鄂尔多斯盆地东缘海陆过渡相页岩孔隙结构定量化表征
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摘要
为定量化表征鄂尔多斯盆地东缘太原组海陆过渡相页岩孔隙结构复杂程度,对5件页岩进行了低温液氮吸附等实验测试,应用FHH模型计算了分形维数并讨论了其影响因素。依据孔径大小可以将分形维数划分为2个阶段(孔径≥4nm和孔征<4mm),结果表明:页岩样品孔隙呈现出较强的分形特征。1)孔径≥4nm时的孔隙分形维数D2高于孔径<4nm时的孔隙分形维数D1;大孔径孔隙类型与形态多样,孔隙复杂程度更高。2)分形维数D1随微孔、介孔比例及黏土矿物质量分数增加而呈现出增大趋势,随BET比表面积、平均孔径、脆性矿物质量分数、宏孔比例、TOC增加呈现减小趋势,随镜质体反射率(Ro)增大呈现出先增大后减小趋势;D2随BET比表面积、平均孔径、宏孔比例、黏土矿物及脆性矿物质量分数的增加呈现出增大趋势,随微孔、介孔比例增加呈现出减小趋势,与TOC相关性差,随Ro增大呈现出先减小后增大的趋势。
To quantitative characterization of the east margin of Ordos basin from Taiyuan formation transition shale pore complexity,five shales have carried on the low temperature liquid nitrogen adsorption experiment,such as applying FHH model to calculate the fractal dimension and discuss their influencing factors.The results show that the pore shale samples show stronger fractal characteristic,based on the aperture size fractal dimension can be divided into two stages,more than 4 nm pore fractal dimension D2 and less than 4 nm pore fractal dimension D1,large diameter pore types and morphological diversity,higher pore complex.The fractal dimension D1 shows an increasing trend with the increase of micropore,mesoporous proportion and clay mineral content,a decreasing trend with the increase of BET specific surface area,average pore diameter,brittle mineral content,macropore ratio and TOC,and a first increasing and then decreasing trend with the increase of vitrinite reflectivity(Ro).With the increase of BET specific surface area,average pore diameter,macropore ratio,clay mineral content and brittle mineral content,D2 presents an increasing trend;with the increase of micropore and mesoporous proportion,D2 presents a decreasing trend,which is not correlated with TOC.With the increase of Ro,D2 first decreases and then increases.
To quantitative characterization of the east margin of Ordos basin from Taiyuan formation transition shale pore complexity,five shales have carried on the low temperature liquid nitrogen adsorption experiment,such as applying FHH model to calculate the fractal dimension and discuss their influencing factors.The results show that the pore shale samples show stronger fractal characteristic,based on the aperture size fractal dimension can be divided into two stages,more than 4 nm pore fractal dimension D2 and less than 4 nm pore fractal dimension D1,large diameter pore types and morphological diversity,higher pore complex.The fractal dimension D1 shows an increasing trend with the increase of micropore,mesoporous proportion and clay mineral content,a decreasing trend with the increase of BET specific surface area,average pore diameter,brittle mineral content,macropore ratio and TOC,and a first increasing and then decreasing trend with the increase of vitrinite reflectivity(Ro).With the increase of BET specific surface area,average pore diameter,macropore ratio,clay mineral content and brittle mineral content,D2 presents an increasing trend;with the increase of micropore and mesoporous proportion,D2 presents a decreasing trend,which is not correlated with TOC.With the increase of Ro,D2 first decreases and then increases.
引文
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[8]张宝鑫,王瑞瑞,傅雪海.霍西煤田太原组煤系灰岩孔隙分形特征对比研究[J].煤炭科学技术,2018,46(12):203-208.ZHANG Baoxin,WANG Ruirui,FU Xuehai.Comparison study on pore fractal features of coal measures limestone in Taiyuan formation of Huoxi coalfield[J].Coal Science and Technology,2018,46(12):203-208.(in Chinese)
[9]袁哲,刘鹏程,冯高城.分形维数定量表征煤岩储层非均质性[J].中国科技论文,2015,10(9):1010-1013.YUAN Zhe,LIU Pengcheng,FENG Gaocheng.Quantitatively characterizing the heterogeneity of coal deposits based on fractal dimension[J].China Sciencepaper,2015,10(9):1010-1013.(in Chinese)
[10]么玉鹏,姜波,李明,等.构造煤裂隙及渗流孔隙分形特征研究[J].煤矿安全,2016,47(8):5-8.YAO Yupeng,JIANG Bo,LI Ming,et al.Study on fracture and seepage pore fractal characteristics of tectonic coal[J].Safety in Coal Mines,2016,47(8):5-8.(in Chinese)
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[13]杨亚南,周世新,李靖,等.鄂尔多斯盆地南缘延长组烃源岩地球化学特征及油源对比[J].天然气地球科学,2017,28(4):550-565.YANG Yanan,ZHOU Shixin,LI Jing,et al.Geochemical characteristics of source rocks and oil-source correlation of Yanchang formation in southern Ordos basin,China[J].Natural Gas Geoscience,2017,28(4):550-565.(in Chinese)
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[17]任星民.鄂尔多斯盆地东缘中-新生代构造-热演化研究[D].南京:南京大学,2015.REN Xingmin.Mesozoic-Cenozoic tectonic-thermal geochronology of the eastern margin of the Ordos basin[D].Nanjing:Nanjing University,2015.(in Chinese)
[18]EVERETT D H,KOOPAL L K.International union of pure and applied chemistry[J].Polymer,2001,31(8):1598-1598.
[19]解德录,郭英海,赵迪斐.基于低温氮实验的页岩吸附孔分形特征[J].煤炭学报,2014,39(12):2466-2472.XIE Delu,GUO Yinghai,ZHAO Difei.Fractal characteristics of adsorption pore of shale based on low temperature nitrogen experiment[J].Journal of China Coal Society,2014,39(12):2466-2472.(in Chinese)
[20]熊健,刘向君,梁利喜.四川盆地富有机质页岩孔隙分形特征[J].断块油气田,2017,24(2):184-189.XIONG Jian,LIU Xiangjun,LIANG Lixi.Fractal characteristics of organic rich shale pore in Sichuan basin,China[J].Fault-Block Oil&Gas Field,2017,24(2):184-189.(in Chinese)
[21]王志伟,卢双舫,王民,等.湖相、海相泥页岩孔隙分形特征对比[J].岩性油气藏,2016,28(1):88-93.WANG Zhiwei,LU Shuangfang,WANG Min,et al.Fractal characteristics of lacustrine shale and marine shale[J].Lithologic Reservoirs,2016,28(1):88-93.(in Chinese)
[22]杨峰,宁正福,张世栋,等.基于氮气吸附实验的页岩孔隙结构表征[J].天然气工业,2013,33(4):135-140.YANG Feng,NING Zhengfu,ZHANG Shidong,et al.Characterization of pore structures in shales through nitrogen adsorption experiment[J].Natural Gas Industry,2013,33(4):135-140.(in Chinese)
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