为评价砂岩人造岩心与天然岩心在岩性、物性、渗透性、孔隙和敏感特性等方面的区别,进行了X衍射、普通薄片、扫描电镜、铸体薄片、压汞法、敏感性分析等实验.结果表明:通过X衍射分析得到的人造岩心岩性参数和镜下观察到的矿物与天然岩心岩性矿物类型相同,含量接近；人造岩心和天然岩心的渗透率、孔隙度等主要物性参数和汞饱和度、平均孔隙半径、分选系数、结构系数等孔隙参数均接近；人造岩心与天然岩心颗粒大小、岩石结构、孔喉分布及孔隙与喉道连通关系比较接近；人造岩心和天然岩心均无速敏现象,水敏指数均为50％～ 70％,属于中等偏强水敏.研制的砂岩人造岩心具有天然岩心的特性,且外观完好.%In order to evaluate the comparisons in the lithology, physical properties, permeability, porosity, sensitivity and other characteristics for both artificial and native cores of sandstone, the experiments such as X-ray diffraction , ordinary slice, scanning electronic microscope, cast slice, mercury injection, sensitivity analyses and so on are conducted. The results show that both the lithologic parameters obtained from the analysis of X-ray diffraction and the minerals observed under the microscope are as same as the types of lithological minerals of the native cores, and moreover their contents are close; the main physical properties such as permeability, porosity and so on are all similar to the pore parameters including Hg injection saturation, average pore radius, sorting coefficient, structure coefficient and so forth for both artificial and native cores; and furthermore there are other similar characteristic : for instance, particle size, rock structure, pore throat distribution and their connectivity between these two kinds of cores; there is no velocity sensitivity phenomenon for the both, and their water-sensitive indexes are from 50% to 70% , belonging to medium to strong degree. The developed artificial sandstone cores possess the characteristics of native cores and moreover have intact and perfect appearances.
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