Micro-Nano Pore Structure Characteristics in the Lower Cambrian Niutitang Shale, Northeast Chongqing
Wang Pengfei
Jiang Zhenxue
Li Zhuo
Chen Lei
Wang Guozhen
Huang Pu
Yin Lishi
Abstract：Lower Cambrian Niututang Formation shale in south China is one of the main target zones for shale gas exploration.However, the exploration of shale in northeastern Chongqing is not satisfactory as the pore structure of the shale is unclear.This study examined pores in shale samples from the Niutitang Formation using focused ion-beam scanning electron microscopy, nano-CT, and gas adsorption analysis.Results show that pores in Niutitang shale are rare and have small diameters and poor connectivity.Most Niutitang-shale pores are inorganic pores, including intraparticle and intergranular pores.N2 adsorption hysteresis loop of Niutitang shale belongs to type H4 corresponding to narrow slit pore.The average total pore volume of the Niutitang shale is 0.0317mL/g, and the average total surface area is 34.57m2/g.Over-high thermal evolution degree resulting small number of organic pores and poor connectivity of micro-nano pores in Niutitang shale.Mesopores contributed most of the pore volume and micropores contributed more pore surface area than that of mesopores.
Keywords：northeast Chongqinglower Cambrianthe Niutitang shalepore structurepetroleum geology.
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1147-1156 )