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The Characteristics of Pore Structure and Its Gas Storage Capability of the Lower Cambrian Shales from Northern Guizhou Province

XIA Jia,WANG Si-bo,CAO Tao-tao,YANG Jin-zhao,SONG Zhi-guang   

  1. 1.State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of
    Sciences,Guangzhou 510640,China;2.University of Chinese Academy of Sciences,Beijing 100049,China;
    3.Wuxi Department of Petroleum Geology,Research of Petroleum Exploration and Development,SINOPEC,Wuxi 214126,China
  • Received:2015-03-24 Revised:2015-06-02 Online:2015-09-10 Published:2015-09-10

Abstract:

The organic carbon content,mineral compositions,pore structures and sorption capacity of core samples from the Lower Cambrian Niutitang Formation and Palang Formation in northern Guizhou Province were analyzed to obtain the pore structure characteristics,pore structure controlling factors and the impact of organic matter on methane sorption capacity.The results show that the study section is a tight reservoir with characteristics of low porosity and permeability.The samples have a BET surface area ranging from 5.64m2/g to 28.29m2/g and the NLDFT micropore volume and mesopore volume in the range of 0.02-0.54cm3/100g and 0.53-3.38cm3/100g,respectively.The positive relationships between porosity,specific surface area,micropore volume and TOC content indicate that organic matter controls the pore structures.However,shales with high TOC content may have certain limitation on the development of organic matter pores.In addition,clays also contribute a portion of total porosity.The methane excess sorption at 12MPa(nex12MPa)and Langmuir sorption capacity(nL)of the Lower Cambrian shales range from 0.30cm3/g to 3.71cm3/g rock and 0.41cm3/g to 4.22cm3/g rock,respectively.The methane sorption capacity shows a positive correlation with TOC but a decrease in high TOC samples because of low micropore volume and specific surface area.

Key words: Porosity, Specific surface area, Micropore volume, Total organic carbon, Methane sorption capacity, Lower Cambrian shale in northern Guizhou Province

CLC Number: 

  • TE132.3

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