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《Journal of Northeast Petroleum University》 2017-06
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Application of low-pressure gas adsorption experiment to characterizing pore structure of the shale

Zhu Hanqing;Jia Ailin;Wei Yunsheng;Jia Chengye;Jin Yiqiu;Research Institute of Petroleum Exploration and Development;  
The pore structure of shales has a significant impact on gas adsorption and migration. This study combined field emission scanning electron microscopy( FE-SEM),low-pressure CO2 and Ar adsorption to investigate the pore structure of lower Silurian Longmaxi organic-rich shale samples in Changning demonstration zone,southern Sichuan basin. The result shows that the Longmaxi organic-rich shales are dominated by organic matter pores along with fewer intraparticle pores and interparticle pores. The pore structure of the shales is heterogeneous.The average specific surface area of the shale samples is 42. 19 m2/g,with the average pore volume of 0. 059 1 cm3/g. The micropores less than 2 nm account for above 60% of the total specific surface area,which provide most of adsorption sites for shale gas. The mesopores and macropores more than 10 nm accounts for above 70%of the total pore volume,which provide most of storage space for shale gas. The experiment used in this paper realized the quantitative characterization of nano-pore distribution in shales,and the findings have great significance in understanding the characteristics of nano-pore structure and evaluating gas-containing property of organic-rich shales.
【Fund】: 国家科技重大专项(2017ZX05037-002)
【CateGory Index】: TE311
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