煤田地质与勘探2018，Vol.46Issue(1)：78-85,8.DOI:10.3969/j.issn.1001-1986.2018.01.014
宁武盆地山西组过渡相页岩孔隙特征及影响因素
Analysis on characteristics and influence factors of transitional facies shale pore in Ningwu basin
摘要
Abstract
In order to study the pore characteristics and influence factors of transitional facies shale in Shanxi Formation of Ningwu basin,the shale in Shanxi Formation was systematically sampled to carry out the SEM analysis,low temperature nitrogen adsorption experiment,TOC content test,maturity(Rmax) test,the whole rock mineral X diffraction analysis and porosity test,then the pore types,pore characteristics and influencing factors are discussed.The results show that pores in transitional shale of Shanxi Formation mainly consist of intergranular pores,intercrystalline pores,organic matter pores,organic matter primary pores and dissolution pores and fractures.The pore radius is primarily between 2 nm to 50 nm,and the shapes of the pores inclue open-wedge pores,parallel-plate pores,conical tube pores,ink bottle pores,etc.The average porosity of the shale is 3.64％,the average pore radius is 7.78 nm,the average BET surface area is 11.70 m2/g,and the average total pore volume is 0.0222 cm3/g,indicating a strong storage and adsorption.The shale pores have obvious fractal characteristics,and the fractal dimension is 2.61～2.77,which is positively correlated with the percentage of micropore volume;the shale pore development is influenced by TOC content,maturity(Rmax)and mineral composition.关键词
宁武盆地/过渡相/页岩气/孔隙特征/影响因素Key words
Ningwu basin/transitional facies/shale gas/pore characteristics/influence factors引用本文复制引用
魏建光,唐书恒,张松航,孙彩蓉,张廷强,龚明辉..宁武盆地山西组过渡相页岩孔隙特征及影响因素[J].煤田地质与勘探,2018,46(1):78-85,8.基金项目
国家自然科学基金项目(41272176)National Natural Science Foundation of China(41272176) （41272176）
