【作者】 徐勇； 吕成福； 陈国俊； 仲佳爱； 杨巍； 薛莲花；

【Author】 Xu Yong;Lu Chengfu;Chen Guojun;Zhong Jiaai;Yang Wei;Xue Lianhua;Key Laboratory of Petroleum Resources,Gansu Province,Key Laboratory of Petroleum Resources Research,Institute of Geology and Geophysics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;

【机构】 甘肃省油气资源研究重点实验室/中国科学院油气资源研究重点实验室； 中国科学院大学；

【摘要】 基于低温氮气吸附分形几何学研究方法,对川东南龙马溪组页岩储层进行了孔隙分形特征研究,并运用分形FHH模型计算了孔隙分形维数,讨论了分形维数与孔隙结构、有机碳含量、页岩矿物成分之间的关系。研究表明:川东南龙马溪组页岩以中孔为主,孔隙内部特征以墨水瓶状孔和狭缝状孔为主;页岩样品分形维数为2.629 2~2.898 0,反映了页岩孔隙结构复杂和非均质性强的特征;页岩平均孔径越小、微小孔隙越多,孔隙结构越复杂,孔表面越不规则,比表面积和分形维数则越大;有机碳含量和微孔发育程度对分形维数影响较大。通过分形维数可定量描述孔隙结构的复杂程度和不均一性,为研究页岩孔隙结构的分布特征提供了思路。更多还原

【Abstract】 Based on fractal theory and methods and the nitrogen adsorption results of shale samples from the Lower Silurian Longmaxi Formation in southeast Sichuan Basin,the fractal characteristics of pores were studied,the fractal dimension was calculated by using the fractal Frenkel-Halsey-Hill(FHH) model,and the relations of fractal dimension with pore structure,organic carbon content and shale composition were discussed.The results show that mesopores are the main pores in shale,and mainly consist of ink-bottle-like and slit-shaped pore.The fractal dimension of shale samples is between 2.629 2 and 2.898 0,which reflects the complexity and heterogeneity of the shale porosity.The smaller the average pore diameter is,the more the micropores are,the more complex the pore structure is,the more irregular the specific shale face is,the larger the specific surface face is,and the higher the fractal dimension is.Organic carbon content and the degree of micropore development impact a lot on the fractal dimension.更多还原