摘要
通过CT扫描成像技术,研究了碳酸盐岩芯的孔隙度分布,采用孔隙度分布参数和孔隙度分布统计曲线定量表征孔隙度的分布特征。应用CT扫描成像技术,进行干岩芯和饱和地层水岩芯扫描,研究了岩芯不同扫描层面和岩芯整体孔隙度分布特征。利用孔隙度数字矩阵,重建了岩芯不同扫描层面、沿某正交切面、三维孔隙度分布图。选用7种参数对岩芯孔隙度分布集中趋势、离散程度和分布形态进行表征,应用孔隙度频率分布曲线得到了岩芯孔隙度分布的统计特征。研究实例表明,该碳酸盐岩芯为孔隙-溶洞型,应用上述评价方法可以实现对岩芯孔隙度分布特征的定量表征。
The porosity distribution of carbonate core can be observed using x-ray CT. The purposes of this paper were to present the classification for studying the porosity of carbonate core, and to quantitatively characterize porosity distribution features. By scanning dry core and the core saturated with formation wa ter, the porosity distribution features of each scanning slice and the whole core were obtained, and the porosity distribution images of each slice, orthogonal and three dimensional were reconstructed. Seven parameters were selected to characterize the central tendency, dispersion and distributional patterns of porosity distribution. Statistical features of core porosity distribution could be derived from frequency distribution curves of porosity. Based on the theories and methods above, the porosity of carbonate core was matix pore-dissolved cavity type and its porosity distribution features were obtained.
出处
《西部探矿工程》
CAS
2010年第4期36-39,共4页
West-China Exploration Engineering
基金
中国石油天然气股份公司"油层物理与渗流力学重点实验室"项目(06-02C-01-02-01)
关键词
CT成像
碳酸盐岩
孔隙度分布
表征方法
CT scanning image
carbonate core
porosity distribution
characterization method
