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    Nanopore structure comparison between shale oil and shale gas: examples from the Bakken and Longmaxi Formations

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    Authors
    Liu, K.
    Wang, L.
    Ostadhassan, M.
    Zou, J.
    Bubach, B.
    Rezaee, M. Reza
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Liu, K. and Wang, L. and Ostadhassan, M. and Zou, J. and Bubach, B. and Rezaee, M.R. 2019. Nanopore structure comparison between shale oil and shale gas: examples from the Bakken and Longmaxi Formations. Petroleum Science. 16 (1): pp. 77–93.
    Source Title
    Petroleum Science
    DOI
    10.1007/s12182-018-0277-3
    ISSN
    1672-5107
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/71828
    Collection
    • Curtin Research Publications
    Abstract

    © 2018, The Author(s). In order to analyze and compare the differences in pore structures between shale gas and shale oil formations, a few samples from the Longmaxi and Bakken Formations were collected and studied using X-ray diffraction, LECO TOC measurement, gas adsorption and field-emission scanning electron microscope. The results show that samples from the Bakken Formation have a higher TOC than those from the Longmaxi Formation. The Longmaxi Formation has higher micropore volume and larger micropore surface area and exhibited a smaller average distribution of microsize pores compared to the Bakken Formation. Both formations have similar meso-macropore volume. The Longmaxi Formation has a much larger meso-macropore surface area, which is corresponding to a smaller average meso-macropore size. CO2 adsorption data processing shows that the pore size of the majority of the micropores in the samples from the Longmaxi Formation is less than 1 nm, while the pore size of the most of the micropores in the samples from the Bakken Formation is larger than 1 nm. Both formations have the same number of pore clusters in the 2–20 nm range, but the Bakken Formation has two additional pore size groups with mean pore size diameters larger than 20 nm. Multifractal analysis of pore size distribution curves that was derived from gas adsorption indicates that the samples from the Longmaxi Formation have more significant micropore heterogeneity and less meso-macropore heterogeneity. Abundant micropores as well as meso-macropores exist in the organic matter in the Longmaxi Formation, while the organic matter of the Bakken Formation hosts mainly micropores.

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