砂岩岩样进行CT扫描,构建低渗砂岩微观结构图像和三维数字岩心,利用计盒维数方法分析低渗砂岩岩心孔隙空间的分形维数特征。结果表明:低渗砂岩孔隙空间具有良好的分形特征,利用分形理论可以描述其复杂的孔隙结构特征;通过建立岩石孔隙度、渗透率与孔隙空间分形维数的关系式,可有效预测该类低渗砂岩的孔渗参数,拓宽了分形理论在低渗储层物性评价中的应用范围。
[Abstract]:The pore throat of low permeability sandstone is narrow, the structure is complex, it is difficult to carry out quantitative characterization of rock pore and accurate prediction of physical parameters. Therefore, this paper combines digital core technology and fractal theory. In this paper, a specific solution is put forward: selecting a typical rock sample of low permeability sandstone in Sichuan Basin for CT scanning, constructing microstructural image of low permeability sandstone and 3D digital core. The box-counting dimension method is used to analyze the fractal dimension characteristics of pore space in low-permeability sandstone core. The results show that the pore space of low-permeability sandstone has good fractal characteristics, and the complex pore structure can be described by using fractal theory. By establishing the relationship between porosity, permeability and fractal dimension of pore space, the porosity and permeability parameters of this kind of low permeability sandstone can be predicted effectively, and the application range of fractal theory in physical property evaluation of low permeability reservoir is widened.
【作者单位】：中国石化西南油气分公司博士后科研工作站;中国石化西南油气分公司勘探开发研究院;
【基金】：国家科技重大专项课题“川西凹陷斜坡带复杂致密砂岩气藏开发关键技术”(2016ZX05048-004)
【分类号】：P618.13;TE31

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