Volume 46 Issue 1
Feb.  2018
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WEI Jianguang, TANG Shuheng, ZHANG Songhang, SUN Cairong, ZHANG Tingqiang, GONG Minghui. Analysis on characteristics and influence factors of transitional facies shale pore in Ningwu basin[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(1): 78-85. DOI: 10.3969/j.issn.1001-1986.2018.01.014
Citation: WEI Jianguang, TANG Shuheng, ZHANG Songhang, SUN Cairong, ZHANG Tingqiang, GONG Minghui. Analysis on characteristics and influence factors of transitional facies shale pore in Ningwu basin[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(1): 78-85. DOI: 10.3969/j.issn.1001-1986.2018.01.014
shu

Analysis on characteristics and influence factors of transitional facies shale pore in Ningwu basin

  • School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China

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National Natural Science Foundation of China(41272176)

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  • Received Date: March 05, 2017
  • Published Date: February 24, 2018
    Graphical Abstract
    • 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.
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