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Characterization of full-sized pore structure and fractal characteristics of marine-continental transitional Longtan formation shale of Sichuan Basin, South China Jizhen Zhang, Xianqing Li, Qiang Wei, Kexin Sun, Guangwu Zhang, and Feiyu Wang Energy Fuels, Just Accepted Manuscript • DOI: 10.1021/acs.energyfuels.7b01456 • Publication Date (Web): 04 Sep 2017 Downloaded from http://pubs.acs.org on September 8, 2017
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Energy & Fuels
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Characterization of full-sized pore structure and fractal characteristics of
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marine-continental transitional Longtan formation shale of Sichuan
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Basin, South China
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Jizhen Zhang a,b, Xianqing Li a,b,*, Qiang Wei a,b , Kexin Sun a,b, Guangwu Zhang c,
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Feiyu Wang d,e State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology(Beijing)，
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a
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Beijing 100083, P. R. China
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b
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P. R. China
College of Geosciences and Surveying Engineering, China University of Technology ( Beijing ), Beijing 100083,
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c
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R. China
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d
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102249, P. R. China
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e
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* Corresponding author at: China University of Mining and Technology (Beijing), D11, Xueyuan Road, Haidian
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District, Beijing, P. R. China.
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Tel.: +8610 62331854-8131, +8610 1355287755; fax: +8610 62339208.
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E-mail address:
[email protected] (X. Li)
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HI GHLI GHTS
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·Pore types and morphology of marine-continental transitional shales were investigated using FE-SEM.
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·The MIP and N2 /CO2 GA techniques were combined for quantitative characterization of full-sized pores.
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·Micropores provide the dominant SSAs, whereas micropores and macropores occupy the majority of PV.
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·Fractal characteristics of Longtan shales were investigated by FHH model based on N2 GA data.
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·Correlation among petrological component, pore structure parameters and fractal dimensions were analyzed.
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ABBREVIATIONS
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PV= pore volume
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SSA= specific surface area
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PSD= pore size
Langfang Branch, Research Institute of Petroleum Exploration & Development, PetroChina, Langfang 065007, P.
State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, P. R. China
ACS Paragon Plus Environment
Energy & Fuels
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IUPAC= International Union of Pure and Applied Chemistry
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TEM=transmission electron microscopy
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FIB–SEM =focused ion beam scanning electron microscopy
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FE–SEM= field emission scanning electron microscopy
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SEM= scanning electron microscopy
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MIP= mercury intrusion porosimetry
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GA =gas adsorption
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USANS= ultra-small-angle neutron scattering
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SANS=small-angle neutron scattering
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D-A= Dubinin–Astakhov
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DFT= density functional theory
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D-R= Dubinin–Radush
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BJH= Barrett–Joyner–Halenda
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BET= Brunauer–Emmett–Teller
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Fm= Formation
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FHH= Frenkel–Halsey–Hill
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BCPCA =Beijing Center for Physical and Chemical Analysis of China
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XRD= X-ray diffraction
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VDW=Van der Waals' force
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ABSTACT: Despite the recent significant progress reviewed in marine and continental shale gas reservoirs, there
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is no generally investigation concerning marine-continental transitional shales, especially in the research of the
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pore structure and fractal characteristics of marine-continental shale reservoirs. In this study, the pore structure
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characteristics of twelve typical marine-continental transitional shale samples of the Upper Permian Longtan
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Formation collected from Southern Sichuan Basin were analyzed, combining techniques of TOC content
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determination, X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), high pressure
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mercury intrusion porosimetry (MIP), and low-pressure N2/CO2 adsorption. And the pore fractal characteristics of
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shales were also analyzed using FHH model with N2 adsorption data. Not only the effects of TOC content and
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mineralogical compositions for pore structure parameters and fractal dimensions were analyzed, but also the
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relationships between pore structure parameters and fractal dimensions were discussed. The results showed that,
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the macropores (>50nm) mainly develop within or between clay minerals, while the micropores (
